tag:blogger.com,1999:blog-4818325700953522762024-03-14T06:21:10.348-07:00Networking (Concepts,Knowledge and Experience)ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.comBlogger19125tag:blogger.com,1999:blog-481832570095352276.post-83412330083542134862016-10-03T06:38:00.001-07:002016-11-08T21:45:28.496-08:00My Udemy Courses <div dir="ltr" style="text-align: left;" trbidi="on">
Hi Guys<br />
<br />
I am creating this post where you can get the discount coupons on all of my Udemy Courses under one place.<br />
<br />
I am glad to announce that i am having 3 full courses under my professional courses. And will soon start working on my fourth course.<br />
<br />
You can all save this page link for your future reference , as i will be updating my coupon codes on this page.<br />
<br />
November month sale is here , i have created 20 free coupons for each course , go through the links and grab the offer fast!!!!<br />
<br />
<a href="https://www.udemy.com/cisco_waas_wide_area_application_services/?couponCode=NOV_SALE" target="_blank">Cisco WAAS</a><br />
<br />
<a href="https://www.udemy.com/ccie-v5-technology-focused-lab-ospf/?couponCode=NOV_SALE" target="_blank">CCIE v5 Technology Focused Lab : OSPF</a><br />
<br />
<a href="https://www.udemy.com/cciev5-technology-focused-lab-eigrp/?couponCode=NOV_SALE" target="_blank">CCIE v5 Technology Focused Lab : EIGRP ..</a></div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-69602981356067287032015-12-16T11:32:00.001-08:002015-12-16T11:33:31.133-08:00OSPF Basics<div dir="ltr" style="text-align: left;" trbidi="on">
Hi Guys ,<br />
<br />
After a good success of my EIGRP and Cisco WAAS course , I have started my recording on OSPF for CCIEv5 .<br />
<br />
Here is the my first video .<br />
Mail or message me for discount coupons for OSPF<br />
<br />
Cheers Njoy!!!<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen="" class="YOUTUBE-iframe-video" data-thumbnail-src="https://i.ytimg.com/vi/btrLTTou74U/0.jpg" frameborder="0" height="266" src="https://www.youtube.com/embed/btrLTTou74U?feature=player_embedded" width="320"></iframe></div>
<br /></div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-23447806526939857452015-10-08T10:06:00.002-07:002015-10-08T10:06:33.466-07:00Application Traffic Policies (Cisco WAAS)<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-size: small;"><b><span lang="EN-US">Application
Traffic Policies</span></b><span lang="EN-US"><o:p></o:p></span></span></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l2 level1 lfo1; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Policy that defines Cisco WAVE
behavior for specific traffic types.</span></span></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l2 level1 lfo1; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Configure ATPs for individual Cisco
WAVEs, or globally through the Cisco WAAS Central Manager.</span></span></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l2 level1 lfo1; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Register the Cisco WAVEs in the
topology with Central Manager.</span><span lang="EN-US"> </span></span></div>
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<b><span lang="EN-US"><span style="font-size: small;">Application
Definition<o:p></o:p></span></span></b></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l0 level1 lfo2; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Logical grouping of traffic types.</span></span></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l0 level1 lfo2; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Enable monitoring on an application
group.</span></span></div>
<div class="MsoNormal" style="margin-left: 36.0pt; mso-list: l0 level1 lfo2; tab-stops: list 36.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Globally configure application
definitions in Central Mana.ger </span></span></div>
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<b><span lang="EN-US"><span style="font-size: small;">Traffic
Classifier<o:p></o:p></span></span></b></div>
<div class="MsoNormal" style="margin-left: 72.0pt; mso-list: l1 level2 lfo3; tab-stops: list 72.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">The traffic classifier is used </span><span lang="EN-US"> </span><span lang="EN-US">to identify a connection as</span><span lang="EN-US"> </span><span lang="EN-US"> a specific type.</span></span></div>
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<div class="MsoNormal" style="margin-left: 72.0pt; mso-list: l3 level2 lfo4; tab-stops: list 72.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Actions are taken against</span><span lang="EN-US"> </span><span lang="EN-US"> the classifier based on the</span><span lang="EN-US"> </span><span lang="EN-US">configured
policy map.</span></span></div>
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<b><span lang="EN-US"><span style="font-size: small;">Policy
Map<o:p></o:p></span></span></b></div>
<div class="MsoNormal" style="margin-left: 72.0pt; mso-list: l0 level2 lfo1; tab-stops: list 72.0pt; text-indent: -18.0pt;">
<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">A policy map has two primary
functions:</span></span></div>
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<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;">
</span></span><!--[endif]--><span lang="EN-US">It
associates a traffic classifier to an application definition for reporting
purposes.</span></span></div>
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<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;">
</span></span><!--[endif]--><span lang="EN-US">It
assigns an action to be taken against traffic that matches a traffic
classifier.</span></span></div>
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<!--[if !supportLists]--><span style="font-size: small;"><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman'; font-stretch: normal; font-weight: normal;"> </span></span><!--[endif]--><span lang="EN-US">Policy maps are applied based on
their ordering within Central Manager or on </span><span lang="EN-US"> </span><span lang="EN-US">the device itself.</span></span></div>
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<b><span lang="EN-US"><span style="font-size: small;">Default
Application Policy Logic</span><o:p></o:p></span></b></div>
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<b><span lang="EN-US"><span style="font-size: small;">Default
Application Policy Acceleration</span><o:p></o:p></span></b></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeTIub7VrXG0H3g423wxtPvEBZP3c989qqxVzTDA-4E4egveEAuER3wze9Y9giC_JOr4P7bCViZYP-9qoofavOzNLfGEfQUTj59t4PqbigUf8U-gIhd9XCx4qUXuHCmBYDYCJXnVqxyP4/s1600/Capture2.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="176" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeTIub7VrXG0H3g423wxtPvEBZP3c989qqxVzTDA-4E4egveEAuER3wze9Y9giC_JOr4P7bCViZYP-9qoofavOzNLfGEfQUTj59t4PqbigUf8U-gIhd9XCx4qUXuHCmBYDYCJXnVqxyP4/s320/Capture2.PNG" width="320" /></a></div>
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<div class="MsoNormal">
<b><span lang="EN-US"><span style="font-size: small;">For more info on Cisco WAAS , you can take my complete course of Cisco WAAS on Udemy</span></span></b></div>
<div class="MsoNormal">
<b><span lang="EN-US"><span style="font-size: small;"><a href="https://www.udemy.com/cisco_waas_wide_area_application_services/" target="_blank">Click to watch demo , mail me for discount coupons </a></span></span></b></div>
</h2>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-11667924997326552092015-08-08T05:26:00.001-07:002015-08-26T22:02:14.156-07:00EIGRP as per CCIE (RnS) V5 and a Complete technology focused LAB is live on Udemy...<div dir="ltr" style="text-align: left;" trbidi="on">
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<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dz5y0Qs9XkcELH3Dhj8SEJ9qlaNG1vleCNRhfrVwK0x_s0ms-By6sPL6fpakX_rL1ujhPE1RP-Beik5RAL84g' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div>
HI Guys,<br />
<br />
My new course on EIGRP as per CCIE (RnS) V5 and a Complete technology focused LAB is live on udemy .<br />
<br />
<a href="https://www.udemy.com/cciev5-technology-focused-lab-eigrp" target="_blank">https://www.udemy.com/cciev5-technology-focused-lab-eigrp</a><br />
<br />
PFB the coupon codes ..hurry up each coupon codes valid for 10 users Grab it.<br />
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Cheers!!!<br />
Have a Good Day..<br />
<br />
<br />
<br /></div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-5474864727129328192015-06-20T02:20:00.001-07:002015-06-23T05:09:28.671-07:00Cisco WAAS full course series is now live on Udemy <div dir="ltr" style="text-align: left;" trbidi="on">
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<br />
<br />
Hi Friends ,<br />
<br />
After so much of hard work and late night sleeps , complete series of my Cisco WAAS videos is live on Udemy .<br />
I have got lot of feedback regarding the course material that you all want , i tried my level best to accommodate all those in a whole series of WAAS which is more than 3 hours.<br />
<br />
Super discount is going on(just 4$) 20 coupons available , Grab it before it get expire <br />
<a href="https://www.udemy.com/cisco_waas_wide_area_application_services/?couponCode=Grab_it_super_discount">Grab this Super offer..!!!</a><br />
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<br /></div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-86559950093964268122014-07-18T04:25:00.000-07:002014-09-10T01:45:56.195-07:00A different approach <div dir="ltr" style="text-align: left;" trbidi="on">
Hi friends , after taking alot of batches for CCNA , CCNP, special batches for MPLS , QOS ,BGP. I am planning to go online now , I am going to prepare the online classes , now the difference will be-<br />
<br />
Here i am not going to take only that regular CCNA CCNP batches but also i am planning to have specific classes , like some students came to me and say they want to learn in and out of switching not only which is there in CCNA or CCNP , some came who want to have complete BGP knowledge from CCNP level to CCIE level and many more like this , so i am planning to give the online classes depending upon your requirement . Or come to me with your difficulties we will arrange a special session as per the requirements <br />
<br />
Please post what you want know , i am planning to start from next month , as my CCNA+CCNP bootcamp is going on right now.<br />
<br />
Just to let you know all ,I have switched my Company now i am in British Telecom as a Technical Analyst . :)<br />
<br />
Waiting for your posts.....</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com4tag:blogger.com,1999:blog-481832570095352276.post-25927633936135325202014-06-02T15:15:00.001-07:002014-06-02T15:25:07.218-07:00WAAS Optimiation<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;">As you have always seen many application works very well when any one tries to access it from the LAN , but the same will respond slow when someone tries to access it over the WAN.</span><br />
<span style="font-size: large;">In this section we will see how WAAS helps to reduce the above issue and give the user the same feel as he/she is accessing it from the LAN .</span><br />
<span style="font-size: large;"><br /></span>
<span style="font-size: large;">WAAS have some optimization technique which it puts for each and every TCP session.</span><br />
<br />
<h4 style="text-align: left;">
<span style="font-size: large;">Transport flow optimization (TFO)</span></h4>
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<span style="font-family: Arial, Verdana, Helvetica, sans-serif; font-size: large;"><span style="background-color: white;"><br /></span></span></div>
<div style="text-indent: -6.71999979019165px;">
<span style="font-size: large;">There are barrier when data is carried by TCP over the WAN , you can think of TCP optimization with WAAS as a enabled proxy which shields communicating nodes from performance limiting WAN conditions(such as packet loss , latency etc), thereby increasing throughput.</span></div>
<div style="text-indent: -6.71999979019165px;">
<span style="font-size: large;">TFO enable the nodes to make use of WAN bandwidth more effectively and minimize the impact of TCP retransmissions.</span><br />
<span style="font-size: large;"><br /></span></div>
<div style="text-indent: -6.71999979019165px;">
<span style="font-size: large;">TFO provides following optimizations:-</span><br />
<span style="font-size: large;">1)<u>Large initial window</u>- We all know TCP grows from a slow start and then it goes to congestion avoidance phase , what if we reduce the slow start phase , yes we will mitigate the latency associated with initial connection setup , this is what TFO is : it increases the initial congestion window , which helps the connection to identify the bandwidth ceiling at a early stage and let the connection to enter into congestion avoidance phase rapidly.</span><br />
<span style="font-size: large;"><br /></span>
<span style="font-size: large;">2)<u>Selective Acknowledgement - </u> Before RFC 2018 there was no proper scheme like SAck , which in simple words is : if a block of data is lost or unacknowledged then the transmitting node will get to know and have to retransmit that block of data only . This will tremendously reduce the bandwidth consumption upon retransmission of lost segment .</span><br />
<span style="font-size: large;"><br /></span>
<span style="font-size: large;">3)<u>Windows Scaling</u> - Found in RFC 1323 , allows communicating nodes to have large window , which enable large amount of data to unack in the network at any time , which allows end nodes to better utilize the available bandwidth . </span><br />
<span style="font-size: large;"><br /></span>
<span style="font-size: large;">4)<u>Large Buffers</u> - The key point of this is to keep the WAN bandwidth with full of data , large TCP buffers on WAE allow to accomplish this. Also WAAS provide adaptive buffer allocation depending upon connection as compare to tedious static buffer allocation which results in inefficient memory allocation.</span><br />
<span style="font-size: large;"><br /></span>
<br />
<div style="text-indent: -12.479999542236328px;">
<span style="font-size: large;">5)<u>Advanced congestion handling</u>- Through intelligent handling of TCP message congestion scenarios, Cisco WAAS can more efficiently retransmit lost data when necessary and return to higher levels of throughput on the network much more quickly, resulting in better application performance .</span><br />
<span style="font-size: large;"><br /></span>
<br />
<h4 style="text-align: left;">
<span style="font-size: large;">Data redundancy elimination (DRE)</span></h4>
<span style="font-size: large;"><br /></span>
<span style="font-size: large;">What if there could be a mechanism which can see the bytes flying on the WAN and could generate some pattern for that ,and when the same byte have to fly will send the generated pattern only (which is very small in size as compare to those bytes) for that, which on the receiving end regenerate the same bytes which need to be fly ...This is amazing yes this is what DRE is....</span><br />
<span style="font-size: large;"><br /></span>
<br />
<h4 style="text-align: left;">
<span style="font-size: large;">Lempel-Ziv (LZ) compression</span></h4>
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<span style="font-family: Arial, Verdana, Helvetica, sans-serif; font-size: large;">LZ compression is a standards-based compression that can be applied to further reduce the amount of bandwidth consumed by a TCP flow. LZ compression can be used in conjunction with DRE or independently. LZ compression can provide from 2:1 to 4:1 compression, depending on the application being used and the data being transmitted. This feature is especially helpful for data that has not been previously seen and suppressed by DRE because the pattern identifiers are highly compressible.</span></div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-2603785485905353352014-05-25T02:03:00.000-07:002014-05-25T02:23:01.217-07:00WCCP Overview<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size: large;">WCCP is a transparent interception protocol first developed by Cisco Systems, Inc. in 1997. WCCP is a control plane protocol that runs between devices running Cisco IOS and WCCP "clients" such as WAAS. The protocol enables the network infrastructure to selectively intercept traffic based on IP protocol and port numbers, and redirect that traffic to a WCCP client. WCCP is considered transparent, because it allows for local interception and redirection of traffic without any configuration changes to the clients or servers. WCCP has built-in load-balancing, scalability, fault-tolerance, and service assurance (fail open) mechanisms</span></span><br />
