BGP (Border Gateway Protocol) is the routing protocol of the Internet, and because of the size of the global network, it is also the slowest.<\/p>\n
It does not see each and all routers of the internet, but it knows how to get to ‘autonomous systems’, which means big network pools. Internet service providers are autonomous systems, big companies as Microsoft and Google are also autonomous systems.<\/p>\n
This post is just for your information and will only assume the ISP configuration below that runs BGP and then joint the price network router to this BGP network:<\/p>\n
hostname ISP\r\nno ip domain-lookup\r\ninterface L0\r\nip address 10.10.10.10<\/strong> 255.255.255.255\r\ninterface Serial0\/0\/1\r\nip address 200.200.200.1<\/strong> 255.255.255.252\r\nno shut\r\nip route 0.0.0.0 0.0.0.0 l0\r\nrouter bgp 65001\r\nbgp log-neighbor-changes\r\nnetwork 0.0.0.0\r\nneighbor 200.200.200.2<\/strong> remote-as 65000\r\nend<\/pre>\nNote: 10.10.10.10<\/strong> just simulate the Internet in the ISP, 200.200.200.1<\/strong> is the router address in the ISP network, 200.200.200.2<\/strong> is the address of your network that is connected to the ISP (which means that the ISP router needs to be set to exchange routing information to your network).<\/p>\n
Join your router to the ISP BGP network:<\/p>\n
router bgp 65000\r\nneighbor 200.200.200.1<\/strong> remote-as 65001\r\nnetwork 200.100.100.0<\/strong> mask 255.255.255.0<\/pre>\nNote: 200.200.200.1<\/strong> is the ISP address and 200.100.100.0<\/strong> is the internal network you will advertise on the internet through the ISP router.<\/p>\n
Useful command for troubleshooting:<\/p>\n
show ip route\r\nshow ip bgp\r\nshow ip bgp summary<\/pre>\nThis post is just a quick reference guide for commands and I made it from the Cisco Lab 3.5.3.5. Consider searching for and reading the source material for additional information.<\/p>\n","protected":false},"excerpt":{"rendered":"
BGP (Border Gateway Protocol) is the routing protocol of the Internet, and because of the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-595","post","type-post","status-publish","format-standard","hentry","category-ccna"],"_links":{"self":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/595","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=595"}],"version-history":[{"count":4,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/595\/revisions"}],"predecessor-version":[{"id":1420,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/595\/revisions\/1420"}],"wp:attachment":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=595"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=595"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}