{"id":1165,"date":"2018-02-18T21:22:25","date_gmt":"2018-02-18T21:22:25","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2018\/02\/18\/bgp-messages-and-adjacency-states\/"},"modified":"2021-07-27T19:54:17","modified_gmt":"2021-07-27T19:54:17","slug":"bgp-messages-and-adjacency-states","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Networking\/Protocols\/bgp-messages-and-adjacency-states.html","title":{"rendered":"BGP – Messages and Adjacency States"},"content":{"rendered":"
Within BGP (as per RFC 1771) there are four BGP message types. They are,<\/p>\n
Just like OSPF or EIGRP, BGP establishes a neighbor adjacency with other routers before any routing information is exchanged. However BGP does not use broadcast or multicast for BGP neighbor discovery, instead, neighbors are configured manually, using TCP\/179 for communication.<\/p>\n
In order for two BGP systems to become neighbors, they will go through a series of BGP Neighbor Adjacency States. They are:<\/p>\n
Figure 1<\/strong> – BGP States.\u00a0 [2] <\/a> <\/sup><\/p>\n [1] <\/a> “BGP – Cisco.” 8 Dec. 1999, https:\/\/www.cisco.com\/cpress\/cc\/td\/cpress\/fund\/ith2nd\/it2435.htm <\/a> . Accessed 3 Nov. 2017. BGP Messages Within BGP (as per RFC 1771) there are four BGP message types. They are, OPEN – Used to open a BGP communication session between peers. This is the first message sent by each side once the 3WHS is complete, and can be thought of as a HELLO. Only once each side has confirmed … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":1164,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1265],"tags":[],"yoast_head":"\nReferences<\/h2>\n
\n [2] <\/a> “BGP Neighbor Adjacency States | NetworkLessons.com.” 2 Apr. 2015, https:\/\/networklessons.com\/bgp\/bgp-neighbor-adjacency-states\/ <\/a> . Accessed 18 Feb. 2018.<\/p>\n","protected":false},"excerpt":{"rendered":"