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<span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size: large;">The current version, WCCPv2, is used by Cisco WAAS to transparently intercept and redirect all TCP traffic, regardless of port. The following section describes the basic WCCPv2 concepts and how they are specifically used by Cisco WAAS</span></span><br />
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<span style="font-size: large;">Service Groups</span></h4>
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<span style="font-size: large;">The routers and WAEs participating in the same service constitute a service group. A service group defines a set of characteristics about what types of traffic should be intercepted, as well as how the intercepted traffic should be handled. There are two types of service groups:</span></div>
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<li><span style="font-size: large;">Well-known services</span></li>
<li><span style="font-size: large;">Dynamic services</span></li>
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<span style="font-size: large;">Well-known services, also referred to as static services, have a fixed set of characteristics that are known by both IOS and WCCPv2 client devices. There is currently a single well-known service called web-cache. This service redirects all TCP traffic with a destination port of 80. The characteristics of a dynamic service are initially only known to the WCCPv2 clients within the service group. The characteristics of the service group are communicated to the IOS devices by the first WCCPv2 client device to join the service group.</span></div>
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<span style="font-size: large;">A unique service ID identifies service groups, which is a number from 0 to 255. Service IDs 0 to 50 are reserved for well-known services.</span></div>
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<span style="font-size: large;">The WCCPv2 implementation in WAAS supports a single dynamic WCCPv2 service, the tcp-promiscuous service. Although referred to in WAAS as a single service, the tcp-promiscuous service is in fact two different services. The two service IDs enabled with the tcp-promiscuous service are 61 and 62. These are the two service group IDs that are configured in IOS when using WCCPv2 with WAAS. Two different service groups are used because both directions (client-to-server and server-to-client) of a TCP connection must be transparently intercepted. To optimize a connection, WAAS must see both directions of the connection on the same WAE. Not only does WAAS intercept the connection in both directions, but it also intercepts the connection on both sides of the WAN link. Because the packet Layer 3 and Layer 4 headers are preserved, transparent interception is used on both sides of the WAN in both directions to redirect connections to the WAAS infrastructure for optimization.</span></div>
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<span style="font-size: large;">What is the difference between services 61 and 62? </span></div>
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<span style="font-size: large;">WCCP Service Group Attributes</span></h4>
<pre style="background-color: #f7f7f7; color: #333333; margin: 10px; overflow: auto !important; padding: 10px; width: 350px;"><span style="font-size: large;">RTR-02# <strong>show ip wccp 61 service</strong>
WCCP service information definition:
Type: Dynamic
Id: 61
Priority: 34
Protocol: 6
Options: 0x00000501
--------
Hash: SrcIP
Alt Hash: SrcIP SrcPort
Ports: -none-
RTR-02#
RTR-02# <strong>show ip wccp 62 service</strong>
WCCP service information definition:
Type: Dynamic
Id: 62
Priority: 34
Protocol: 6
Options: 0x00000502
--------
Hash: DstIP
Alt Hash: SrcIP SrcPort
Ports: -none-
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<span style="font-size: large;">The tcp-promiscuous services define TCP as the protocol and do not define any ports. By not defining any ports as part of the service groups, this causes interception and redirection of all TCP traffic. When traffic passes through an interface in the IOS device with WCCPv2 redirection configured, it is evaluated against the protocol and port combination defined by the service to determine whether or not the packet should be redirected. By default this is the only criteria that is used to determine whether or not a packet is redirected. It is important to note that the IOS WCCPv2 implementation is not stateful. This means that IOS WCCPv2 is only dealing with redirected traffic on a packet-by-packet basis. It does not keep track of TCP connection state for redirected traffic. On the other hand, the WCCPv2 implementation in WAAS is stateful. WAAS tracks each connection as a flow throughout the life of the connection.</span><span style="font-size: large;">The command output shows that the only difference between services 61 and 62 is the value from the packet used as the hash key. By default, service group 61 hashes on the source IP address and service group 62 hashes on the destination IP address. . By default, the <strong>spoof-client-ip</strong> feature is enabled for both services. This is the WCCPv2 feature that allows WAAS to handle optimized traffic transparently. Traffic forwarded to the WAE uses the same source and destination IP addresses and TCP ports as when it entered the WAE.</span></div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-39309166366606625482014-05-25T00:39:00.000-07:002014-05-26T03:55:26.681-07:00Deploying WAAS with WCCP<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;">As we know WAAS relies on network interception to be integrated into network as well as to receive packet from flows that should be optimized . WCCP gives a transparent redirection of packets towards the WAAS devices(WAE) for application acceleration and WAN optimization .</span><br />
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<span style="font-size: large;">This section will provide you the basic understanding of how WCCP works and how to configure and manage a WCCP deployment for WAAS.</span></div>
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<span style="font-size: large;">WCCPv2 is a protocol that allow WAE devices to join a service group with network devices (like switches routers or firewalls) so that they will inject itself in the path of traffic to optimize or otherwise manipulate flows. Once we configure WCCP properly , the network device will identify the traffic which matches the criteria defined in configured service groups. When the traffic is identified the network devices will then redirect the traffic to one of the registered service devices such as Cisco WAE in our case , using either a <span style="font-family: Times, serif;">Generic Route Encapsulation tunnel (GRE) or
through frame header rewriting, called Layer 2 redirection (L2-redirect). Once the WAE intercept the packets it can apply its function or polices on that flow.</span></span></div>
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WCCP Protocol Basics</span></h4>
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<span style="font-size: large; font-weight: normal;">
WCCPv2 defines mechanisms to allow one or more routers enabled for transparent redirection to discover, verify, and advertise connectivity to one or more WAAS devices. Having established connectivity, the routers and WAAS devices form Service Groups to handle the redirection of traffic whose characteristics are part of the Service Group definition.</span></h4>
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The protocol provides the means to negotiate the specific method used for load distribution among WAAS devices and also the method used to transport traffic between router and cache. A single WAAS device within a Service Group is elected as the designated WAE. It is the responsibility of the designated WAE to provide routers in the Service Group with the data which determines how redirected traffic is distributed between the WAAS devices in the Service Group</span></h4>
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Joining a Service Group</span></h4>
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<span style="font-family: Times, serif; font-size: large;">A Service Group is a group of one or more routers plus one or more WAAS devices working together in the redirection of traffic whose characteristics are part of the Service Group definition. A WAAS device joins and maintains its membership in a Service Group by transmitting a WCCP2_HERE_I_AM (HIA) message to each router in the Group at 2 second intervals. This may be by unicast to each router or multicast to the configured Service Group multicast address. The Web Cache Info component in the WCCP2_HERE_I_AM message identifies the WAAS device by IP address and the Service Info component identifies and describes the Service Group in which the WAAS device wishes to participate.</span><br />
<span style="font-size: large;"><span style="font-family: Times, serif;"><br /></span>
<span style="font-family: Times, serif;">A router responds to a WCCP2_HERE_I_AM message with a WCCP2_I_SEE_YOU (ISU) message. If the WCCP2_HERE_I_AM message was unicast then the router will respond immediately with a unicast WCCP2_I_SEE_YOU message. If the WCCP2_HERE_I_AM message was multicast, the router will respond via the scheduled multicast WCCP2_I_SEE_YOU message for the Service Group.</span></span><br />
<span style="font-family: Times, serif; font-size: large;">A router responds to multicast cache engine members of a Service Group using a multicast WCCP2_I_SEE_YOU message transmitted at 9 second intervals with a 10% jitter. The Router Identity component in a WCCP2_I_SEE_YOU message includes a list of the WAAS devices to which the packet is addressed. </span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: large;">53<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">202<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-bottom: solid windowtext 1.0pt; border-left: solid black 1.0pt; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">ftp-native<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">60<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">200<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="background: #FFFF99; border-bottom: solid windowtext 1.0pt; border-left: solid black 1.0pt; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp-promiscuous<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">61<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">*<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">34<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="background: #FFFF99; border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp-promiscuous<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">62<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">*<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">34<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-bottom: solid windowtext 1.0pt; border-left: solid black 1.0pt; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">https-cache<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">70<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">443<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">231<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="background: #FFFF99; border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">Rtsp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">80<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">554<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">200<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="background: #FFFF99; border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">Wmt<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">81<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">1755<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">201<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">Mmsu<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">82<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">udp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">1755<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">201<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">Rtspu<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">83<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">udp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">5005<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">201<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">cifs-cache<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">89<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">139, 445<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">224<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">Custom<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">90-97<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">220-227<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-bottom: solid windowtext 1.0pt; border-left: solid black 1.0pt; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">custom-web-cache<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">98<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">80<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid windowtext 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-bottom-alt: solid windowtext .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">230<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="background: #FFFF99; border-top: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 106.55pt;" valign="bottom" width="142"><div class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 8.1pt; margin-right: 0in; margin-top: 1.0pt;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">reverse-proxy<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 91.35pt;" valign="bottom" width="122"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 9.55pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">99<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.1pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 11.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">tcp<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 58.5pt;" valign="bottom" width="78"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">80<o:p></o:p></span></div>
</td>
<td style="background: #FFFF99; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 63.0pt;" valign="bottom" width="84"><div align="center" class="MsoNormal" style="margin-bottom: 1.0pt; margin-left: 2.7pt; margin-right: 0in; margin-top: 1.0pt; text-align: center;">
<span style="font-family: "Times New Roman","serif"; font-size: large;">235<o:p></o:p></span></div>
</td>
</tr>
</tbody></table>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large; white-space: pre-wrap;"><br /></span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large; white-space: pre-wrap;"><br /></span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large; white-space: pre-wrap;">Describing a Service Group</span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large; white-space: pre-wrap;">
<span style="font-weight: normal;">The Service Info component of a WCCP2_HERE_I_AM message describes the Service Group in which a WAAS device wishes to participate. A Service Group is identified by Service Type and Service ID. There are two types of Service Group:
· Well Known Services
· Dynamic Services.
