A route must appear in the routing table via an IGP in order for that routes to be able to be voted ‘best” by BGP.
Route reflectors remove the requirement of having a full mesh iBGP network.
BGP confederations remove the requirement of a full mesh iBGP setup as well as the need for BGP synchronization.
It’s simple as pie to enable MD5 auth to a BGP peer.
R102(config-router)#neigh 192.0.2.101 pass MYKEY
Corrections – I invite them.
This is required blogging…and reading for that matter. A good chunk of this is taken from my CCNP posts from last year. Corrections, please.