BGP

Learn about the Border Gateway Protocol!

BGP

border gateway protocol

BGP speaker

a node that exchanges BGP messages with other BGP speakers in other networks

what is BGP

path-vector protocol - BGP messages contain the complete routes that the BGP speaker’s network makes available

why is advertising complete paths essential?

allows for routing loops to be detected, allows per-AS policy to be applied

BGP speakers in different ASes do what

open BGP sessions with each other

when links or policies change, what do BGP speakers do

exchange update packets to advertise new routes or withdraw old ones

iBGP (interior BGP)

routers inside a network construct a mesh of iBGP sessions between themselves and the border routers to provide routes outside of the network