Well Known Services are known by both routers and cache engines and do not require a description other than a Service ID. Service IDs can range from 0 to 255 with the 0-50 range reserved for Well Know Services. Currently, web-cache is the only defined Well Known Service. In contrast Dynamic Services must be fully described to a router. A router may be configured to participate in a particular Dynamic Service Group, identified by Service ID, without any knowledge of the characteristics of the traffic associated with the Service Group. The traffic description is communicated to the router in the WCCP2_HERE_I_AM message of the first cache engine to join the Service Group. A cache engine describes a Dynamic Service using the Protocol, Service Flags and Port fields of the Service Info component. Once a Dynamic Service has been defined a router will discard any subsequent WCCP2_HERE_I_AM message which contains a conflicting description. A router will also discard a WCCP2_HERE_I_AM message which describes a Service Group for which the router has not been configured.</span></span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large;"><span style="font-weight: normal;">Lets see how the packet format looks , we will not going to see every details we will only see which is of our concern here.</span></span></h4>
<div>
<pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">'Here I Am' Message
+--------------------------------------+
| WCCP Message Header |
+--------------------------------------+
| Security Info Component |
+--------------------------------------+
| Service Info Component |
+--------------------------------------+
| Web-Cache Identity Info Component |
+--------------------------------------+
| Web-Cache View Info Component |
+--------------------------------------+
| Capability Info Component (optional) |
+--------------------------------------+
|Command Extension Component (optional)|
+--------------------------------------+</span></pre>
<pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="color: purple; font-size: large;">
</span></pre>
<pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="color: purple; font-size: large;">
</span></pre>
</div>
<h4 style="text-align: left; word-wrap: break-word;">
<pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Service Info Component
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Type | Service ID | Priority | Protocol |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Flags |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port 0 | Port 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . |
| . |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port 6 | Port 7 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
WCCP2_SERVICE_INFO (1)
Length
Length of the remainder of the component.
Service Type
WCCP2_SERVICE_STANDARD (0).
Service is a well known service and is described by the Service ID.
All fields other than Service ID must be zero.
WCCP2_SERVICE_DYNAMIC (1).
Service is defined by the Protocol, Service Flags and Port fields.
Service ID
Service number. A number in the range 0-255. For well known services
numbers in the range 0-50 are reserved. The numbers currently defined
for well known services are:
0x00 HTTP
</span></pre>
<pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">
</span></pre>
<div>
<pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Priority
Service priority. The lowest priority is 0, the highest is
255. Packets for redirection are matched against Services in priority
order, highest first. Well known services have a priority of 240.
Protocol
IP protocol identifier
Service Flags
0x0001 Source IP Hash
0x0002 Destination IP Hash
0x0004 Source Port Hash
0x0008 Destination Port Hash
0x0010 Ports Defined.
0x0020 Ports Source.
0x0100 Source IP Alternative Hash
0x0200 Destination IP Alternative Hash
0x0400 Source Port Alternative Hash
0x0800 Destination Port Alternative Hash</span></pre>
</div>
<span style="font-size: large; white-space: pre-wrap;"><h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large; white-space: pre-wrap;"><br /></span></h4>
</span><pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Port 0-7
Zero terminated list of UDP or TCP port identifiers. Packets will be
matched against this set of ports if the Ports Defined flag is set. If
the Ports Source flag is set the port information refers to a source
port, if clear the port information refers to a destination port.
</span></pre>
<div>
<span style="font-size: large;"><br /></span></div>
<span style="font-size: large; white-space: pre-wrap;">
Establishing Two-Way Connectivity</span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<span style="font-size: large;"><span style="white-space: pre-wrap;">
<span style="font-weight: normal;">
WCCP V2.0 uses a "Receive ID" to verify two-way connectivity between a router and a web-cache. The Router Identity Info component of a WCCP2_I_SEE_YOU message contains a "Receive ID" field. This field is maintained separately for each Service Group and its value is incremented each time the router sends a WCCP2_I_SEE_YOU message to the Service Group.
The "Receive ID" sent by a router is reflected back by a web-cache in the Web-Cache View Info component of a WCCP2_HERE_I_AM message. A router checks the value of the "Receive ID" in each WCCP2_HERE_I_AM message received from a Service Group member. If the value does not
match the "Receive ID" in the last WCCP2_I_SEE_YOU message sent to that member the message is discarded.
A router considers a web-cache to be a usable member of a Service Group only after it has sent that web-cache a WCCP2_I_SEE_YOU message and received a WCCP2_HERE_I_AM message with a valid "Receive ID" in response.</span></span></span></h4>
<h4 style="word-wrap: break-word;">
<span style="font-size: large;"><span style="font-weight: normal;">Lets see how the packet format looks , we will not going to see every details we will only see which is of our concern here.</span></span></h4>
<div>
<pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">'I See You' Message
+--------------------------------------+
| WCCP Message Header |
+--------------------------------------+
| Security Info Component |
+--------------------------------------+
| Service Info Component |
+--------------------------------------+
| Router Identity Info Component |
+--------------------------------------+
| Router View Info Component |
+--------------------------------------+
| Assignment Info Component |
| OR |
| Assignment Map Component |
+--------------------------------------+
| Capability Info Component (optional) |
+--------------------------------------+
|Command Extension Component (optional)|
+--------------------------------------+
</span></pre>
</div>
<div>
<pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Router Identity Info Component
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Router ID Element |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sent To Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number Received From |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Received From Address 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . |
| . |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Received From Address n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></pre>
</div>
<h4 style="text-align: left; word-wrap: break-word;">
<pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Router ID Element
Element containing the router's identifying IP address and Receive
ID. The IP address must be a valid, reachable address for the router.</span></pre>
<pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><pre style="white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Web Cache View Info Component
This represents a web-cache's view of the Service Group.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Change Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Routers |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Router ID Element 0 |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Router ID Element n |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of Web-Caches |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Web Cache address 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . |
| . |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Web Cache address n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></pre>
<span style="font-size: large;">
</span></pre>
<span style="font-size: large;"><span style="white-space: pre-wrap;">
</span></span><pre style="font-weight: normal; white-space: pre-wrap; word-wrap: break-word;"><span style="font-size: large;">Router ID Element 0-n
List of elements containing the identifying IP address for each router
in the Service Group and the last "Received ID" from each.</span></pre>
<span style="font-size: large;"><span style="white-space: pre-wrap;">
</span><a href="https://www.blogger.com/null" name="_Toc241505079"></a></span></h4>
<h4>
<span style="font-family: Times, serif; font-size: large;">Redirect Method</span></h4>
<h4>
<span style="font-family: Times, serif; font-size: large;"><br /></span></h4>
<h4>
<span style="font-family: Times, serif; font-size: large; font-weight: normal;">The Redirect Method, also known as the Forwarding Method, is the method by which redirected packets are transported from router to WAAS device. This method is negotiated between the router and the WAAS device. While the WCCPv2 protocol allows different cache engines to use different redirect methods.Each Cisco WAAS device belonging to a service group will use the same redirect method.</span></h4>
<h4 style="text-align: left; word-wrap: break-word;">
<div class="Body">
<span style="font-size: large; font-weight: normal;"><o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large; font-weight: normal;">A router will advertise the supported redirect methods for a
Service Group using the optional Capabilities Info component of the
WCCP2_I_SEE_YOU message. The absence of such an advertisement implies the
router supports the default GRE encapsulation method only.<o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large; font-weight: normal;"><br /></span></div>
<div class="Body">
<span style="font-size: large; font-weight: normal;">Cisco WAAS supports two different Forwarding Methods:<o:p></o:p></span></div>
<div class="Body" style="margin-bottom: .0001pt; margin-bottom: 0in; margin-left: .5in; margin-right: 0in; margin-top: 0in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large; font-weight: normal;">1.
<!--[endif]-->WCCP GRE <o:p></o:p></span></div>
<div class="Body">
</div>
<div class="Body" style="margin-bottom: .0001pt; margin-bottom: 0in; margin-left: .5in; margin-right: 0in; margin-top: 0in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large; font-weight: normal;">2.
<!--[endif]-->WCCP Layer 2 (L2)</span></div>
<div class="Body" style="margin-bottom: .0001pt; margin-bottom: 0in; margin-left: .5in; margin-right: 0in; margin-top: 0in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<span style="font-size: large;"><br /></span></div>
<span style="font-size: large;">
WCCP GRE</span><div class="Subhead3">
<a href="https://www.blogger.com/null" name="_Toc232921462"><span style="font-size: large;"><br /></span></a></div>
<div class="Body">
<span style="font-size: large; font-weight: normal;"><i>WCCP GRE,</i> also known as
Layer 3 Generic Routing Encapsulation (GRE), allows packets to reach the WAAS device
even if there are other routers in the path between the forwarding router and
the WAAS device. The connection between the router and the WAAS device is also
known as a <i>GRE Tunnel</i>. Packet
redirection is handled entirely by the router software. GRE encapsulates the selected datagram with
the GRE header containing the routing information to the selected WAAS device.
