{"id":1087,"date":"2018-04-25T14:41:19","date_gmt":"2018-04-25T12:41:19","guid":{"rendered":"http:\/\/www.quisted.net\/?p=1087"},"modified":"2018-05-25T12:13:28","modified_gmt":"2018-05-25T12:13:28","slug":"dc-nx-os-overlay-transport-virtualization","status":"publish","type":"post","link":"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/","title":{"rendered":"[DC] NX-OS &#8211; Overlay Transport Virtualization"},"content":{"rendered":"<p><a href=\"https:\/\/www.quisted.net\/arc\/datacenterdesign\/lab-v-nexus7k-overlay-transport-virtualization\/\">https:\/\/www.quisted.net\/arc\/datacenterdesign\/lab-v-nexus7k-overlay-transport-virtualization\/<\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#What_is_OTV\" >What is OTV:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_was_designed_for_Layer_2_DCI\" >OTV was designed for Layer 2 DCI<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_benefits\" >OTV benefits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_Control_Plane\" >OTV Control Plane<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_Data_Plane\" >OTV Data Plane<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_DCI_Optimizations\" >OTV DCI Optimizations<\/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.quisted.net\/index.php\/2018\/04\/25\/dc-nx-os-overlay-transport-virtualization\/#OTV_Configuration\" >OTV Configuration:<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_is_OTV\"><\/span><span style=\"color: #993366;\"><strong>What is OTV:<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Layer 2 VPN over IPv4<\/li>\n<li>Used over the DCI to extend VLANs between datacenter sites<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_was_designed_for_Layer_2_DCI\"><\/span><span style=\"color: #993366;\"><strong>OTV was designed for Layer 2 DCI<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Optimizes ARP Flooding over DCI<\/li>\n<li>Does not extend STP domain<\/li>\n<li>Can overlay multiple VLANs without complicated design<\/li>\n<li>Allows multiple edge routers without complicated design<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_benefits\"><\/span><strong><span style=\"color: #993366;\">OTV benefits<\/span><br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Provides a flexible overlay VPN on top of without restrictions for the IP nework<\/li>\n<li>L2 transports leveraging the transport IP network capabilities<\/li>\n<li>Provides a virtual multi-access L2 network that supports efficient transport of unicast, multicast and broadcast traffic<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_Control_Plane\"><\/span><strong><span style=\"color: #993366;\">OTV Control Plane<\/span><br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Uses IS-IS to advertise MAC addresses between AEDs\n<ul>\n<li>&#8220;Mac in IP&#8221; Routing<\/li>\n<\/ul>\n<\/li>\n<li>Encapsulated as Control Group Multicast\n<ul>\n<li>Implies that DCI Must support ASM Multicast<\/li>\n<li>Can be encapsulated as Unicast with OTV Adjacency Server<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_Data_Plane\"><\/span><span style=\"color: #993366;\"><strong>OTV Data Plane<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Uses both Unicast and Multicast Transport<\/li>\n<li>Multicast Control Group\n<ul>\n<li>Multicast or Broadcast Control Plane Protocols<\/li>\n<li>eg. ARP, OSPF, EIGRP etc<\/li>\n<\/ul>\n<\/li>\n<li>Unicast Data\n<ul>\n<li>Normal Unicast is encapsulated as Unicast between AEDs<\/li>\n<\/ul>\n<\/li>\n<li>Multicast Data Group\n<ul>\n<li>Multicast data flows are encapsulated as SSM Multicast<\/li>\n<li>Implies AED use IGMPv3 for (S,G) joins<\/li>\n<\/ul>\n<\/li>\n<li>OTV Adjacency Server can remove requirement for Multicast completely\n<ul>\n<li>Will result in Head End Replication when more than 2 DC&#8217;s connected over the DCI<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_DCI_Optimizations\"><\/span><strong><span style=\"color: #800080;\">OTV DCI Optimizations<\/span><br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Other DCI options bridge all traffic over DCI\n<ul>\n<li>eg. STP, ARP, Broadcast storms etc<\/li>\n<\/ul>\n<\/li>\n<li>OTV reducdes unnecessary flooding by:\n<ul>\n<li>Proxy ARP\/ICMPv6 ND Cache on AED<\/li>\n<li>Assumption is that hosts are bi-directional (not silent)<\/li>\n<li>Inital ARPs are flooded, then cache is used<\/li>\n<li>Terminating the STP Domain on AED.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"OTV_Configuration\"><\/span><span style=\"color: #800080;\"><strong>OTV Configuration:<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>&nbsp;<\/p>\n<p>License needed:<\/p>\n<p><a href=\"http:\/\/vps.quisted.net\/wp-content\/uploads\/2018\/04\/OTV.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1096\" src=\"http:\/\/vps.quisted.net\/wp-content\/uploads\/2018\/04\/OTV.png\" alt=\"\" width=\"862\" height=\"272\" srcset=\"https:\/\/www.quisted.net\/wp-content\/uploads\/2018\/04\/OTV.png 862w, https:\/\/www.quisted.net\/wp-content\/uploads\/2018\/04\/OTV-300x95.png 300w, https:\/\/www.quisted.net\/wp-content\/uploads\/2018\/04\/OTV-768x242.png 768w\" sizes=\"auto, (max-width: 862px) 100vw, 862px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/www.quisted.net\/arc\/datacenterdesign\/lab-v-nexus7k-overlay-transport-virtualization\/ What is OTV: Layer 2 VPN over IPv4 Used over the DCI to extend VLANs between datacenter sites OTV was designed for Layer 2 DCI Optimizes ARP Flooding over DCI Does not extend STP domain Can overlay multiple VLANs without complicated design Allows multiple edge routers without complicated design OTV benefits Provides a flexible [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[3],"tags":[71,74],"class_list":["post-1087","post","type-post","status-publish","format-standard","hentry","category-dc","tag-nexus","tag-otv"],"_links":{"self":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts\/1087","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/comments?post=1087"}],"version-history":[{"count":2,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts\/1087\/revisions"}],"predecessor-version":[{"id":1172,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts\/1087\/revisions\/1172"}],"wp:attachment":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/media?parent=1087"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/categories?post=1087"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/tags?post=1087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}