Use the following commands for debugging issues with BGP route update processing,
including policy filters:
•
debug bgp updates {in|out}
•
debug bgp filters
For more information about the debug bgp commands for IPv4 and IPv6, see Debug
command options for BGP and BGP+ for IPv6 on page
143.
BGP show options
There are many show commands available for troubleshooting BGP operations. The BGP
show commands provide information that ranges from a quick summary or status of peers to
very
detailed filters for displaying BGP routes, and even how and which routes are affected by
the BGP policies on the system.
Begin with the following commands for troubleshooting issues related to BGP peering
sessions, or to get a quick summary of information on the prefixes and routes received from
specific neighbors:
• show bgp all neighbors show bgp ipv6 neighbors
• show bgp all summary show bgp ipv6 summary
•
show ip protocols bgp
Use the following commands to get information about the BGP routes learned and the route
status: show bgp ipv4 show bgp ipv6
The following figure shows the command syntax to use to get more detailed and complete
information about routes to a specific destination or network (IPv4 network):
Figure 12: show bgp ipv4 command options for specifying destination
The following figure shows the command syntax to use to get more detailed and complete
information about routes to a specific destination or network (IPv6 network):
Figure 13: show bgp ipv6 command options for specifying destination
BGP routes can be subjected to various policy configurations that can change the route
attributes. Also, certain features (for example, dampening) can cause the routes to be
suppressed
in the event of excessive route flaps. It is often useful to selectively see the routes
that are affected or modified as a result of a specific policy, attribute, or dampening when
Troubleshooting unicast routing
132 Troubleshooting August 2013
Comments? infodev@avaya.com
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