The WAAS device de-encapsulates the datagram, evaluates the payload using the static
bypass rules and WAAS Policy specification, and either accepts or rejects the
packet. If the packet is accepted for optimization, standard TCP connection
setup occurs between the client and the WAAS device and between the WAAS device
and the destination server. If the packet is rejected because of a static
bypass rule, it is re-encapsulated and returned to the router. The router
understands that the WAE is not interested in this connection and forwards the
packet to its original destination. All
other packets, pass-through or optimized, are returned to the router using the
configured packet egress method. <o:p></o:p></span></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoNormalTable" style="border-collapse: collapse; border: none; mso-border-alt: solid black .5pt; mso-border-insideh: .5pt solid black; mso-border-insidev: .5pt solid black; mso-padding-alt: 0in 5.4pt 0in 5.4pt; mso-table-layout-alt: fixed; mso-yfti-tbllook: 1184;">
<tbody>
<tr>
<td style="border: none; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" valign="bottom" width="73"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" valign="bottom" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">IP<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" valign="bottom" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Port<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" valign="top" width="114"><div class="Body">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border: none; mso-cell-special: placeholder; padding: 0in 0in 0in 0in;" width="52"><div class="MsoNormal">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Source<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">1.1.1.1<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5432<o:p></o:p></span></div>
</td>
<td colspan="2" rowspan="2" style="background: #E5E5E5; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; mso-pattern: gray-10 auto; mso-shading: windowtext; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" width="114"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Payload<o:p></o:p></span></div>
</td>
<td style="border: none; mso-cell-special: placeholder; padding: 0in 0in 0in 0in;" width="52"><div class="MsoNormal">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Destination<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5.5.5.5<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">80<o:p></o:p></span></div>
</td>
<td style="border: none; mso-cell-special: placeholder; padding: 0in 0in 0in 0in;" width="52"><div class="MsoNormal">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
<tr>
<td style="border: none; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;"><br /></span></div>
</td>
<td colspan="5" style="border: none; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 171.0pt;" width="228"><div class="Body">
<span style="font-size: large;">Original Packet sent from IP
1.1.1.1 to IP 5.5.5.5<o:p></o:p></span></div>
</td>
<td style="border: none; mso-cell-special: placeholder; padding: 0in 0in 0in 0in;" width="52"><div class="MsoNormal">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
<tr>
<td style="border: none; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" valign="bottom" width="73"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" valign="bottom" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">IP<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 39.15pt;" valign="bottom" width="52"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">IP<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" valign="bottom" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Port<o:p></o:p></span></div>
</td>
<td colspan="2" style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" valign="top" width="114"><div class="Body">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
</tbody></table>
<div class="Body" style="margin-bottom: .0001pt; margin-bottom: 0in; margin-left: .5in; margin-right: 0in; margin-top: 0in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<span style="font-size: large; font-weight: normal;"><br /></span></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoNormalTable" style="border-collapse: collapse; border: none; mso-border-alt: solid black .5pt; mso-border-insideh: .5pt solid black; mso-border-insidev: .5pt solid black; mso-padding-alt: 0in 5.4pt 0in 5.4pt; mso-table-layout-alt: fixed; mso-yfti-tbllook: 1184;">
<tbody>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Source<o:p></o:p></span></div>
</td>
<td style="background: #DAEEF3; border-left: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" valign="top" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">2.2.2.2<o:p></o:p></span></div>
</td>
<td style="border-left: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 39.15pt;" width="52"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">1.1.1.1<o:p></o:p></span></div>
</td>
<td style="border-left: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5432<o:p></o:p></span></div>
</td>
<td rowspan="2" style="background: #E5E5E5; border-left: none; border: solid black 1.0pt; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-pattern: gray-10 auto; mso-shading: windowtext; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" width="114"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Payload<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Destination<o:p></o:p></span></div>
</td>
<td style="background: #DAEEF3; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 36.6pt;" valign="top" width="49"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">3.3.3.3<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 39.15pt;" width="52"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5.5.5.5<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 48.9pt;" width="65"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">80<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border: none; padding: 0in 5.4pt 0in 5.4pt; width: 54.9pt;" width="73"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;"><br /></span></div>
</td>
<td colspan="4" style="border: none; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 210.15pt;" valign="top" width="280"><div class="Body">
<span style="font-size: large;">GRE Encapsulated Packet redirected
from router at IP 2.2.2.2 to WAAS device at 3.3.3.3. Original packet persevered.<o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
</tbody></table>
<div class="Body">
<span style="font-size: large;"><span style="font-weight: normal;">When using GRE encapsulation for WCCP redirection, the router
uses the router ID IP address as its source IP address. The router ID IP
address is the highest loopback address on the router, or if the loopback
interface is not configured, the router ID IP address is the highest address of
the physical interfaces. The router ID IP address is used as the source address
for packets redirected from the router to the Cisco WAAS device, and as a
result it is also used as the destination address for traffic from the Cisco
WAE to the router. </span><o:p></o:p></span></div>
</h4>
</div>
</div>
<div>
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a><br />
</span><br />
<div class="Subhead3">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a>WCCP L2 <o:p></o:p></span><br />
<span style="font-size: large;"><br /></span></div>
<div class="Body">
<span style="font-size: large;"> WCCP L2 (Layer-2 ) redirection
takes advantage of internal switching
hardware that either partially or fully implements the WCCP traffic
interception and redirection functions at Layer 2. Redirection occurs by overwriting the original
MAC header of the IP packet with the MAC header of one of the WAAS devices in
the Service Group. With L2 Redirection, the first redirected traffic packet is
handled by either the router software or router hardware, depending on the
platform and/or software version. The rest of the traffic may be handled by the
router hardware on supported routers and switches making L2 redirection more
efficient than Layer 3 GRE. Using
L2 Redirection as a forwarding method allows direct forwarding to the WAAS
device without further lookup. Layer-2 redirection requires that WAAS devices
be directly connected to an interface on each WCCP router. Unless multicast IP
addresses are used, WCCP configuration of the WAAS device must reference the
directly connected interface IP address of the WCCP router and not a loopback
IP address or any other IP address configured on the WCCP router.<o:p></o:p></span></div>
<table border="1" cellpadding="0" cellspacing="0" class="MsoNormalTable" style="border-collapse: collapse; border: none; mso-border-alt: solid black .5pt; mso-border-insideh: .5pt solid black; mso-border-insidev: .5pt solid black; mso-padding-alt: 0in 5.4pt 0in 5.4pt; mso-table-layout-alt: fixed; mso-yfti-tbllook: 1184;">
<tbody>
<tr>
<td style="border: none; padding: 0in 5.4pt 0in 5.4pt; width: 59.4pt;" valign="bottom" width="79"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;"><br /></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 81.0pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">MAC<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: .5in;" valign="bottom" width="48"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">IP<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 40.05pt;" valign="bottom" width="53"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Port<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border: none; mso-border-bottom-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" valign="top" width="114"><div class="Body">
<span style="font-size: large;"><br /></span></div>
</td>
</tr>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 59.4pt;" width="79"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Source<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 81.0pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">01.01.01.01.01.01<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: .5in;" width="48"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">1.1.1.1<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 40.05pt;" width="53"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5432<o:p></o:p></span></div>
</td>
<td rowspan="2" style="background: #E5E5E5; border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; mso-pattern: gray-10 auto; mso-shading: windowtext; padding: 0in 5.4pt 0in 5.4pt; width: 85.5pt;" width="114"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">Payload<o:p></o:p></span></div>
</td>
</tr>
<tr>
<td style="border-right: solid black 1.0pt; border: none; mso-border-right-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 59.4pt;" width="79"><div align="right" class="Body" style="text-align: right;">
<span style="font-size: large;">Destination<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 81.0pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">05.05.05.05.05.05<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: .5in;" width="48"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">5.5.5.5<o:p></o:p></span></div>
</td>
<td style="border-bottom: solid black 1.0pt; border-left: none; border-right: solid black 1.0pt; border-top: none; mso-border-alt: solid black .5pt; mso-border-left-alt: solid black .5pt; mso-border-top-alt: solid black .5pt; padding: 0in 5.4pt 0in 5.4pt; width: 40.05pt;" width="53"><div align="center" class="Body" style="text-align: center;">
<span style="font-size: large;">80<o:p></o:p></span></div>
</td>
</tr>
</tbody></table>
</div>
<div>
<span style="font-size: large;"><table border="1" cellpadding="0" cellspacing="0" class="MsoNormalTable" style="border-collapse: collapse; border: none;"><tbody>
<tr><td colspan="4" style="border-style: solid none none; border-top-color: black; border-top-width: 1pt; padding: 0in 5.4pt; width: 242.55pt;" valign="top" width="323"><div class="Body">
Original Packet sent from IP 1.1.1.1 to IP 5.5.5.5<o:p></o:p></div>
</td></tr>
<tr><td style="border-bottom-color: black; border-bottom-width: 1pt; border-style: none none solid; padding: 0in 5.4pt; width: 81pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
MAC<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-style: none none solid; padding: 0in 5.4pt; width: 0.5in;" valign="bottom" width="48"><div align="center" class="Body" style="text-align: center;">
IP<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-style: none none solid; padding: 0in 5.4pt; width: 40.05pt;" valign="bottom" width="53"><div align="center" class="Body" style="text-align: center;">
Port<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-style: none none solid; padding: 0in 5.4pt; width: 85.5pt;" valign="top" width="114"><div class="Body">
<br /></div>
</td></tr>
<tr><td style="background-color: #daeef3; background-position: initial initial; background-repeat: initial initial; border-bottom-color: black; border-bottom-width: 1pt; border-left-color: black; border-left-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid; padding: 0in 5.4pt; width: 81pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
02.02.02.02.02.02<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid none; padding: 0in 5.4pt; width: 0.5in;" width="48"><div align="center" class="Body" style="text-align: center;">
1.1.1.1<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid none; padding: 0in 5.4pt; width: 40.05pt;" width="53"><div align="center" class="Body" style="text-align: center;">
5432<o:p></o:p></div>
</td><td rowspan="2" style="background-color: #e5e5e5; background-position: initial initial; background-repeat: initial initial; border-bottom-color: black; border-bottom-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid none; padding: 0in 5.4pt; width: 85.5pt;" width="114"><div align="center" class="Body" style="text-align: center;">
Payload<o:p></o:p></div>
</td></tr>
<tr><td style="background-color: #daeef3; background-position: initial initial; background-repeat: initial initial; border-bottom-color: black; border-bottom-width: 1pt; border-left-color: black; border-left-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid; padding: 0in 5.4pt; width: 81pt;" valign="top" width="108"><div align="center" class="Body" style="text-align: center;">
03.03.03.03.03.03<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid none; padding: 0in 5.4pt; width: 0.5in;" width="48"><div align="center" class="Body" style="text-align: center;">
5.5.5.5<o:p></o:p></div>
</td><td style="border-bottom-color: black; border-bottom-width: 1pt; border-right-color: black; border-right-width: 1pt; border-style: none solid solid none; padding: 0in 5.4pt; width: 40.05pt;" width="53"><div align="center" class="Body" style="text-align: center;">
80<o:p></o:p></div>
</td></tr>
<tr><td colspan="4" style="border: none; padding: 0in 5.4pt; width: 242.55pt;" valign="top" width="323"><div class="Body">
L2 Rewrite redirects packet from router at MAC 02.02.02.02.02.02 to WAAS device at MAC 03.03.03.03.03.03. Original packet persevered.<o:p></o:p></div>
</td></tr>
</tbody></table>
</span></div>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921461"><span style="font-size: large;"><br /></span></a></div>
<div>
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a><br />
</span><br />
<h4 style="text-align: left;">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a>Assignment Method</span></h4>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921464"><span style="font-size: large;"><br /></span></a></div>
<div class="Subhead2">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505082"></a><o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">The <i>Assignment Method</i>
is the method by which redirected packets are distributed between the WAAS
devices in a Service Group effectively providing load balancing among the WAAS
devices. This method is negotiated between a router and all cache engines on a
per Service Group basis. Cache engines participating in multiple Service Group
may have different assignment methods for each Service Group but all cache
engines within a single Service Group will use the same Assignment Method. A
router may advertise the supported assignment methods for a Service Group using
the optional Capabilities Info component of the WCCP2_I_SEE_YOU message. The
absence of such an advertisement implies the router supports the default Hash
assignment method only.<o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">There are two types of assignment methods:<o:p></o:p></span></div>
<div class="Bullet2">
<!--[if !supportLists]--><span style="font-size: large;">1. <!--[endif]-->Hash
Table Assignment<o:p></o:p></span></div>
<div class="Bullet2">
<!--[if !supportLists]--><span style="font-size: large;">2. <!--[endif]-->Mask/Value
Sets Assignment<o:p></o:p></span><br />
<span style="font-size: large;"><br /></span></div>
<div class="Subhead3">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505083"></a>Hash Assignment<o:p></o:p></span><br />
<span style="font-size: large;"><br /></span></div>
<div class="Body">
<span style="font-size: large;">The default Assignment Method uses Hash Tables to load balance
and select a particular WAAS device from those registered in the Service Group.
