The BGP Update Message
When a BGP neighborship reaches the Established state, those neighbors begin sending BGP Update messages to each other. The router receiving an Update places those learned prefixes into its BGP table, regardless of whether the route appears to be the best route. Like EIGRP and OSPF, BGP puts all learned routing information into its table, and then BGP processes all such potential routes to choose the best route for each prefix.
The BGP Update message itself can be revealing about the motivations behind BGP. Figure 13-19 shows the format of the Update message.
Figure 13-19 Format of the BGP Update Message
Interestingly, ...
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