show ip ospf neighbor

This command displays information about OSPF neighbors for the specified virtual router. If no router is specified, it displays information for the default router. If you do not specify a neighbor IP address, the output displays summary information in a table. If you specify an interface or tunnel, only the information for that interface or tunnel displays, if the interface is a physical routing interface and vlan format if the interface is a routing vlan. The ip-address is the IP address of the neighbor, and when you specify this, detailed information about the neighbor displays. The information below only displays if OSPF is enabled and the interface has a neighbor.

Format	`show ip ospf neighbor [vrf vrf-name][interface {unit/slot/port\|vlan 1-4093}] [ip-address]`
Mode	User EXEC Privileged EXEC

If you do not specify an IP address, a table with the following columns displays for all neighbors or the neighbor associated with the interface that you specify:

Term	Definition
Router ID	The 4-digit dotted-decimal number of the neighbor router.
Priority	The OSPF priority for the specified interface. The priority of an interface is a priority integer from 0 to 255. A value of '0' indicates that the router is not eligible to become the designated router on this network.
IP Address	The IP address of the neighbor.
Interface	The interface of the local router in `unit/slot/port` format.
State	The state of the neighboring routers. Possible values are: Down-Initial state of the neighbor conversation; no recent information has been received from the neighbor. Attempt-No recent information has been received from the neighbor but a more concerted effort should be made to contact the neighbor. Init-An Hello packet has recently been seen from the neighbor, but bidirectional communication has not yet been established. 2 way-Communication between the two routers is bidirectional. Exchange start-The first step in creating an adjacency between the two neighboring routers, the goal is to decide which router is the master and to decide upon the initial DD sequence number. Exchange-The router is describing its entire link state database by sending Database Description packets to the neighbor. Loading-Link State Request packets are sent to the neighbor asking for the more recent LSAs that have been discovered (but not yet received) in the Exchange state. Full-The neighboring routers are fully adjacent and they will now appear in router-LSAs and network-LSAs.
Dead Time	The amount of time, in seconds, to wait before the router assumes the neighbor is unreachable.

If you specify an IP address for the neighbor router, the following fields display:

Term	Definition
Interface	`unit/slot/port`
Neighbor IP Address	The IP address of the neighbor router.
Interface Index	The interface ID of the neighbor router.
Area ID	The area ID of the OSPF area associated with the interface.
Options	An integervalue that indicates the optional OSPF capabilities supported by the neighbor. The neighbor's optional OSPF capabilities are also listed in its Hello packets. This enables received Hello Packets to be rejected (i.e., neighbor relationships will not even start to form) if there is a mismatch in certain crucial OSPF capabilities.
Router Priority	The OSPF priority for the specified interface. The priority of an interface is a priority integer from 0 to 255. A value of '0' indicates that the router is not eligible to become the designated router on this network.
Dead Timer Due	The amount of time, in seconds, to wait before the router assumes the neighbor is unreachable.
Up Time	Neighbor uptime; how long since the adjacency last reached the Full state.
State	The state of the neighboring routers.
Events	The number of times this neighbor relationship has changed state, or an error has occurred.
Retransmitted LSAs	The number of LSAs retransmitted to this neighbor.
Retransmission Queue Length	An integer representing the current length of the retransmission queue of the specified neighbor router Id of the specified interface.
Restart Helper Status	Indicates the status of this router as a helper during a graceful restart of the router specified in the command line: Helping – This router is acting as a helpful neighbor to this neighbor. A helpful neighbor does not report an adjacency change during graceful restart, but continues to advertise the restarting router as a FULL adjacency. A helpful neighbor continues to forward data packets to the restarting router, trusting that the restarting router's forwarding table is maintained during the restart. Not Helping – This router is not a helpful neighbor at this time.
Restart Reason	When this router is in helpful neighbor mode, this indicates the reason for the restart as provided by the restarting router: Unknown (0) Software restart (1) Software reload/upgrade (2) Switch to redundant control processor (3) Unrecognized – a value not defined in RFC 3623 When LCOS SX sends a grace LSA, it sets the Restart Reason to Software Restart on a planned warm restart when the `initiate failover` command is invoked), and to Unknown on an unplanned warm restart.
Remaining Grace Time	The number of seconds remaining the in current graceful restart interval. This is displayed only when this router is currently acting as a helpful neighbor for the router specified in the command.
Restart Helper Exit Reason	Indicates the reason that the specified router last exited a graceful restart. None – Graceful restart has not been attempted In Progress – Restart is in progress Completed – The previous graceful restart completed successfully Timed Out – The previous graceful restart timed out Topology Changed – The previous graceful restart terminated prematurely because of a topology change

Example: The following shows example CLI display output for the command.

(alpha1) #show ip ospf neighbor 170.1.1.50

Interface.....................................0/17
Neighbor IP Address...........................170.1.1.50
Interface Index...............................17
Area Id.......................................0.0.0.2
Options.......................................0x2
Router Priority...............................1
Dead timer due in (secs)......................15
Up Time.......................................0 days 2 hrs 8 mins 46 secs
State.........................................Full/BACKUP-DR
Events........................................4
Retransmitted LSAs............................32
Retransmission Queue Length...................0
Restart Helper Status........................ Helping
Restart Reason............................... Software Restart (1)
Remaining Grace Time......................... 10 sec
Restart Helper Exit Reason................... In Progress