August 2000
Intermediate to advanced
528 pages
12h 44m
English
Content preview from Internet Routing Architectures, Second Edition
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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 ...
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