{"id":511,"date":"2018-01-12T12:09:29","date_gmt":"2018-01-12T11:09:29","guid":{"rendered":"http:\/\/www.quisted.net\/?p=511"},"modified":"2018-01-12T12:09:29","modified_gmt":"2018-01-12T11:09:29","slug":"eigrp-design","status":"publish","type":"post","link":"https:\/\/www.quisted.net\/index.php\/2018\/01\/12\/eigrp-design\/","title":{"rendered":"Routing Design Principles (EIGRP, OSPF, BGP)"},"content":{"rendered":"<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\/01\/12\/eigrp-design\/#EIGRP_design_principles\" >EIGRP design principles<\/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\/01\/12\/eigrp-design\/#Multiple_EIGRP_design_principles\" >Multiple EIGRP design principles<\/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\/01\/12\/eigrp-design\/#OSPF_design_principles\" >OSPF design principles<\/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\/01\/12\/eigrp-design\/#BGP_design_principles\" >BGP design principles<\/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\/01\/12\/eigrp-design\/#All_Routing_protocols\" >All Routing protocols<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"EIGRP_design_principles\"><\/span><span style=\"color: #3366ff;\">EIGRP design principles<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>EIGRP works for arbitrary topologies for small to medium networks.<\/li>\n<li>A flat EIGRP network doesn&#8217;t really scale beyond 400 routers and will lead to performance issuse\n<ul>\n<li>How to solve this?\n<ul>\n<li>Stub areas, summerization, route filtering limits the query scope<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>If EIGRP doesn&#8217;t have a feasible successor it will query all it&#8217;s neighbours.\n<ul>\n<li>&#8220;I don&#8217;t have a route anymore, don&#8217;t route through me, give me a viable route&#8221;.<\/li>\n<\/ul>\n<\/li>\n<li>BFD to optimize convergence (100ms wtih 1000 routes).<\/li>\n<li><strong><span style=\"color: #3366ff;\">2 second hello<\/span><\/strong> timer, <strong><span style=\"color: #339966;\">6 second hold<\/span><\/strong> timer ( recommended )<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Multiple_EIGRP_design_principles\"><\/span>Multiple EIGRP design principles<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Used to merge two networks ( Acquisitions )<\/li>\n<li>Different administrative groups in a company<\/li>\n<li>a way to devide large networks ( and control queries )<\/li>\n<li>Routes are distributed between AS ( don&#8217;t loop! )<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h3><span class=\"ez-toc-section\" id=\"OSPF_design_principles\"><\/span><span style=\"color: #3366ff;\">OSPF design principles<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Number of neighbouring routers ( no more than<span style=\"color: #ff0000;\"><strong> 60<\/strong> <\/span>).<\/li>\n<li>Number of routers in an area ( no more than<span style=\"color: #ff0000;\"><strong> 50<\/strong> <\/span>).<\/li>\n<li>Number of areas connected to a router ( no more than<span style=\"color: #ff0000;\"> <strong>3<\/strong><\/span> ).\n<ul>\n<li>LSDB has to be maintained for all area&#8217;s<\/li>\n<\/ul>\n<\/li>\n<li>The router acting as the DR ( best router).<\/li>\n<li>Ammount of data in an area impatcs OPSF performance\n<ul>\n<li>Summarize<\/li>\n<li>Stub \/ Total stub<\/li>\n<\/ul>\n<\/li>\n<li>Areas should be designed around geography and functional boundries<\/li>\n<li>Summarization minimizes route change (flapping) impact<\/li>\n<li>Large networks only have ARBS in AREA 0<\/li>\n<li>Contigious splitable adressing<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"BGP_design_principles\"><\/span><span style=\"color: #3366ff;\">BGP design principles<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>BGP as IGP:<\/strong>\n<ul>\n<li><strong><span style=\"color: #339966;\">Advantages:\u00a0<\/span> <\/strong>\n<ul>\n<li>Vendor interoperability<\/li>\n<li>per-hop traffic engineering,<\/li>\n<li>unequal-cost loadbalancing \/ anycast routing<\/li>\n<li>simpler troubleshouting (as-path)<\/li>\n<li>reduced flooding<\/li>\n<li>Trust border controll<\/li>\n<\/ul>\n<\/li>\n<li><span style=\"color: #ff0000;\"><strong>Disadvantages<\/strong><\/span>:\n<ul>\n<li>Default timers are very slow<\/li>\n<li>Not available on low-end routers (layer 3 switches)<\/li>\n<li>Not as dynamic<\/li>\n<li>Full mesh requirement<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Route Reflector design<\/li>\n<li>Confederate design<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"All_Routing_protocols\"><\/span><span style=\"color: #3366ff;\">All Routing protocols<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>All routing protocols must detect, propagate, process and update.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>EIGRP design principles EIGRP works for arbitrary topologies for small to medium networks. A flat EIGRP network doesn&#8217;t really scale beyond 400 routers and will lead to performance issuse How to solve this? Stub areas, summerization, route filtering limits the query scope If EIGRP doesn&#8217;t have a feasible successor it will query all it&#8217;s neighbours. [&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":[2,5],"tags":[],"class_list":["post-511","post","type-post","status-publish","format-standard","hentry","category-arc","category-designprinciples"],"_links":{"self":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts\/511","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=511"}],"version-history":[{"count":0,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/posts\/511\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/media?parent=511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/categories?post=511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.quisted.net\/index.php\/wp-json\/wp\/v2\/tags?post=511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}