3. Troubleshooting Functional Failures in Operation613.7 IPv4 Unicast Routing Communication Failure3.7.1 No RIP Routing Information ExistsIsolate the problem according to the failure analysis method listed below if RIP route information does not exist in thedisplayed 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 RoutingInformation Exist [OP-NPAR]." [OP-NPAR]Table 3-18: RIP Failure Analysis Method3.7.2 No OSPF Routing Information ExistsIsolate the problem according to the failure analysis method listed below if OSPF route information does not exist inthe 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 RoutingInformation Exist [OP-NPAR]." [OP-NPAR]Table 3-19: OSPF Failure Analysis MethodNo. Troubleshooting Steps and Command Action1 RIP neighboring information is displayed.show ip rip neighborGo 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 theconfiguration.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 byreferring 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 Action1 Check the interface status of OSPF.show ip ospf interface 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 DRfrom 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 fromNeighbor 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 inconfiguration.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-routesGo to No. 6 if the route is set to "InActive."If no route exists, check to see if the neighboring router advertises the OSPFroute.6 Confirm that the routing are not filtered byreferring to the configuration.Check to see if the neighboring router advertises the OSPF route.Correct the configuration if it is not correct.
