Interface Address IP address of the interface.
In the Area Area and interface through which the OSPF neighbor is known.
Neighbor Priority Router priority of the neighbor, neighbor state.
State OSPF state.
State Changes Number of state changes since the neighbor was created. This value can
be reset using the clear ip ospf counters neighbor command.
DR Router ID of the designated router for the interface.
BDR Router ID of the backup designated router for the interface.
continues
152 Chapter 4: Single-Area OSPF Implementation
1 LLs = link-local signaling
2 OOB = out-of-band
3 NSF = nonstop forwarding
Using OSPF debug Commands
The debug ip ospf events output shown in Example 4-6 might appear if any of the following
situations occur:
?– The IP subnet masks for the routers on the same network do not match.
?– The OSPF hello interval for the router does not match the OSPF hello interval that is
con?¬?gured on a neighbor.
?– The OSPF dead interval for the router does not match the OSPF dead interval that is
con?¬?gured on a neighbor.
Field Description
Options Hello packet options ?¬?eld contents. (E-bit only. Possible values are 0 and
2; 2 indicates that the area is not a stub; 0 indicates that the area is a stub.
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