Troubleshooting BGP Route Not Installing in Routing Table

This section discusses issues related to BGP routes not getting installed in the IP routing table. If a router must forward an IP packet by looking at the IP destination address in IP packet, the router must have an IP routing table entry for the subnet of the IP destination address.

If the BGP process fails to create an IP routing table entry, all traffic destined for missing IP subnets in the routing table will be dropped. This is a generic behavior of hop-by-hop IP packet forwarding done by routers.

Problems in this section assume that the BGP table has all the updates for IP prefixes but that BGP is not installing them in IP routing table.

Following is the list of all problems discussed in this section:

• An IBGP-learned route is not getting installed in the IP routing table.

• An EBGP-learned route is not getting installed in the IP routing table.