NE80E connects C corporation and establishes OSPF neighbor relation. Devices of two ports cannot learn the route distributed by the peer.
1. The neighbor relation is not normally built. (Check enighbor state and it is full.).
2. LSDB has no LSA of corresponding network (Check LSDB and there is no LSA distributed by the peer.).
3. The route is not optimal (Check routing table of two devices and there is no accurate route matching distributed network of the peer and no route with more preference).
The situations above can be ironed out, check the setting of the interface. The network type of the interface is PTP. Check opposite setting and it is broadcast.
Change them as the same and routing information is normally computed and displayed.
OSPF protocol computes optimal path according to LSDB created by LSA. For network segment between two devices, when LSA is created, opposite device records this network segment as broadcast network. Our device records it as PTP network. Although LSA is learnt, devices of two ports describes the network type in the middle differently, route computation is problematic. The route that passes this link cannot compute the route of the peer.