R3303-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

124
Destination: 120.1.1.0/24
Protocol: OSPF Process ID: 0
Preference: 0 Cost: 2
IpPrecedence: QosLcId:
NextHop: 192.168.0.100 Interface: GigabitEthernet2/1/1
BkNextHop: 0.0.0.0 BkInterface:
RelyNextHop: 0.0.0.0 Neighbor : 0.0.0.0
Tunnel ID: 0x0 Label: NULL
BKTunnel ID: 0x0 BKLabel: NULL
State: Invalid Adv Age: 00h58m05s
Tag: 0
Troubleshooting OSPF configuration
No OSPF neighbor relationship established
Symptom
No OSPF neighbor relationship can be established.
Analysis
If the physical link and lower layer protocols work well, check OSPF parameters configured on interfaces.
Two neighbors must have the same parameters, such as the area ID, network segment, and mask (a P2P
or virtual link might have different network segments and masks).
Solution
1. Verify OSPF neighbor information with the display ospf peer command.
2. Verify OSPF interface information with the display ospf interface command.
3. Ping the neighbor router's IP address to check connectivity.
4. Examine OSPF timers. The dead interval on an interface must be at least four times the hello
interval.
5. On an NBMA network, use the peer ip-address command to manually specify the neighbor.
6. At least one interface must have a router priority higher than 0 on an NBMA or a broadcast
network.
Incorrect routing information
Symptom
OSPF 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 belong to the stub area.