Border Gateway Protocol (BGP) Overview Autonomous system numbers BGP sessions Inter-router communication BGP messages BGP neighbor states Injecting routes/prefixes into the BGP table Path attributes BGP best-path calculation Loop prevention Route policies Resetting BGP sessions IBGP full mesh requirement Route reflectors Loop prevention in route reflectors BGP peer groups BGP communities Aggregate routes BGP Graceful-Restart and high availability Basic BGP configuration Address families Scale limits BGP commands