External BGP for Enterprises
Some of the core operational concepts of BGP mirror those of EIGRP and OSPF. BGP first forms a neighbor relationship with peers. BGP then learns information from its neighbors, placing that information in a table—the BGP table. Finally, BGP analyzes the BGP table to choose the best working route for each prefix in the BGP table, placing those routes into the IP routing table.
This section discusses external BGP (eBGP), focusing on two of the three aspects of how a routing protocol learns routes: forming neighborships and exchanging the reachability or topology information that is stored in the BGP table. First, this section examines the baseline configuration of eBGP peers (also called neighbors), along with several ...
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