Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.8.3 No BGP4 routing information exists
If BGP4 routing information cannot be found in the routing information obtained by the Switch,
isolate the cause of the problem according to the failure analysis method described in the following
table.
Also, if network partitioning is used and the maximum number of routes is set by the
maximum
routes
configuration command, first, follow the failure analysis method described in 3.8.4 IPv4
routing information cannot be found in VRF.
Table 3-21: Failure analysis method for BGP4
If the status of every neighboring router is Full, go to No. 5.
4 Check whether the OSPF setting in the
configuration is correct.
If the configuration is correct, go to No. 5.
If the configuration is not correct, modify the configuration.
5 Check the route that has learned the OSPF
route.
show ip route all-routes
If the route is
InActive, go to No. 6.
If the route does not exist, check whether the neighboring router is
advertising the OSPF route.
6 Check whether the route is filtered in the
configuration.
Check whether the neighboring router is advertising the OSPF route.
If the configuration is not correct, modify the configuration. For
details about the procedure for checking the filter configuration
information, see 3.25.1 Checking the filters and QoS configuration
information.
No. Items to check and commands Action
1 Check the BGP4 peer status.
show ip bgp neighbors
If the peer status is other than Established, go to No. 2.
If the peer status is
Established, go to No. 3.
2 Check whether the BGP4 setting in the
configuration is correct.
If the configuration is correct, go to No. 3.
If the configuration is not correct, modify the configuration.
3 Check whether the BGP4 route has been
learned.
show ip bgp received-routes
If the route exists but its status is not active, go to No. 4.
If the route does not exist, go to No. 5.
4 Check whether the routing information
that resolves the next hop address of the
BGP4 route exists.
show ip route
If the routing information that resolves the next hop address exists,
go to No. 5.
If the routing information that resolves the next hop address does not
exist, perform the failure analysis for the protocol for learning the
routing information.
5 Check whether the route is filtered in the
configuration.
Check whether the neighboring router is advertising the BGP4 route.
No. Items to check and commands Action