How BGP Works
BGP is a path vector protocol used to carry routing information between autonomous systems. The term path vector comes from the fact that BGP routing information carries a sequence of AS numbers that identifies the path of ASs that a network prefix has traversed. The path information associated with the prefix is used to enable loop prevention.
BGP uses TCP as its transport protocol (port 179). This ensures that all the transport reliability (such as retransmission) is taken care of by TCP and does not need to be implemented in BGP, thereby simplifying the complexity associated with designing reliability into the protocol itself.
Routers that run a BGP routing process are often referred to as BGP speakers. Two BGP speakers that ...
Get Internet Routing Architectures, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