With Hash Assignment, each router in the Service Group uses a 256-bucket
Redirection Hash Table to distribute traffic for a Service Group across the
member WAAS devices. The hash key may be based on any combination of the source
and destination IP and port of the packet. For WAAS, load-balancing hashing is
based on a source IP address (default), a destination IP address, or both.<o:p></o:p></span><br />
<span style="font-size: large;"><br /></span></div>
<div class="Subhead3">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505084"></a>Mask/Value Assignment<o:p></o:p></span><br />
<span style="font-size: large;"><br /></span></div>
<span style="font-family: "Times","serif"; font-size: large;">When
using mask assignment, each router uses masks and a table of values to
distribute traffic for a Service Group across the member WAAS devices. It is
the responsibility of the Service Group's designated cache engine to assign
each router's mask/value sets. For WAAS, the default mask value is 0x1741 and
is applied to the source IP address for service 61 and the destination IP
address for service 62. The Mask Value can be specified with a maximum of 7
bits and like the hash key, can be configured to cover both the source as well
as the destination address space. </span></div>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921461"><span style="font-family: "Times","serif"; font-size: large;"><br /></span></a></div>
<div>
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a><br />
</span><br />
<div class="Subhead2">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"></a><a href="https://www.blogger.com/null" name="_Toc241505085"></a>Packet Return Method<o:p></o:p></span></div>
<span style="font-size: large;"><span style="font-family: "Times","serif";">The
<i>Packet Return Method</i> is the method by
which packets <b><i>not</i></b> selected for optimization (i.e. packets which satisfy a
static bypass rule or packets which do not satisfy <i>any</i> policy classifier) are returned to a router/switch for normal
forwarding. The Packet Return Method </span>is not required to match the Forwarding method. The return method
is negotiated between a router and all WAAS devices on a per Service Group
basis. While the WCCPv2 protocol allows different cache engines to use
different packet return methods, Cisco WAAS and IOS-WCCP prevent this from
happening. A router will advertise the
supported packet return methods for a Service Group using the optional
Capabilities Info component of the WCCP2_I_SEE_YOU message. The absence of such
an advertisement implies the router supports the default GRE packet return
method only.</span></div>
<div class="Body">
<span style="font-size: large;"><o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">Cisco WAAS supports two different Packet Return Methods:<o:p></o:p></span></div>
<div class="Body" style="margin-left: .5in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large;">1.
<!--[endif]-->WCCP GRE (default)<o:p></o:p></span></div>
<div class="Body" style="margin-left: .5in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<span style="font-size: large;"><o:p></o:p></span></div>
<div>
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc232921461"><span style="text-indent: -0.25in;"> </span></a> 2. WCCP L2</span></div>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921461"><span style="font-family: "Times","serif"; font-size: large;"><br /></span></a></div>
<h4 style="text-align: left;">
<span style="font-size: large;">Packet Egress Method</span></h4>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921470"><span style="font-size: large;"><br /></span></a></div>
<div>
<a href="https://www.blogger.com/null" name="_Toc232921470"><span style="font-size: large;"><br /></span></a></div>
<div class="Subhead2">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505088"></a><o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">Beginning with Cisco WAAS Release 4.0.13, WAAS provides an
alternate packet return method for packets satisfying a policy classifier
including both optimized packets and packets specified by policy action as
pass-through. This method is called the <i>Packet
Egress Method</i> and can be defined separately from the Packet Return Method
used for bypassed packets. <o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">Cisco WAAS supports three different Packet Egress Methods:<o:p></o:p></span></div>
<div class="Body" style="margin-left: .5in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large;">1.
<!--[endif]-->IP Forwarding (default)<o:p></o:p></span></div>
<div class="Body" style="margin-left: .5in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large;">2.
<!--[endif]-->WCCP Negotiated Return<o:p></o:p></span></div>
<div class="Body" style="margin-left: .5in; mso-list: l0 level1 lfo1; text-indent: -.25in;">
<!--[if !supportLists]--><span style="font-size: large;">3.
<!--[endif]-->Generic GRE Return<o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;"><br /></span></div>
<div class="Subhead3">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505089"></a>IP Forwarding<o:p></o:p></span></div>
<div class="Subhead3">
<a href="https://www.blogger.com/null" name="_Toc232921471"><span style="font-size: large;"><br /></span></a></div>
<div class="Body">
<span style="font-size: large;">IP Forwarding is the default Packet Egress Method and sends
optimized packets to the configured default gateway of the WAAS device. With
the IP forwarding egress method WAAS devices cannot be placed on the same VLAN
or subnet as the clients and servers, and it does not ensure that packets are
returned to the original intercepting router.<o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;"><br /></span></div>
<div class="Subhead3">
<span style="font-size: large;"> WCCP Negotiated Return</span></div>
<div class="Subhead3">
<span style="font-size: large;"><br /></span></div>
<div class="Subhead3">
<span style="font-size: large;">WCCPv2 is capable of negotiating the redirect method and the return method for intercepted connections. Cisco WAAS supports both WCCP L2 Rewrite and WCCP GRE as negotiated Packet Return Methods. If WCCP negotiates a WCCP Layer 2 Rewrite return, as Cisco WAAS does not support L2 Rewrite return as a Packet Egress method, the WAAS device defaults to using IP forwarding as the egress method.</span></div>
<div class="Body">
<span style="font-size: large;"><o:p></o:p></span></div>
<span style="font-family: "Times","serif"; font-size: large;">If
WCCP GRE return is negotiated as the packet egress method, the behavior of
packet egress return depends on the intercept method. For GRE intercept, all packets are egressed
to the designated router’s routerID. The routerID must be reachable, and
preferably via the shortest path, which may require static route
configuration. For L2 intercept,
packets are egressed to the L2 adjacent address of the router (except for flow
protection, where packets may be egressed to a router’s routerID), and Cisco
WAAS requires (but does not enforce) that the WAAS device’s routerlist should
contain the router's L2 adjacent addresses. </span><br />
<div class="Subhead1">
<span style="font-size: large;"><o:p></o:p></span></div>
</div>
<div>
<div class="Subhead3">
<a href="https://www.blogger.com/null" name="_Toc232921473"><span style="font-size: large;"><br /></span></a></div>
<div class="Subhead3">
<span style="font-size: large;"><a href="https://www.blogger.com/null" name="_Toc241505091"></a>Generic GRE Return<o:p></o:p></span></div>
<div class="Subhead3">
<a href="https://www.blogger.com/null" name="_Toc232921473"><span style="font-size: large;"><br /></span></a></div>
<div class="Body">
<span style="font-size: large;">Like WCCP GRE Return, generic GRE Return also performs the
reverse of GRE Encapsulation. The generic GRE egress method is supported only
when the WCCP GRE is specified as the Redirect Method. If the interception
method is set to WCCP Layer 2 and you configure generic GRE return as the
egress method, the WAAS device will default to IP forwarding as the egress
method as WCCP L2 Redirect method and generic GRE return are not compatible. <o:p></o:p></span></div>
<div class="Body">
<span style="font-size: large;">With generic GRE return, after optimization is performed, the
packet will be returned to the same router from which it was originally
redirected, preserving the original packet flow path. The generic GRE egress
method returns packets to the intercepting router by using a GRE tunnel that
must be manually configured on the router<a href="file:///C:/ani/klanzill-WAAS_WCCP_Deploy1.doc#_ftn1" name="_ftnref1" title=""><span class="MsoFootnoteReference"><b><!--[if !supportFootnotes]--><span class="MsoFootnoteReference"><b><span style="color: black; font-family: "Times","serif";">[1]</span></b></span><!--[endif]--></b></span></a>. Unlike the WCCP
GRE Return method, generic GRE Return was designed specifically to allow packets
to be processed in hardware on platforms like the Cisco 7600 series router or
the Catalyst 6000 series router with Sup32 or Sup720, increasing the overall
performance on the router and eliminating the risk of CPU overload. <o:p></o:p></span></div>
<div>
<br />
<div id="ftn1">
</div>
</div>
</div>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com3tag:blogger.com,1999:blog-481832570095352276.post-4890988273337372502014-05-21T04:14:00.000-07:002014-05-25T02:24:22.282-07:00WAAS Interception methods<div dir="ltr" style="text-align: left;" trbidi="on">
<br />
<br />
<span style="font-size: large;">WAAS relies on some form of network interception to integrate into the network and receive packets from flows that are to be optimized. WAAS supports four methods of network interception listed below:</span><br />
<span style="font-size: large;"><br /></span>
<h4 style="text-align: left;">
<span style="font-size: large;">
Physical inline interception</span></h4>
<span style="font-size: large;">The WAE appliance (the router integrated network module does not support physical inline) is deployed physically between two network devices, most commonly between a router and a switch in a branch office. This allows all traffic traversing the network toward the WAN or returning from the WAN to physically pass through the WAE, thereby giving it the opportunity to optimize or unoptimize. Physical inline can be used in any type of location (branch office, regional office, data center), but is commonly used for branch office implementations.Normally this is not used much because of the scalability factor .</span><br />
<span style="font-size: large;"><br /></span>
<span style="font-size: large;"><br /></span>
<h4 style="text-align: left;">
<span style="font-size: large;">
Policy-Based Routing (PBR)</span></h4>
<span style="font-size: large;">The WAAS devices support PBR, which provides an off-path but virtually in-line deployment. With PBR, WAE devices are deployed as appliances (nodes on the network and not physically in-line) and policies are configured within the layer-3 topology that will route traffic going to or coming from the WAN through the WAE device first. PBR provides high-availability and failover capabilities (requires use of CDP neighbor checking or IP SLA) but does not provide load-balancing. Cisco Advanced Services does not recommend PBR as intercept method as it adds complexity for maintainability and troubleshooting.</span><br />
<span style="font-size: large;">I have seen issues with this, as this require switch TCAM programming only , which sometimes require lots of memory .</span><br />
<span style="font-size: large;"><br /></span>
<h4 style="text-align: left;">
<span style="font-size: large;">
Web Cache Communication Protocol version 2 (WCCPv2)</span></h4>
<span style="font-size: large;">All WAAS devices (appliances and network modules) support WCCPv2, which provides an off-path but virtually in-line deployment. With WCCPv2, WAE devices are deployed as appliances (nodes on the network and not physically in-line) on the network. WCCPv2 provides scalability to 32 WAE devices in a service group, load-balancing amongst WAEs, fail-through operation if all WAEs are unavailable, and allows the administrator to dynamically add or remove WAE devices to the cluster with little to no disruption.</span><br />
<span style="font-size: large;"><br /></span>
<h4 style="text-align: left;">
<span style="font-size: large;">
Cisco Application Control Engine (ACE)</span></h4>
<span style="font-size: large;">WAE appliances (not applicable to the router-integrated network module) can be integrated into the network using the Cisco ACE appliance or module for the Catalyst 6500. Using ACE, Cisco WAEs are</span><br />
<span style="font-size: large;">deployed as appliances (nodes on the network and not physically in-line) and are configured as part of a server-farm within the ACE configuration. As of today, ACE provides ultra-high levels of scalability - up to 64Gbps of load-balanced throughput in a single chassis, up to 16 million TCP connections, and load-balancing for hundreds of WAE devices - and is the premier means of integration into the data center network.</span></div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-79376412492092095182014-05-21T03:42:00.000-07:002014-05-29T04:48:20.455-07:00WAAS Overview<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;">WAAS WAEs are deployed at the edge/field sales offices and core sites at the network entry and exit points. A single WAE is deployed in the field sales office, while more than one WAE is deployed in the core sites for redundancy. WAAS provides transparent optimizations by requiring two WAEs to be in the path of a TCP connection to be optimized. The two WAEs participating at both ends of the network are auto discovered during the TCP three way hand shake, all WAEs sitting in between the paths of the two WAEs will put the TCP session flow in pass through. The auto discovery is performed for each TCP session; any TCP session that is in progress is put in pass through and not optimized.</span><br />
