Troubleshooting Ospf Configuration; No Ospf Neighbor Relationship Established - 3Com S7906E Configuration Manual

*0.50673831
session[10.1.0.102/10.1.0.100, vlan10]
*0.50673831 SwitchA BFD/8/SCM:Sess[10.1.0.102/10.1.0.100, vlan10], Oper: Delete
*0.50673832 SwitchA BFD/8/SCM:Delete send-packet timer
*0.50673833 SwitchA BFD/8/SCM:Delete session entry
*0.50673833 SwitchA BFD/8/SCM:Delete session from IP hash table
*0.50673834 SwitchA BFD/8/SCM:Delete session from bfd interface
*0.50673834 SwitchA BFD/8/SCM:No session under bfd-int[vlan10] with default configuration,
delete bfd-if
*0.50673835 SwitchA BFD/8/SCM:Bfd-if[vlan10], Oper: Delete
*0.50673840 SwitchA BFD/8/SCM:No bfd session exists, stop receiving any bfd packets
# Display the BFD information of Switch A. You can see that Switch A has removed its neighbor
relationship with Switch B and therefore no information is output.
<SwitchA> display bfd session
# Display the OSPF neighbor information of Switch A. You can see that Switch A has removed its
neighbor relationship with Switch B and therefore no information is output.
<SwitchA> display ospf peer

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 may have different network segments and masks).
Solution
1) Display OSPF neighbor information using the display ospf peer command.
2) Display OSPF interface information using the display ospf 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 an NBMA network, using the peer ip-address command to specify the neighbor manually is
required.
6) On an NBMA or a broadcast network, at least one connected interface must have a DR priority
higher than 0.
SwitchA BFD/8/SCM:No
OSPF Process 1 with Router ID 192.168.1.40
Neighbor Brief Information
application
1-75
in session, delete