{"id":649,"date":"2018-10-29T21:05:55","date_gmt":"2018-10-29T21:05:55","guid":{"rendered":"http:\/\/feralpacket.org\/?p=649"},"modified":"2018-10-29T21:05:55","modified_gmt":"2018-10-29T21:05:55","slug":"bgp-as-the-pe-ce-protocol-notes","status":"publish","type":"post","link":"https:\/\/feralpacket.org\/?p=649","title":{"rendered":"BGP as the PE &#8211; CE Protocol Notes"},"content":{"rendered":"<p><span style=\"font-weight: bold;\">BGP as the PE &#8211; CE Protocol<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/feralpacket.org\/wp-content\/uploads\/2018\/10\/0fbdc295815a288fe486aad4f1f4cd1b.jpeg\" style=\"\" width=\"600\" height=\"\"\/><\/p>\n<p>When R1 sends an update to R4 with R5&#8217;s information, the update will include AS 50 in the AS-PATH. \u00a0R4 will see 50 in the AS-PATH and drop the update. \u00a0There are two solutions that will allow R4 to accept the update.<\/p>\n<p>\u00a0&#8211; osi<\/p>\n<p>\u00a0 \u00a0 \u00a0-&gt; PE side solution<\/p>\n<p>\u00a0&#8211; allowas-in<\/p>\n<p>\u00a0 \u00a0 \u00a0-&gt; CE side solution<\/p>\n<p>R1(config)# <span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">ip vrf c1b1<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">rd 1:1<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">route-target both 1:1<\/span><\/p>\n<p><span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">int s0\/0<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">ip vrf forwarding c1b1<\/span><\/p>\n<p><span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">router bgp 100<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 3.3.3.3 remote-as 100<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 3.3.3.3 update-source lo0<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">address-family vpnv4 unicast<\/span><\/p>\n<p>\u00a0 <span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 3.3.3.3 activate<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">address-familty ipv4 vrf c1b1<\/span><\/p>\n<p>\u00a0 <span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 14.0.0.1 remote-as 50<\/span><\/p>\n<p>\u00a0 <span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 14.0.0.1 as-override<\/span><\/p>\n<p>\u00a0 \u00a0 \u00a0-&gt; PE side solution<\/p>\n<p>R4(config)# <span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">router bgp 50<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 14.0.0.1 remote-as 100<\/span><\/p>\n<p>\u00a0<span style=\"background-color: rgb(255, 250, 165);-evernote-highlight:true;\">neighbor 14.0.0.1 allowas-in<\/span><\/p>\n<p>\u00a0 \u00a0 \u00a0-&gt; CE side solution<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BGP as the PE &#8211; CE Protocol<\/p>\n","protected":false},"author":1,"featured_media":648,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[39,33,32,31],"class_list":["post-649","post","type-post","status-publish","format-standard","hentry","category-ccie","tag-bgp","tag-l3vpn","tag-mpls","tag-published"],"_links":{"self":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=649"}],"version-history":[{"count":1,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/649\/revisions"}],"predecessor-version":[{"id":739,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/649\/revisions\/739"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/media\/648"}],"wp:attachment":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}