Troubleshooting guide

Troubleshooting BGP
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Introduction
This chapter provides troubleshooting solutions to some common Border Gateway
Protocol (BGP) routing protocol problems:
• Handling BGP Routing Problems
• Handling BGP Peer Misconfigurations
Handling BGP Routing Problems
Follow these sections to correct BGP routes missing from the routing table so that the
BGP router and network are advertised to other routers.
Missing Neighbor Table Entry
Follow these steps to add entries to the BGP neighbor routing table:
1. Check local and remote routers and ensure the specified autonomous system
numbers and neighbors are correct.
2. Configure any autonomous system numbers and neighbors that are misconfigured
or missing. For example, to specify that a router at the address 10.10.1.2 is a
neighbor in autonomous system number 100, use the following series of
commands, as shown below.
RDN(config)#router bgp
RDN(config-bgp)#network 10.10.0.0
RDN(config-bgp)#neighbor 10.10.1.2 remote-as 100
3. To ensure any enabled route filters are not misconfigured, use the show
running-config command in Privileged EXEC mode.