CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Examining the BGP Table

One of the key tasks in a BGP verification plan should be to examine the prefixes in the BGP table and confirm that the right prefixes have been learned from the expected neighbors. The BGP table should hold all learned prefixes, from each neighbor, except for any prefixes filtered by an inbound BGP filter. For example, in a router configured with a neighbor route-map in command, the local router would first filter the routes and then add the allowed routes into the BGP table.

As an example, consider Figure 13-20, which shows the same basic topology as Figure 13-16 but with only the information pertinent to the upcoming discussions listed in the figure. In this case, five prefixes exist somewhere in the Internet, with ...