<span style="font-size: large;">For management and monitoring of the WAAS enterprise, WAEs must also be deployed to host the Central Manager application, which is made redundant by using two WAEs.</span><br />
<span style="font-size: large;">WAAS edge and core WAEs relies on network interception and redirection to receive the TCP packets that should be optimized. WCCPv2 is used in the Cisco enterprise to support the interception and redirection of the TCP traffic flows by the router to the WAEs. WCCP redirect lists/ACLs are used on the routers to control the IP subnets and traffic that should be intercepted and redirected to the WAEs. When the packets get redirected to the WAE, the WAE will apply the appropriate optimization based on the application policies.</span><br />
<span style="font-size: large;">Cisco WAAS uses a variety of transport flow optimization (TFO) features to optimize TCP traffic intercepted by the WAAS devices. TFO protects communicating clients and servers from negative WAN conditions, such as bandwidth constraints, packet loss, congestion, and retransmission. TFO includes the following optimization features:</span><br />
<span style="font-size: large;">• Compression Using DRE & LZ techniques</span><br />
<span style="font-size: large;">• Windows Scaling</span><br />
<span style="font-size: large;">• TCP Initial Window Size Maximization</span><br />
<span style="font-size: large;">• Increased Buffering</span><br />
<span style="font-size: large;">• Selective Acknowledgment</span><br />
<span style="font-size: large;">• Binary Increase Congestion (BIC) TCP</span><br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVo1FMv-MqHs34jiHq_FFIxXPGfqt2kdvwVkwtNq4Pym0-RccHvoOYpd1EGQeNFR2GmMq85uPcMy4dOorSkzTU0dn3MT642kavS2ZYvP20qTqqtv-h0o_MatBGag-B4hueqUllTUtH2EA/s1600/WAAS+overview.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVo1FMv-MqHs34jiHq_FFIxXPGfqt2kdvwVkwtNq4Pym0-RccHvoOYpd1EGQeNFR2GmMq85uPcMy4dOorSkzTU0dn3MT642kavS2ZYvP20qTqqtv-h0o_MatBGag-B4hueqUllTUtH2EA/s1600/WAAS+overview.png" height="276" width="640" /></a></div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-56887899141702636692013-12-11T13:40:00.003-08:002014-05-29T04:48:59.180-07:00Troubleshooting asymmetric routing issues in Cisco WAE<div dir="ltr" style="text-align: left;" trbidi="on">
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">See for Current Active Pass-Through Flows
in “</span><span style="font-family: Calibri;">sh</span><span style="font-family: Calibri;">
statistics connection ”</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">There are multiple reasons why the
traffic may be in pass through mode. It may be because of asymmetric routing,
or it may be because of policy or classifier, or may be the traffic is not
being redirected through </span><span style="font-family: Calibri;">WCCP</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Then go and see pass through traffic in </span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-align: center; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Calibri;">#sh statistics pass-through
| </span><span style="font-family: Calibri;">i</span><span style="font-family: Calibri;">
As (In Cisco WAE)</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Asymmetric 1284 88268196</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Which will show you active and closed
connection(1284 active,88268196 closed)</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">If we found active, then the next step is
go and check for what connection this is active.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Calibri;">sh</span><span style="font-family: Calibri;"> statistics connection pass-through
| </span><span style="font-family: Calibri;">i</span><span style="font-family: Calibri;">
As</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">And that’s BINGO!!!!...</span></span></div>
<span style="font-size: large;"><br /></span>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Following the above steps you will be
able to observe that for the given source and destination your WAE is working
or not and if not then is there any issue regarding asymmetric routing.</span></span></div>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-70624900762385966052013-12-11T07:27:00.002-08:002014-05-29T04:49:18.054-07:00Example of an overload condition(On Cisco WAE)<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: Calibri; font-size: large;"><b>Its very easy to identify your WAE is overloaded or not. Just have to run few commands and observe the outputs which are highlighted as below.</b></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large;">#sh
statistics con(On Cisco WAE)</span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<!--[if ppt]--><span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><!--[endif]--></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"><span style="background-color: blue;">Current
Active Optimized Flows:
5960</span><b>-->nearly equal to connection limit</b></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Current Active Optimized TCP Plus
Flows: 5609</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Current Active Optimized TCP Only
Flows: 349</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Current Active Optimized TCP Preposition
Flows: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current
Active Auto-Discovery Flows:
23</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current
Reserved Flows:
40</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current
Active Pass-Through Flows:
1260</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Historical
Flows:
585</span></span></div>
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<!--[if ppt]--><span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><!--[endif]--></span></div>
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<span style="font-size: large;"><span style="font-family: Calibri;">#sh
</span><span style="font-family: Calibri;">tfo</span><span style="font-family: Calibri;">
detail(On Cisco WAE)</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<!--[if ppt]--><span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><!--[endif]--></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Policy Engine </span><span style="font-family: Calibri;">Config</span><span style="font-family: Calibri;">
Item Value </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> ------------------------- ----- </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> State Registered </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Default Action Use Policy </span></span></div>
<span style="font-size: large;"><br /></span>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> <span style="background-color: blue;"> Connection Limit 6000</span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-family: Calibri; font-size: large;"><br /></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Policy Engine Statistics </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
------------------------- </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Session timeouts: 0, Total
timeouts: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Last </span><span style="font-family: Calibri;">keepalive</span><span style="font-family: Calibri;">
received 00.4 </span><span style="font-family: Calibri;">Secs</span><span style="font-family: Calibri;"> ago</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Last registration occurred 417:10:10:06.7 </span><span style="font-family: Calibri;">Days:Hours:Mins:Secs</span><span style="font-family: Calibri;">
ago</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Hits: 1693419791,
Update Released: 886466302</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Active Connections: 5960,
Completed Connections: 476081344</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Drops: 0,
Pre-Resource Counter: 21</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> <span style="background-color: blue;">
Rejected Connection Counts Due To: (Total: 342344669)</span></span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Not Registered : 0,
</span><span style="font-family: Calibri;">Keepalive</span><span style="font-family: Calibri;">
Timeout : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
No License : 0,
Load Level : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> <span style="background-color: blue;">
Connection Limit : 342344669</span>,
Rate Limit : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Minimum TFO : 0,
Resource Manager : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 5.28pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Global </span><span style="font-family: Calibri;">Config</span><span style="font-family: Calibri;"> : 0,
TFO Overload : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Server-Side : 0,
DM Deny : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="text-indent: -0.38in;"><span style="font-family: Arial; mso-special-format: bullet;">•</span></span><span style="font-family: Calibri; text-indent: -0.38in;">
No DM Accept : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-family: Calibri;"><br /></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.6pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
</div>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-62132713792219341622013-12-11T07:19:00.001-08:002014-05-29T04:50:22.005-07:00TFO Troubleshooting(Cisco WAE)<div dir="ltr" style="text-align: left;" trbidi="on">
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 4.8pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">TFO-Transport
</span><span style="font-family: Calibri;">Flow
Optimization; a set of optimizations applied to intercepted traffic by the WAAS
devices </span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 4.8pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The
number of TCP connections, their status, and disposition can give an </span><span style="font-family: Calibri;">indication
</span><span style="font-family: Calibri;">of
the health of the WAAS system in a specific location</span><span style="font-family: Calibri;">.</span></span></div>
<span style="font-size: large;"><br /></span>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 4.8pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The </span><span style="font-family: Calibri; font-weight: bold;">show statistics </span><span style="font-family: Calibri; font-weight: bold;">tfo</span><span style="font-family: Calibri; font-weight: bold;"> </span><span style="font-family: Calibri; font-weight: bold;">detail</span><span style="font-family: Calibri;">command</span><span style="font-family: Calibri;">
provides an indication of the volume, status, and disposition of connections
between a particular WAAS device and other devices in the network</span><span style="font-family: Calibri;">.</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 4.8pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-family: Calibri; font-size: large;"><br /></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 4.8pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-align: center; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Calibri;">#sh
statistics </span><span style="font-family: Calibri;">tfo</span><span style="font-family: Calibri;">
detail(On Cisco WAE)</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Total number of connections : 81350884</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No. of active connections : 578</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No. of pending (to be accepted)
connections : 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No. of bypass connections : 292144</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No. of normal closed conns : 78445114</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No. of reset connections : 2905192</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Socket write failure : 1704</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 2.4pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Socket read failure : 2</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> WAN socket close while waiting to
write : 967</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> AO socket close while waiting to
write : 147326</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> WAN socket error close while waiting to
read : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> AO socket error close while waiting to
read : 1249665</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">WAN
socket unexpected close while waiting to read : 77254</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Exceeded maximum number of supported
connections : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Buffer allocation or manipulation
failed : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Peer received reset from end host : 1427862</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> DRE connection state out of sync : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Memory allocation failed for buffer
