Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.8 IPv4 unicast routing communication failures
3.8.1 No RIP routing information exists
If RIP 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 3-19: Failure analysis method for RIP
3.8.2 No OSPF routing information exists
If OSPF 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 3-20: Failure analysis method for OSPF
No. Items to check and commands Action
1 Display the RIP neighboring information.
show ip rip neighbor
If the interface of the neighboring router is not displayed, go to No.
2.
If the interface of the neighboring router is displayed, go to No. 3.
2 Check whether the RIP 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 route is filtered in the
configuration.
Check whether the neighboring router is advertising the RIP 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 Display the OSPF interface status.
show ip ospf interface <IP
Address>
If the interface status is
DR or P to P, go to No. 3.
If the interface status is BackupDR or DR Other, go to No. 2.
If the interface status is
Waiting, wait for a while and execute the
command again. Go to No. 1.
2 Check the neighboring router status with
DR in
Neighbor List.
If the neighboring router status with DR is other than
Full, go to
No. 4.
If the neighboring router status with DR is
Full, go to No. 5.
3 Check the status of every neighboring
router in
Neighbor List.
If the status of any neighboring router is other than
Full, go to No.
4.