show (ospf | ospf3) neighbor

Address

Address of the neighbor.

Interface

Interface through which the neighbor is reachable.

State

State of the neighbor:

• Attempt—Valid only for neighbors attached to nonbroadcast networks. It indicates that no recent information has been received from the neighbor, but that a more concerted effort must be made to contact the neighbor.

• Down—Initial state of a neighbor conversation. It indicates that no recent information has been received from the neighbor. Hello packets might continue to be sent to neighbors in the Down state, although at a reduced frequency.

• Exchange—Routing device is describing its entire link-state database by sending database description packets to the neighbor. Each packet has a sequence number and is explicitly acknowledged.

• ExStart—First step in creating an adjacency between the two neighboring routing devices. The goal of this step is to determine which routing device is the primary, and to determine the initial sequence number.

• Full—Neighboring routing devices are fully adjacent. These adjacencies appear in router link and network link advertisements.

• Init—A hello packet has recently been sent by the neighbor. However, bidirectional communication has not yet been established with the neighbor. This state may occur, for example, because the routing device itself did not appear in the neighbor's hello packet.

• Loading—Link-state request packets are sent to the neighbor to acquire more recent advertisements that have been discovered (but not yet received) in the Exchange state.

• 2Way—Communication between the two routing devices is bidirectional. This state has been ensured by the operation of the Hello Protocol. This is the most advanced state short of beginning adjacency establishment. The (backup) designated router is selected from the set of neighbors in state 2Way or greater.

ID

Router ID of the neighbor.

Pri

Priority of the neighbor to become the designated router.

Dead

Number of seconds until the neighbor becomes unreachable.

Link state acknowledgment list

Number of link-state acknowledgments received.

Link state retransmission list

Total number of link-state advertisements retransmitted. For extensive output only, the following information is also displayed:

• Type—Type of link advertisement: ASBR, Sum, Extern, Network, NSSA, OpaqArea, Router, or Summary.

• LSA ID—LSA identifier included in the advertisement. An asterisk preceding the identifier marks database entries that originated from the local routing device.

• Adv rtr—Address of the routing device that sent the advertisement.

• Seq—Link sequence number of the advertisement.

Neighbor-address

(OSPFv3 only) If the neighbor uses virtual links, the Neighbor-address is the site-local, local, or global address. If the neighbor uses a physical interface, the Neighbor-address is an IPv6 link-local address.

area

Area that the neighbor is in.

OSPF3-Intf-Index

(OSPFv3 only) Displays the OSPFv3 interface index.

opt

Option bits received in the hello packets from the neighbor.

DR or DR-ID

Address of the designated router.

BDR or BDR-ID

Address of the backup designated router.

Up

Length of time since the neighbor came up.

adjacent

Length of time since the adjacency with the neighbor was established.

SPRING Adjacency Labels

Segment routing in networking adjacency labels.

Label

Segment routing label.

Flags

Segment routing flags. Flags VL indicate value and local.