heads : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> </span><span style="font-family: Calibri;">Unoptimized</span><span style="font-family: Calibri;">
packet received on optimized side :
412</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Policy Engine Statistics </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> ------------------------- </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Session timeouts: 0, Total timeouts: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Last </span><span style="font-family: Calibri;">keepalive</span><span style="font-family: Calibri;">
received 00.7 </span><span style="font-family: Calibri;">Secs</span><span style="font-family: Calibri;"> ago</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Last registration occurred 84:09:23:33.0 </span><span style="font-family: Calibri;">Days:Hours:Mins:Secs</span><span style="font-family: Calibri;">
ago</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Hits: 424524224, Update
Released: 305682847</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Active Connections: 687, Completed Connections: 161054837</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Drops: 0, Pre-Resource
Counter: 347</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Rejected Connection Counts Due To: (Total:
0)</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Not Registered :
0, </span><span style="font-family: Calibri;">Keepalive</span><span style="font-family: Calibri;">
Timeout : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No License : 0,
Load Level : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Connection Limit :
0, Rate Limit : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Minimum TFO : 0,
Resource Manager : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Global </span><span style="font-family: Calibri;">Config</span><span style="font-family: Calibri;"> : 0,
TFO Overload : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Server-Side : 0,
DM Deny : 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> No DM Accept : 0</span></span></div>
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<!--[if ppt]--><span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><!--[endif]--></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Auto-Discovery Statistics </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> ------------------------- </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Total Connections queued for accept: 81350826</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Connections queuing failures: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Socket pairs queued for accept: 81350826</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> Socket pairs queuing failures: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> AO discovery successful: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;"> AO discovery failure: 0</span></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The No. of active connections field
reports the number of connections that are currently being optimized</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">No. of pending (to be accepted) </span><span style="font-family: Calibri;">connections-</span><span style="font-family: Calibri;">Number
of TCP connections that will be optimized but are currently in the setup stage</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">No. of connections closed </span><span style="font-family: Calibri;">normally-</span><span style="font-family: Calibri;">Number
of optimized connections closed without any issues using TCP FIN</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">No. of connections closed with </span><span style="font-family: Calibri;">error-</span><span style="font-family: Calibri;">Number
of optimized connection closed with some issues or using TCP RST</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">DRE decode </span><span style="font-family: Calibri;">failure-</span><span style="font-family: Calibri;">DRE
internal error while decoding data. (Should not happen</span><span style="font-family: Calibri;">.)</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">DRE encode </span><span style="font-family: Calibri;">failure-</span><span style="font-family: Calibri;">DRE
internal error while encoding data. (Should not happen</span><span style="font-family: Calibri;">.)</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Connection </span><span style="font-family: Calibri;">init</span><span style="font-family: Calibri;">
</span><span style="font-family: Calibri;">failure-</span><span style="font-family: Calibri;">Failed
to setup the connection although auto-discovery finished successfully</span><span style="font-family: Calibri;">..</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Peer received reset from end </span><span style="font-family: Calibri;">host-</span><span style="font-family: Calibri;">TCP
RST sent by the server or client. (Can be normal behavior and does not
necessarily indicate a problem</span><span style="font-family: Calibri;">.)</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">In the Policy Engine Statistics section
of the output, the Rejected Connection Counts section show various reasons why
connections have been rejected. The Connection Limit counter reports the number
of times that a connection has been rejected because the maximum number of
optimized connections has been exceeded. If you see a high number here, you
should look into </span><span style="font-family: Calibri; font-weight: bold;">overload conditions</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Calibri;">#</span><span style="font-family: Calibri; font-weight: bold;">sh statistics connection(On Cisco WAE)</span></span></div>
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<!--[if ppt]--><span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><!--[endif]--></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Optimized Flows: 660</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Current Active Optimized TCP Plus Flows: 647</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Current Active Optimized TCP Only Flows: 14</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">
Current Active Optimized TCP Preposition Flows: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Auto-Discovery Flows: 320</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Reserved Flows: 80</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Pass-Through Flows: 4659</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Historical Flows: 687</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">D:DRE,L:LZ,T:TCP Optimization </span><span style="font-family: Calibri;">RR:Total</span><span style="font-family: Calibri;">
Reduction Ratio</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">A:AOIM,C:CIFS,E:EPM,G:GENERIC,H:HTTP,M:MAPI,N:NFS,S:SSL,V:VIDEO</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">ConnID</span><span style="font-family: Calibri;"> Source </span><span style="font-family: Calibri;">IP:Port</span><span style="font-family: Calibri;"> </span><span style="font-family: Calibri;">Dest</span><span style="font-family: Calibri;"> </span><span style="font-family: Calibri;">IP:Port</span><span style="font-family: Calibri;"> </span><span style="font-family: Calibri;">PeerID</span><span style="font-family: Calibri;">
</span><span style="font-family: Calibri;">Accel</span><span style="font-family: Calibri;">
RR </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">983071 172.31.95.8:3732 155.64.28.160:8014 00:21:5e:76:8b:88
TDL 00.0%</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">983196
172.31.113.13:56581
155.64.28.160:8014 00:21:5e:76:8b:88 TDL 00.0%</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">327923
172.21.88.239:60790
155.64.28.32:135 N/A
E 00.0%</span></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Optimized TCP Plus Flows-</span><span style="font-family: Calibri;">they
are all being handled with TFO/DRE/LZ </span><span style="font-family: Calibri;">optimization</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Optimized TCP Only Flows:-</span><span style="font-family: Calibri;">flows
that are optimized by TFO only</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Auto-Discovery Flows:-</span><span style="font-family: Calibri;">displays
flows that have not been fully set up to become optimized flows or pass-through
flows</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The Current Active Pass-Through Flows
counter shows connections that the device has determined to be pass-through or
where the device did not see the SYN, SYN ACK, ACK setup. These flows will not
be counted as optimized flows. For pass-through flows, a device should be able
to handle up to 10 times the number of optimized flows for which it is rated</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The sum of the following three counters
tells you how close the WAE device is to its connection limit:</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Optimized Flows</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Active Auto-Discovery Flows</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Current Reserved Flows (available only in
4.1.5 and later)</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">If this sum is equal to or greater than
the connection limit, the device is in an overload condition</span><span style="font-family: Calibri;">.</span></span></div>
</div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-89845457432810065562013-12-11T07:10:00.000-08:002014-05-29T04:50:39.329-07:00Identify routing loops(On Cisco WAE)<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">If a WAE detects its own ID returned in
the TCP options field, a redirection loop has occurred and results in the
following syslog message</span><span style="font-family: Calibri;">:</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">%WAAS-SYS-3-900000: 137.34.79.11:1192 -
137.34.77.196:139 - </span><span style="font-family: Calibri;">opt_syn_rcv</span><span style="font-family: Calibri;">:
Routing Loop detected - Packet has our own </span><span style="font-family: Calibri;">devid</span><span style="font-family: Calibri;">.
Packet dropped.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">You can search the syslog.txt file for
instances of this error by using the </span><span style="font-family: Calibri; font-weight: bold;">find</span><span style="font-family: Calibri;"> command
as </span><span style="font-family: Calibri;">follows</span></span></div>
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<span style="font-family: Calibri; font-size: large;">#find-pattern match
"Routing Loop" syslog.txt (On Cisco WAE)</span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">As per cisco -</span><span style="font-family: Calibri;">If
you are doing outbound redirection on the router, as traffic leaves the router
it will get redirected back to the WAE, which will reroute the packet out the
router, causing a routing </span><span style="font-family: Calibri;">loop</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">But if we are not using outbound redirection
so we have to study why we are facing this(As far as my practical knowledge says avoid using outbound redirection , it increases your troubleshoting part if loop occurs )</span></span></div>
<span style="font-size: large;"><br /></span>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">I have put this here just to ensure that
there should not be routing loop errors while troubleshooting, it’s a serious
problem.</span></span></div>
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<span style="font-family: Calibri;"><br /></span></div>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-71168388287923659442013-12-11T07:05:00.000-08:002014-05-29T04:49:58.347-07:00Troubleshooting WCCP on the WAE<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">Begin troubleshooting on the WAE by using
the </span><span style="font-family: Calibri; font-weight: bold;">show </span><span style="font-family: Calibri; font-weight: bold;">wccp</span><span style="font-family: Calibri; font-weight: bold;"> services</span><span style="font-family: Calibri;"> command.
You want to see both services 61 and 62 configured, as </span><span style="font-family: Calibri;">follows</span></span></div>
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<b><span style="font-size: large;"><span style="font-family: Calibri;">sh </span><span style="font-family: Calibri;">wccp</span><span style="font-family: Calibri;">
services(On Cisco WAE)</span></span></b></div>
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<span style="font-family: Calibri; font-size: large;">Services configured on this Wide
Area Engine</span></div>
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<span style="font-family: Calibri; font-size: large;"> TCP Promiscuous 61</span></div>
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<span style="font-family: Calibri; font-size: large;"> TCP Promiscuous 62</span></div>
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</div>
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<span style="font-size: large;"><span style="font-family: Calibri;">Next check the WCCP status by using
the </span><span style="font-family: Calibri; font-weight: bold;">show </span><span style="font-family: Calibri; font-weight: bold;">wccp</span><span style="font-family: Calibri; font-weight: bold;"> status</span><span style="font-family: Calibri;"> command.
