Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
382
of
473
Troubleshooting OSPF6
Before performing the troubleshooting steps, please note the following:
•
OSPFv3 has the same functionality as OSPFv2, but OSPFv3 uses IPv6 addresses to communicate with
OSPFv3 peers.
•
OSPFv3 uses the same SPF algorithm as OSPFv2.
•
OSPFv3 has a different process than OSPFv2.
•
OSPFv3 maintains separate neighbor tables, topology tables and routing tables from OSPFv2.
OSPF6 Troubleshooting Steps:
1.
Verify there is no mismatch in the hello parameters or in the dead timer.
2.
Verify that the link is up. Ping the other end of the link.
3.
Make sure that the interfaces at both ends are configured to support OSPF.
4.
Check for a mismatch in the OSPF Network Type.
5.
Verify that Hello and Dead timers match on each end of the link
6.
Verify that Neighboring interfaces are in the same OSPF Area.
7.
If the device is in more than one area, then it MUST have at least one interface in Area 0.
8.
OSPF Area IDs: When using multiple network area statements in the OSPF configuration, the order of the
statements is critical. Check that the networks have been assigned the desired area IDs by checking the
output of the
show ip ospf
interface command.
9.
OSPF Does Not Start: The OSPF process cannot start on a router if a router ID cannot be established. Check
the output of
show ip ospf
to see if a router ID has been established. If a router ID has not been
established, check to see if the router has an active interface (preferably a loopback interface) with an IP
address.
10.
Verify Neighbor relationships: Once a router is able to start OSPF, it establishes an interface data structure
for each interface configured to run OSPF. Check the output of
show ip ospf interface
to ensure that
OSPF is active on the intended interfaces. If OSPF is active, check for an incorrectly configured interface.
11.
Check if there is an entry in the OSPF Database for a particular external route, but it is not showing in the
routing table. Check the Forwarding Address associated with the route.
