Troubleshooting Ospf Configuration; Unable To Establish A Neighbor Relationship Between Routers; Unable To Learn A Complete Network Topology - H3C S5600 Series Operation Manual

Operation Manual – Routing Protocol
H3C S5600 Series Ethernet Switches
[SwitchC-ospf-1-area-0.0.0.2] network 152.1.1.0 0.0.0.255

4.10 Troubleshooting OSPF Configuration

4.10.1 Unable to Establish a Neighbor Relationship between Routers

I. Symptom
No neighbor relationship can be established between neighboring routers.
II. Analysis
1) Verify that the routers work normally at the link layer.
2) Verify that the conditions for establishing a neighbor relationship are satisfied.
OSPF parameters on the interconnected interfaces must be consistent.
Area IDs on the interconnected interfaces must be the same.
Network ID and subnet masks of the interconnected interfaces must be
consistent. (P2P networks and virtual link are excluded.)
The interconnected interfaces have the same type of network.
If the network type of the interface on the local router is NBMA, a neighbor must
be specified by using the peer command.
III. Solution
Perform 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
current-configuration configuration ospf 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 on the 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.

4.10.2 Unable to Learn a Complete Network Topology

I. Symptom
The router running OSPF is unable to learn a complete network topology.
II. Analysis
Perform the following procedure to make analyses:
network type of an
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Chapter 4 OSPF Configuration
interface is NBMA, use the display