3Com MSR 50 Series, Configuration Manual

Page: 1066 / 2443

1066 C
HAPTER
64: IP
V
6 OSPF
V
3 C
ONFIGURATION
1.1.1.1 100 Full/DR 00:00:34 Eth1/0 0
2.2.2.2 0 2-Way/DROther 00:00:34 Eth1/0 0
3.3.3.3 2 Full/Backup 00:00:32 Eth1/0 0
Troubleshooting
OSPFv3 Configuration
No OSPFv3 Neighbor
Relationship Established
Symptom
No OSPF neighbor relationship can be established.
Analysis
If the physical link and lower protocol work well, check OSPF parameters
configured on interfaces. The two neighboring interfaces must have the same
parameters, such as the area ID, network segment and mask, network type. If the
network type is broadcast, at least one interface must have a DR priority higher
than 0.
Process steps
1
Display neighbor information using the display ospfv3 peer command.
2
Display OSPFv3 interface information using the display ospfv3 interface
command.
3
Ping the neighbor router’s IP address to check connectivity.
4
Check OSPF timers. The dead interval on an interface must be at least four times
the hello interval.
5
On a broadcast network, at least one interface must have a DR priority higher than
0.
Incorrect Routing
Information
Symptom
OSPFv3 cannot find routes to other areas.
Analysis
The backbone area must maintain connectivity to all other areas. If a router
connects to more than one area, at least one area must be connected to the
backbone. The backbone cannot be configured as a Stub area.
In a Stub area, all routers cannot receive external routes, and all interfaces
connected to the Stub area must be associated with the Stub area.
Process steps
1
Use the display ospfv3 peer command to display OSPFv3 neighbors.
2
Use the display ospfv3 interface command to display OSPFv3 interface
information.
3
Use the display ospfv3 lsdb command to display Link State Database
information to check integrity.
4
Display information about area configuration using the display
current-configuration configuration command. If more than two areas are
configured, at least one area is connected to the backbone.