BGP process

Ref: http://hackingcisco.blogspot.com/2011/05/lab-142-bgp-timers.html


http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00809d16f0.shtml#understandbgp

• BGP Open - responsible for BGP session establishment.
• BGP I/O - handles queuing and processing updates and keepalive packets.
• BGP Scanner - responsible for conditional route advertisements, route dampening, import and export of routes into VRF (MPLS), and confirms the reachability to the NEXT_HOP (the last one is handled now by BGP next-hop tracking).
• BGP Router - calculates the best path, establishes peers, sends and receives routes and interacts with RIB.