Internal BGP Between Internet-Connected Routers
When an enterprise uses more than one router to connect to the Internet, and those routers use BGP to exchange routing information with their ISPs, those same routers need to exchange BGP routes with each other as well. The BGP neighbor relationships occur inside that enterprise—inside a single AS—making these routers iBGP peers.
This first major section of this chapter begins with a look at why two Internet-connected routers need to have an iBGP neighbor relationship. Then, the text looks at various iBGP configuration and verification commands. Finally, the discussion turns to a common issue that occurs with next-hop reachability between iBGP peers, with an examination of the options to overcome ...
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