BGP Troubleshooting
Troubleshooting BGP involves checking neighbor adjacencies, advertised routes, and policy application. Here are some common issues and commands.
Common Issues:
- Neighbor Adjacency Issues: Incorrect neighbor IP, AS number mismatch, ACL blocking, or authentication issues.
- Route Not Advertised: Network command missing, synchronization issues, or policy filtering.
- Path Selection Issues: Incorrect path attributes or policy application.
Useful Commands:
show ip bgp summary: Verifies BGP neighbor status.show ip bgp: Displays entries in the BGP routing table.show ip bgp neighbors [address] advertised-routes: Shows routes advertised to a specific neighbor.show ip bgp neighbors [address] received-routes: Shows routes received from a specific neighbor.clear ip bgp *: Resets all BGP sessions (use with caution).