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This section discusses the following topics:
Open Messages
After a TCP connection is established between two BGP systems, they exchange BGP open messages to create a BGP connection between them. Once the connection is established, the two systems can exchange BGP messages and data traffic.
Update Messages
Once two routers have become BGP neighbors, they can start exchanging routing information.
BGP systems send update messages to exchange network reachability information. BGP systems use this information to construct a graph that describes the relationships among all known ASs.
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