4-28[SwitchB-ospf-1-area-0.0.0.1] network 197.1.1.0 0.0.0.255[SwitchB-ospf-1-area-0.0.0.1] vlink-peer 3.3.3.3# Configure Switch C. system-view[SwitchC] interface Vlan-interface 1[SwitchC-Vlan-interface1] ip address 152.1.1.1 255.255.255.0[SwitchC-Vlan-interface1] quit[SwitchC] interface Vlan-interface 2[SwitchC-Vlan-interface2] ip address 197.1.1.1 255.255.255.0[SwitchC-Vlan-interface2] quit[SwitchC] router id 3.3.3.3[SwitchC] ospf[SwitchC-ospf-1] area 1[SwitchC-ospf-1-area-0.0.0.1] network 197.1.1.0 0.0.0.255[SwitchC-ospf-1-area-0.0.0.1] vlink-peer 2.2.2.2[SwitchC-ospf-1-area-0.0.0.1] quit[SwitchC-ospf-1] area 2[SwitchC-ospf-1-area-0.0.0.2] network 152.1.1.0 0.0.0.255Troubleshooting OSPF ConfigurationUnable to Establish a Neighbor Relationship between RoutersSymptomNo neighbor relationship can be established between neighboring routers.Analysis1) Verify that the routers work normally at the link layer.2) Verify that the conditions for establishing a neighbor relationship are satisfied.z OSPF parameters on the interconnected interfaces must be consistent.z Area IDs on the interconnected interfaces must be the same.z Network ID and subnet masks of the interconnected interfaces must be consistent. (P2P networksand virtual link are excluded.)z The interconnected interfaces have the same type of network.z If the network type of the interface on the local router is NBMA, a neighbor must be specified byusing the peer command.SolutionPerform the following procedure.1) Use the display ip interface brief command to verify that the link layer works normally.2) Use the ping command to check network layer connectivity.3) Use the display ospf interface command to view the OSPF interface configuration.4) If the network type of an interface is NBMA, use the display current-configuration configurationospf command to verify that a neighbor is specified for the router.5) Use the display ospf brief command to check that the OSPF timers are consistent with those onthe neighbor and that the dead time of the neighbor is four times the Hello interval.6) Use the display ospf peer command to view neighbors.