You want to see that WCCP version 2 is enabled and active as follows</span><span style="font-family: Calibri;">:</span></span></div>
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</div>
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<b><span style="font-size: large;"><span style="font-family: Calibri;">#sh </span><span style="font-family: Calibri;">wccp</span><span style="font-family: Calibri;">
status(On Cisco WAE)</span></span></b></div>
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<span style="font-family: Calibri; font-size: large;">WCCP version 2 is enabled and
currently active</span></div>
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</div>
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<b><span style="font-size: large;"><span style="font-family: Calibri;">sh </span><span style="font-family: Calibri;">wccp</span><span style="font-family: Calibri;">
routers(On Cisco WAE)</span></span></b></div>
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</div>
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<span style="font-family: Calibri; font-size: large;">Router Information for Service: TCP
Promiscuous 61</span></div>
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<span style="font-family: Calibri; font-size: large;"> Routers Seeing this Wide Area Engine(2)</span></div>
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<span style="font-family: Calibri; font-size: large;"> Router Id Sent To</span></div>
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<span style="font-family: Calibri; font-size: large;"> x.x.x.x y.y.y.y</span></div>
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<span style="font-family: Calibri; font-size: large;"> x1.x1.x1.x1 y1.y1.y1.y1</span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-align: center; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><b><span style="font-family: Calibri;">sh </span><span style="font-family: Calibri;">wccp</span><span style="font-family: Calibri;">
</span><span style="font-family: Calibri;">gre(On Cisco WAE)</span></b><span style="font-family: Calibri;"></span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Transparent GRE packets received: 0</span><span style="font-family: Calibri; font-weight: bold;"><-----Increments
for WCCP GRE redirection</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Transparent non-GRE packets
received: 2467369718</span><span style="font-family: Calibri; font-weight: bold;"><-----Increments for WCCP L2 redirection</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Transparent non-GRE non-WCCP packets
received: 0</span><span style="font-family: Calibri; font-weight: bold;"><-----Increments for ACE or PBR
redirection</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Total packets accepted: 892102614</span><span style="font-family: Calibri; font-weight: bold;"><-----Accepted for optimization; peer
WAE found</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Invalid packets received: 7</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets received with invalid
service: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets received on a disabled
service: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets received too small: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to zero TTL: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to bad buckets: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to no redirect
address: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to loopback
redirect: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Pass-through </span><span style="font-family: Calibri;">pkts</span><span style="font-family: Calibri;">
on non-owned bucket: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Connections bypassed due to load: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets sent back to router: 348</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">GRE packets sent to router (not
bypass): 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets sent to another WAE: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">GRE fragments redirected: 140487</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">GRE encapsulated fragments received: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets failed encapsulated
reassembly: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets failed GRE encapsulation: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to invalid </span><span style="font-family: Calibri;">fwd</span><span style="font-family: Calibri;">
method: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to insufficient
memory: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets bypassed, no pending
connection: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Connections bypassed during </span><span style="font-family: Calibri;">wccp</span><span style="font-family: Calibri;">
shutdown: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Connections bypassed due to bypass-list
lookup:0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Conditionally Accepted connections: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Conditionally Bypassed connections: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">L2 Bypass packets destined for
loopback: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets w/WCCP GRE received too
small: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to received on
loopback: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to IP access-list
deny: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets fragmented for bypass: 23</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets fragmented for egress: 0</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packet </span><span style="font-family: Calibri;">pullups</span><span style="font-family: Calibri;">
needed: 28610</span></span></div>
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</div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Packets dropped due to no route
found: 0</span></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-family: Calibri; font-size: large;"><br /></span></div>
<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.36pt; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<div style="direction: ltr; margin-bottom: 0pt; margin-left: 0.38in; margin-top: 3.84pt; text-align: center; text-indent: -0.38in; unicode-bidi: embed; word-break: normal;">
<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">If WCCP redirection is working, either of
the first two counters should be </span><span style="font-family: Calibri;">increment.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The Transparent non-GRE packets received
counter increments for packets that are redirected using the WCCP Layer 2
redirect forwarding method</span><span style="font-family: Calibri;">.</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The Transparent non-GRE non-WCCP packets
received counter increments for packets that are redirected by a non-WCCP
interception method (such as ACE or PBR</span><span style="font-family: Calibri;">).</span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The Total packets accepted counter
indicates packets that are accepted for optimization because auto-discovery
found a peer WAE</span><span style="font-family: Calibri;">.</span></span></div>
</div>
</div>
ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-6599868713037310032013-12-11T06:54:00.001-08:002014-06-04T07:27:13.624-07:00Cisco WAAS (Basic concepts)<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;"><span style="font-family: Calibri;">Watch the complete Video of this section -</span></span><br />
<br />
<iframe allowfullscreen="" frameborder="0" height="315" src="//www.youtube.com/embed/uDII0dHWePU" width="560"></iframe>
<span style="font-size: large;"><span style="font-family: Calibri;"><br /></span></span>
<span style="font-size: large;"><span style="font-family: Calibri;">WAAS is a </span><span style="font-family: Calibri; font-weight: bold;">symmetric
solution </span><span style="font-family: Calibri;">requiring
a WAAS component on both sides of the conversation. Peer-to-peer. WAN traffic
between WAAS components is highly optimized while still visible to </span><span style="font-family: Calibri;">QoS</span><span style="font-family: Calibri;">/Management
applications</span></span><br />
<span style="font-size: large;"><span style="font-family: Calibri;"><br /></span>
<span style="font-family: Calibri;">WAAS devices </span><span style="font-family: Calibri; font-weight: bold;">auto-discover </span><span style="font-family: Calibri;">each
other without any user intervention allowing optimization not only to the data
center but between WAAS enabled branches</span></span><br />
<span style="font-size: large;"><span style="font-family: Calibri;"><br /></span>
</span><br />
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<span style="font-size: large;"><span style="font-family: Calibri;">The WAAS administrator can </span><span style="font-family: Calibri; font-weight: bold;">classify </span><span style="font-family: Calibri;">which
WAN traffic should be optimized based on criteria such as protocol (port
number), source and/or destination IP address and/or network. </span></span></div>
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<span style="font-family: Calibri; font-size: large; font-weight: bold;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Calibri; font-weight: bold;">WAAS </span><span style="font-family: Calibri; font-weight: bold;">Overview
Application Acceleration Transparency</span></span></div>
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<span style="font-family: Calibri; font-size: large; text-indent: -0.38in;">Packet network transparency (L3/L4
headers) allows application acceleration components to maintain compliance with
existing network features</span></div>
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<span style="font-family: Calibri; font-size: large; text-indent: -0.38in;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">WAAS Overview TFO Auto-Discovery – TCP
SYN </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">When the client sends a TCP-SYN packet,
WAE1 will apply TCP options to identify itself and specify the optimizations
that it would like to apply </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The modified TCP-SYN packet is then
forwarded to the server, and intercepted on the other side </span></span></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctGSeLatHtLO6aEa49VM1NscfxT_bgew8MrxTZs6uAER2Lo2SXyxTFF87_DigKkIqZNDhQ0_QUdOTPqwUuNGwHlDJkb1gSJsZRUPy53_cHJfsFhoyLf9KUVL8FKjfau0NN4e8rwgqZpk/s1600/WAAS1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctGSeLatHtLO6aEa49VM1NscfxT_bgew8MrxTZs6uAER2Lo2SXyxTFF87_DigKkIqZNDhQ0_QUdOTPqwUuNGwHlDJkb1gSJsZRUPy53_cHJfsFhoyLf9KUVL8FKjfau0NN4e8rwgqZpk/s400/WAAS1.png" height="225" width="400" /></span></a></div>
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<span style="font-family: Calibri; font-size: large;"><br /></span></div>
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<span style="font-family: Calibri; font-size: large; font-weight: bold;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">WAAS Overview TFO Auto-Discovery – TCP
SYN (Cont.) </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">Once WAE2 receives the TCP-SYN packet
with the options marked, it then knows WAE1’s details and desire to optimize
this connection </span></span></div>
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<span style="font-size: large;"><span style="text-indent: -0.38in;"><span style="font-family: Arial; mso-special-format: bullet;">•</span></span><span style="font-family: Calibri; text-indent: -0.38in;">The TCP-SYN packet is then forwarded to
the server</span><span style="font-family: Calibri; font-weight: bold;"> </span></span></div>
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<span style="font-family: Calibri; font-size: large; font-weight: bold;"><br /></span></div>
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">WAAS Overview TFO Auto-Discovery – TCP
SYN-ACK </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">When the server responds with the TCP
SYN-ACK, WAE2 then marks TCP options to acknowledge optimization and to
identify itself to WAE1 </span></span></div>
<span style="font-family: Calibri; font-size: large;">The
marked TCP SYN-ACK packet is then forwarded towards the client and intercepted
on the other side</span></div>
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri; font-weight: bold;">WAAS Overview TFO Auto-Discovery –
TCP SYN-ACK (Cont.) </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">When WAE1 receives the TCP SYN-ACK with
the optimization confirmation and details about WAE2, the defined policy (or
negotiated optimizations) can then be acknowledged </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">The TCP SYN-ACK packet is then forwarded
to the client</span><span style="font-family: Calibri;"> </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial;">•</span><span style="font-family: Calibri;">WAAS Overview TFO Auto-Discovery – TCP
ACK </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">After the SYN-ACK is received, the TCP
proxy is initiated for the connection, and WAE1 sends a TCP ACK to WAE2 to
acknowledge optimizations </span></span></div>
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<span style="font-size: large;"><span style="font-family: Arial; mso-special-format: bullet;">•</span><span style="font-family: Calibri;">WAE2 can then send a TCP ACK to Server B </span></span></div>
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<span style="font-family: Calibri;"><span style="font-size: large; text-indent: -0.38in;">Client
A sends a TCP ACK to WAE1</span></span></div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com2tag:blogger.com,1999:blog-481832570095352276.post-43552441242616901422013-12-11T06:30:00.002-08:002013-12-11T06:41:41.324-08:00TCP(SYN and RST,ACK flags scenario )<div dir="ltr" style="text-align: left;" trbidi="on">
TCP Analysis Based on Flags<br />
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In this post we will try to understand the if there is no communication between client and servers which are in some VMs and on some registered ports.</div>
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If we have tested up till layer 3 that there is no issue in PING and TRACE between the source and destination and still communication is not happening now the role of understanding TCP Packet capture comes into picture.</div>
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There may be many reasons of this , what i am discussing here is one of them and mostly which i have handled.</div>
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I asked to get a TCP dump from both source and destination machine.</div>
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When i read a TCP dump in wireshark what i observe is: I am seeing lots of TCP re-transmissions for SYN packet and reply is coming as RST, ACK . Like as below.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpzRAJJN50ZDfK7qJx2AnVJ4y8HAmVxUxRCPxl0w7OZU7FHi1EIdD7829ypjTDJJIhaolO4DQPg2ZhZho-MTj6gsEaD83ic2UOhh9VJ23zE2VcLKl_vmpEf8F5_BY4cEtaH4LjatXX0pI/s1600/Capture.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="15" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpzRAJJN50ZDfK7qJx2AnVJ4y8HAmVxUxRCPxl0w7OZU7FHi1EIdD7829ypjTDJJIhaolO4DQPg2ZhZho-MTj6gsEaD83ic2UOhh9VJ23zE2VcLKl_vmpEf8F5_BY4cEtaH4LjatXX0pI/s400/Capture.JPG" width="400" /></a></div>
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This is very interesting , if we have a good understanding of these TCP flags we will able to identify the issue otherwise we will keep this on troubleshooting from the network side and will never be able to identify the issue . Lets see when this RST , ACK flags came and what does this mean.</div>
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<li>The ACKnowledgement flag is used to acknowledge the successful receipt of packets. </li>
<li>The reset flag is used when a segment arrives that is not intended for the current connection</li>
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Analysis RST/ACK<br />
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<li>A closed port will send back a RST/ACK to a TCP request</li>
<li>If a worm is scanning a large block of living hosts, those hosts with closed ports would send back a RST/ACK</li>
<li>If a destination host receives too many RST/ACK responses, this destination IP is very likely infected with a worm</li>
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So if we conclude , what the above concepts says and what the issue we are facing , we can surely say that the source is trying establish a connection by sending the SYN packet and the destination is not listening on that port or that port is closed , that is why the destination is sending the RST,ACK in reply of that syn packet.</div>
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1 more thing if we want to see the RST , ACK is of the which SYN packet , we can get into the detail of that packet and in the last you will observe the "This is an ACK of the segment in frame xyz" , so in this way we can observe that for each SYN frame reply is RST,ACK of that frame. Below is the capture what we will see in the detail of RST,ACK</div>
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Hope this post helps , whenever someone comes across like this type of scenario.</div>
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Thanks</div>
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All comments are welcome.</div>
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com0tag:blogger.com,1999:blog-481832570095352276.post-60929214627483261312013-10-20T15:53:00.000-07:002014-05-29T05:03:01.736-07:00About My Blog<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;">This blog is made with the intention for people who are in the field of Networking ,so that they will get in depth understanding of network ,that may be regarding any concepts ,real world experience or troubleshooting the Networks(which presently i am handling) .</span><br />
<span style="font-size: large;">In this blog i will not discuss those things which are already available in the internet. </span><br />
<span style="font-size: large;">I will try to put those concepts of networking or those topics which is really required from the industry point of view.</span><br />
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ANIMESH KHAREhttp://www.blogger.com/profile/08151013124521463861noreply@blogger.com1