BGP problem with ISP

[elderr]

Problem: MPLS connection between our 2 HQ sites is randomly losing BGP neighbor. The neighbor router ID is the same for both sites but the interface IP is different. Our ISP is not being helpful on resolving the problem. I need help to prove this is a ISP problem. Is there a good BGP debug to use that would help detech an error? Below is an output of our log when the error takes place. Any other ideas on why we lose our neighbor connection?

%BGP-5-ADJCHANGE: neighbor 68.139.0.33 Down Peer closed the session

%BGP-5-ADJCHANGE: neighbor 68.139.0.33 Up

[AJAZ NAWAZ · Accepted solution]

two of the better debug commands for bgp are:

debug ip bgp events

debug ip bgp updates

hth,

Ajaz

[sdoremus33 · Accepted solution]

Also are there any timing issues between you and thne ISP,check bgp timers also as mentioned before

debug ip bgp events

[Giuseppe Larosa · Accepted solution]

Hello,

are you using a QoS scheduler to protect BGP traffic ?

if your link is very busy there is a chance that BGP keepalives can be sometimes lost causing this type of problem.

Use the debug commands suggested in the other posts to verify what happens.

hope to help

Giuseppe