Mypower
S4100
Troubleshooting
Maipu Confidential & Proprietary Information
Page
91
of
124
matched
Check whether the authentication parameters of the two OSPF
negotiation parties are the same. One party should be
configured with authentication and the other party is not
configured with the authentication. One party is configured with
plain text authentication and the other party is configured with
MD5 authentication. The keys of the two parties are different.
Solution: in the interface configuration mode, use the following
commands to change the configurations at two ends:
ip ospf authentication-key
ip ospf authentication message-digest
3.
The OSPF network
modes of the two
interfaces are not
matched
How to find out the cause:
Use the show ip ospf neighbor command and no neighbors are
found for a long time.
The unmatched OSPF network mode may cause that the
neighbors cannot be found, for example, the OSPF network
mode of is NBMA and the other side is point to point. In this
case, the two parties cannot find neighbors. If the network
modes are different, the hello time interval, and neighbor dead
time may be different, and the interface may do not receive the
OSPF multicast packets.
Solution:
Check whether the four types of OSPF network modes are
matched:
ip ospf network broadcast
ip ospf network non-broadcast
ip ospf network point-to-multipoint
ip ospf network point-to-point
Note: The Ethernet is in the broadcast mode by default.
4.
The hello time
parameters of the
OSPF interface of the
two parties are not
matched
How to find out the cause:
Use the show ip ospf neighbor command and no neighbors are
found for a long time.
Open the debug ip ospf packet hello to print the following error
information: OSPF RECV Area 0.0.0.0 172.160.3.4 ->
224.0.0.5: HELLO: HelloInterval mismatch;
Use the show ip ospf interface command to check whether the
hello intervals are the same: Hello: 30 Poll: 0 Dead: 2:00
Retrans: 5. By default:
Point to point network mode: hello interval is 10 seconds;
Point to multiple-point network mode: hello interval is 30
seconds;
Broadcast network mode: hello interval is 10 seconds;
NBMA network mode: hello interval is 30 seconds;
Solution: Ensure that the network modes of the two negotiation
parties are the same. If the hello intervals are different, in the
interface configuration mode, use the following command to
change the hello interval at the two ends into the same values:
ip ospf hello-interval
5.
The dead time
parameters of the
OSPF interface of the
two parties are not
matched
How to find out the cause:
Use the show ip ospf neighbor command and no neighbors are
found for a long time.
Open the debug ip ospf packet hello to print the following error
information: OSPF RECV Area 0.0.0.0 172.160.3.4 ->
224.0.0.5: HELLO: RouterDeadInterval mismatch;
Use the show ip ospf interface command to check whether the
dead time intervals are the same: Hello: 30 Poll: 0 Dead: 2:00
Retrans: 5. By default:
Point to point network mode: hello interval is 40 seconds;
Point to multiple-point network mode: hello interval is 120
seconds;
Broadcast network mode: hello interval is 40 seconds;
NBMA network mode: hello interval is 120 seconds;
