Why OSPF neighbor relation of NE40/80 cannot be established normally?
Display and configure NE40/80 with commands
1. The interface does not enable OSPF.
2. The physical layer or link layer is failed.
3. The interface is defined as silient-interface.
4. The device of both sides denies OSPF protocol packet or the intermediate device denies OSPF protocol packet.
5. The subnet mask of IP address of connected port is not consistent.
6. OSPF check type or password is not consistent.
7. Area id of both sides is not consistent.
8. The area type of interconnected port (common, stub and NSSA) is not consistent.
9. The subinterface establishes neighbor relation with slave address.
10. NBMA, Frame Relay and X.25 do not define network type or designate neighbor.
11. There is short of broadcast optional parameters in frame-relay (fr map ip), ATM (map ip) and dialer (dialer route ip).
OSPF neighbor relation of NE40/80 cannot be established. It can check the problem with display ospf error or debug ospf.