BGP neighbors are routers forming TCP connection for exchanging BGP updates. They are also called BGP Peers or BGP Speakers.

There are two types of BGP relationship:

• IBGP (Internal BGP)
• EBGP (External BGP)

BGP Databases

Neighbor table

• a list of all configured BGP neighbors
• neighbor has to be manually configured using neighbor command
• we have lots of variations regarding neihborship like internal bgp neighbors, external neighbors, neighborship using loopbacks, route reflectors, peer groups, etc…
• #sh ip bgp summary
• #sh ip bgp neighbors

BGP forwarding table/database

• A list of networks known by BGP, along with their paths and attributes
• #sh ip bgp

IP routing table

• List of best paths to destination networks
• sh ip route