BGP debugging - session establishment and capability exchange

[fendemann]

I try to trace the capability negotiation between two ebgp speaker.

What are the related debug commands to get the exchanged information from the bgp open messages with minimum overhead on a router running IOS XR 6.1.3.

[shaps]

These debugs can be run without to much issue to the cpu,

debug bgp io
debug bgp events

[fendemann]

Thanks.

On my system v9k v6.1.3 both debug commands work, but there is no information about the bgp capability negotiation in the bgp open phase in the syslog.

When I try debug bgp all I can see the bgp capabilities offered from the neighbor, but there is no information logged, which capabilities are offered from the xr router itself.

I´ve ask the cisco support and keep you informed.

[fendemann]

Answer from cisco support is, that there are no debug commands available to trace the offered bgp capabilities from the cisco router. You can only trace the capabilities received from the bgp neighbor.