BGP Troubleshooting

So you see an alert in Solarwinds that looks something like this:

Node cr1.andromedaindustries.com's BGP Peer 0.0.0.0 - Code: 1

What does it mean? You'll have to log in to the node listed to determine what went wrong. Looking for a BGP peer of 0.0.0.0 is kind of a difficult prospect, as no such IP address exists, anywhere!

Once you're logged in, run the commands below that are associated with the device you are connected to. What you're looking for is something that relates to the status code attached to the Solarwinds alert.

• Code 0: Disabled
• Code 1: Idle
• Code 2: Connecting
• Code 3: Active
• Code 4: Constraints Violation
• Code 5: In Service, Timed Out
• Code 6: Established.

Display BGP Status

Cisco

• show ip bgp all summary will give you a list of all BGP sessions for each address family (IPv4, IPv6, VPNv4, etc.)
• show ip bgp all neighbor X.X.X.X where X.X.X.X is the IP address of a neighbor shown in the summary will give you information on that particular neighbor, including a description that should be associated with an interface on the device you are logged in to.

Adtran

Samsung

• sh bgp ipv4 unicast neighbors

Administratively shutdown/raise neighbor state

CAUTION: Changing the BGP state will effect service. Ensure that intrusive testing is authorized and the connection is not in use.

Cisco

• Find router BGP key in running config, I.E.: <code>router bgp 36471</code>

Router#conf t

Router(config)#router bgp 12345

Router(config)#neighbor 192.168.1.10 shut

• When the circuit is stable again, restore use of the T1:

Router#conf t

Router(config)#router bgp 12345

Router(config)#no neighbor 192.168.1.10 shut