BGP debug Commands

Section 16-1. debug ip bgp

Section 16-2. debug ip bgp neighbor-ip-address updates

Section 16-3. debug ip bgp neighbor-ip-address updates access-list-number

Section 16-4. debug ip bgp dampening

Section 16-5. debug ip bgp dampening access-list-number

Section 16-6. debug ip bgp events

Section 16-7. debug ip bgp keepalives

Section 16-8. debug ip bgp in neighbor-ip-address updates

Section 16-9. debug ip bgp in neighbor-ip-address updates access-list-number

Section 16-10. debug ip bgp out neighbor-ip-address updates

Section 16-11. debug ip bgp out neighbor-ip-address updates access-list-number

Section 16-12. debug ip bgp updates

Section 16-13. debug ip bgp updates in

Section 16-14. debug ip bgp updates out

Section 16-15. debug ip bgp updates access-list-number

• Section 16-16. debug ip bgp updates access-list-number in

Syntax Description: This command has no arguments.

Purpose: Use to debug the formation of the BGP neighbor relationship.

Cisco IOS Software Release: 10.0 Configuration Example

In Figure 16-1, Router B has been configured with the wrong AS number for Router A.

Figure 16-1. Use debug ip bgp to Determine Configuration Errors

Figure 16-1. Use debug ip bgp to Determine Configuration Errors

Router A router bgp 1

neighbor 172.17.1.1 remote-as 2

Router B router bgp 2 neighbor 172.17.1.2 remote-as 1

Use debug ip bgp to identify the problem with the formation of the neighbor relationship between Routers A and B:

rtrB# debug ip bgp

16-3 debug ip bgp neighbor-ip-address updates access-list-number

Syntax Description:

neighbor-ip-address— BGP neighbor's IP address.

access-list-number— IP access list number.

Purpose: To debug BGP updates from a particular neighbor. The first form debugs all updates from the neighbor. The second form can be used to debug specific updates from the neighbor. The IP access list number can be in the range 1 to 199 or 1300 to 2699.

Cisco IOS Software Release: 10.0

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