The Routing Process Simplified
Until now, this chapter has examined discrete aspects of routing—specifically, peer negotiation and static versus dynamic routing. Before diving into details of routing configuration, it makes sense to pause here and briefly overview the BGP routing process in its entirety.
BGP is a fairly simple protocol, which is why it's so flexible. Routes are exchanged between BGP peers via UPDATE messages. BGP routers receive the UPDATE messages, run some policies or filters over the updates, and then pass the routes to other BGP peers. An implementation is required to keep all BGP updates in a BGP routing table separate from the IP routing table. In case multiple routes to the same destination exist, BGP does not flood ...
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