{"id":830,"date":"2014-03-01T00:00:00","date_gmt":"2014-03-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2014\/03\/01\/brocade-adx-the-csw-pseudo-stack\/"},"modified":"2023-01-15T22:53:29","modified_gmt":"2023-01-15T22:53:29","slug":"brocade-adx-the-csw-pseudo-stack","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html","title":{"rendered":"Brocade ADX &#8211; The CSW Pseudo Stack"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6622d1350a819\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6622d1350a819\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Purpose\" title=\"Purpose\">Purpose<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Summary\" title=\"Summary\">Summary<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Client_Side\" title=\"Client Side\">Client Side<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Server_Side\" title=\"Server Side\">Server Side<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Troubleshooting\" title=\"Troubleshooting\">Troubleshooting<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Methodology\" title=\"Methodology\">Methodology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Show_Commands\" title=\"Show Commands\">Show Commands<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Solutions\" title=\"Solutions\">Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\/#Reference\" title=\"Reference\">Reference<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Purpose\"><\/span><strong>Purpose<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The purpose of this document is to explain the role and functions of the CSW Pseudo Stack.<\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span><strong>Summary<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Within the Brocade ADX feature set is the ability to forward traffic based on layer 7 attributes (such as host header, URI etc.). This is achieved by enabling content switching (CSW).<\/p>\n<p>In order for the the ADX to perform Layer 7 content switching (CSW), the content switching engine must hold the entire client request within its buffer before it can making a forwarding decision. As, in some instances the clients request may be split across multiple packets, the ADX must buffer each client request packet in order to construct the entire client request. To achieve this a buffering layer within CSW is used called the CSW Pseudo Stack.<\/p>\n<p><em><strong>Note<\/strong> : When enabling CSW on a virtual server, the CSW Pseudo Stack is only used if the virtual server port is pass-through only (i.e non-proxy based). Proxy ports include SSL termination, SSL proxy or tcp-proxy enabled.<br \/>\n<\/em><\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Client_Side\"><\/span><strong>Client Side<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In some instances a clients request may span multiple packets. Because of this the ADX will acknowledge (ACK) each packet until the complete request is fully received (buffered). The layer 7 forwarding decision is then made. However, due to the CSW Pseudo Stack not keeping a copy of each packet once it has been sent out, should any of the packets fail to reach the server the ADX would be unable to re-transmit the necessary TCP segment(s).<\/p>\n<p>Within 12.4.00c the ability to buffer each client packet until the server had successfully acknowledged delivery was added. Though this feature is not enabled by default, typically the chance of the packet loss between the ADX and server on a LAN based link is relatively low, in comparison with the overhead required to buffer each packet when enabling this feature. To enable this feature the command &#8216;<strong>server csw enable-retransmission&#8217;<\/strong> is used.<\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Server_Side\"><\/span><strong>Server Side<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>TCP segments sent from the server to the ADX must arrive in sequence. Segments that do not, are slightingly dropped. However from 12.4.00c onwards the ADX supports both packet-drops and out-of-sequence segments. Again, this is achieved by the ADX buffering each packet until the client has successfully acknowledged delivery.<\/p>\n<p><em><strong>Note :<\/strong> Within 12.4.00h I have seen instances where the Pseudo Stack has not forwarded out of sequence (i.e TCP retransmitted) packets from the server. To resolve this, the Pseudo Stack was bypassed by *enabling the port as proxy based via the command &#8216;<strong>port http tcp-proxy<\/strong>&#8216;.\u00a0<\/em><\/p>\n<p><em>* enabling a port as proxy mode adds additional resource overhead to the appliance and should be added with caution.<\/em><\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Troubleshooting\"><\/span><strong>Troubleshooting<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Methodology\"><\/span>Methodology<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To confirm that your issue is CSW based, first check if the connection works when going directly to the webserver. If the connection works when going direct create a test virtual server and disable CSW. Test the connection again, but this time to the test virtual server. If the connection works then troubleshooting should be centred towards CSW.<\/p>\n<p><em><strong>Note<\/strong> : For general CSW troubleshooting steps please see <a href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-debugging-csw.html\">here<\/a>.<\/em><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Show_Commands\"><\/span>Show Commands<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Based on the caveats outlined earlier in this article the following command is useful for highlighting issues around either packet loss or out-of-sequence packets.<\/p>\n<pre>SSH@ADX#show server proxy keep-alive\r\nKeep-alive connection statistics:\r\n\u00a0\r\nServer-side statistics:\r\n\u00a0\u00a0\u00a0 In seq. packets\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Out of seq. packets\u00a0 =\u00a0\u00a0\u00a0\u00a0 237656\r\n\u00a0\u00a0\u00a0 Fwd exp-seq-wrap ret =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Drop wrapped old ret =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\u00a0\u00a0\u00a0 Retransmit packets\u00a0\u00a0 =\u00a0\u00a0 22232074\u00a0\u00a0 Unmatched reverse\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\u00a0\u00a0\u00a0 Fwd wrapped retrans\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Drop old retrans\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0 37158\r\n\u00a0\u00a0\u00a0 Invalid data in wait =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Tcb in mem error\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\u00a0\u00a0\u00a0 No tcb on reverse\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Non-conn tcb in ack\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\u00a0\u00a0\u00a0 Invalid tcb on clien =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Unexpected resp data =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\u00a0\u00a0\u00a0 Unexpected server ac =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0 Src-Nat out of port\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0<\/pre>\n<p>(outputt omitted&#8230;)<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Solutions\"><\/span>Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Based on the issues described previously in this article there are 4 main solutions,<\/p>\n<ul>\n<li>Should the issue be down to packet loss between the ADX and server, then upgrade to 12.4.00c and enable &#8216;<strong>server csw enable-retransmission<\/strong>&#8216;.<\/li>\n<li>Fix the packet loss in question (on either the server or client side, or both).<\/li>\n<li>Disable and remove CSW from the binding port on the virtual server.<\/li>\n<li>Change the port from pass-through to proxy by using the command &#8216;<strong>port &lt;port&gt; tcp-proxy<\/strong>&#8216;. In turning negating the CSW Pseudo Stack. However be aware that this does add additional load to the ADX, and should be added with care.<\/li>\n<\/ul>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Reference\"><\/span><strong>Reference<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"http:\/\/www.brocade.com\/downloads\/documents\/html_product_manuals\/SIADX_12500_SLBG\/wwhelp\/wwhimpl\/common\/html\/wwhelp.htm#href=l7sw.07.11.html&amp;single=true\">www.brocade.com\/downloads\/documents\/html_product_manuals\/SIADX_12500_SLBG\/wwhelp\/wwhimpl\/common\/html\/wwhelp.htm#href=l7sw.07.11.html&amp;single=true<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Purpose The purpose of this document is to explain the role and functions of the CSW Pseudo Stack. Summary Within the Brocade ADX feature set is the ability to forward traffic based on layer 7 attributes (such as host header, URI etc.). This is achieved by enabling content switching (CSW). In order for the the &#8230; <a title=\"Brocade ADX &#8211; The CSW Pseudo Stack\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/Brocade\/brocade-adx-the-csw-pseudo-stack.html\" aria-label=\"Read more about Brocade ADX &#8211; The CSW Pseudo Stack\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Brocade ADX - The CSW Pseudo Stack - Fir3net<\/title>\n<meta name=\"description\" content=\"Purpose The purpose of this document is to explain the role and functions of the CSW Pseudo Stack. 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