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3. Troubleshooting Functional Failures in Operation
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3.7 IPv4 Unicast Routing Communication Failure
3.7.1 No RIP Routing Information Exists
Isolate the problem according to the failure analysis method listed below if RIP route information does not exist in the
displayed route information acquired by this system.
Besides, when the upper limit of routing is set by configuration command maximum routes, see "3.7.4 No Routing
Information Exist [OP-NPAR]." [OP-NPAR]
Table 3-18: RIP Failure Analysis Method
3.7.2 No OSPF Routing Information Exists
Isolate the problem according to the failure analysis method listed below if OSPF route information does not exist in
the displayed route information acquired by this system.
Besides, when the upper limit of routing is set by configuration command maximum routes, see "3.7.4 No Routing
Information Exist [OP-NPAR]." [OP-NPAR]
Table 3-19: OSPF Failure Analysis Method
No. Troubleshooting Steps and Command Action
1 RIP neighboring information is displayed.
show ip rip neighbor
Go to No. 2 if the interface of a neighboring router is not displayed.
Go to No. 3 if the interface of a neighboring router is displayed.
2 Check to see if the RIP setting is correct in the
configuration.
Go to No. 3 if the configuration is correct.
Correct the configuration if it is not correct.
3 Confirm that the routing are not filtered by
referring to the configuration.
Check to see if the neighboring router advertises the RIP route.
Correct the configuration if it is not correct.
No. Troubleshooting Steps and Command Action
1 Check the interface status of OSPF.
show ip ospf interface <IP Address>
Go to No. 3 if the interface status is DR.
Go to No. 2 if the interface status is BackupDR or DR Other.
Execute the command again after a certain period if the interface status is
"Waiting." Go to No. 1.
2 Check the status of a neighboring router of DR
from Neighbor List.
Go to No. 4 if the status of the neighboring router of DR is other than Full.
Go to No. 5 if the status of the neighboring router of DR is Full.
3 Check the status of all neighboring routers from
Neighbor List.
Go to No. 4 if the status of some neighboring routers is other than Full.
Go to No. 5 if the status of all neighboring routers is Full.
4 Check to see if the OSPF setting is correct in
configuration.
Go to No. 5 if the configuration is correct.
Correct the configuration if it is not correct.
5 Check the OSPF routes that have been learned.
show ip route all-routes
Go to No. 6 if the route is set to "InActive."
If no route exists, check to see if the neighboring router advertises the OSPF
route.
6 Confirm that the routing are not filtered by
referring to the configuration.
Check to see if the neighboring router advertises the OSPF route.
Correct the configuration if it is not correct.