IP Routing Features

Configuring OSPF

 

This display shows the following information.

 

Table 16-9. CLI Display of OSPF Neighbor Information

 

 

 

Field

 

Description

 

 

 

Router ID

 

The router ID of the neighbor.

 

 

 

Pri

 

The OSPF priority of the neighbor. The priority is used during election of the

 

 

Designated Router (DR) and Backup designated Router (BDR).

 

 

 

IP Address

 

The IP address of this routing switch’s interface with the neighbor.

 

 

 

NbIfState

 

The neighbor interface state. The possible values are:

 

 

• DR – this neighbor is the elected designated router for the interface.

 

 

• BDR – this neighbor is the elected backup designated router for the interface.

 

 

• blank – this neighbor is neither the DR or the BDR for the interface.

 

 

 

State

 

The state of the conversation (the adjacency) between your routing switch and the

 

 

neighbor. The possible values are:

 

 

• INIT – A Hello packet has recently been seen from the neighbor. However,

 

 

bidirectional communication has not yet been established with the neighbor. (The

 

 

Series 5300XL Switch itself did not appear in the neighbor's Hello packet.) All

 

 

neighbors in this state (or higher) are listed in the Hello packets sent from the

 

 

associated interface.

 

 

• 2WAY – Communication between the two routers is bidirectional. This is the most

 

 

advanced state before beginning adjacency establishment. The Designated

 

 

Router and Backup Designated Router are selected from the set of neighbors in

 

 

the 2Way state or greater.

 

 

• EXSTART – The first step in creating an adjacency between the two neighboring

 

 

routers. The goal of this step is to decide which router is the master, and to decide

 

 

upon the initial Database Description (DD) sequence number. Neighbor

 

 

conversations in this state or greater are called adjacencies.

 

 

• EXCHANGE – The Series 5300XL Switch is describing its entire link state database

 

 

by sending Database Description packets to the neighbor. Each Database

 

 

Description packet has a DD sequence number, and is explicitly acknowledged.

 

 

Only one Database Description packet can be outstanding at any time. In this

 

 

state, Link State Request packets can also be sent asking for the neighbor's more

 

 

recent advertisements. All adjacencies in Exchange state or greater are used by

 

 

the flooding procedure. In fact, these adjacencies are fully capable of transmitting

 

 

and receiving all types of OSPF routing protocol packets.

 

 

• LOADING – Link State Request packets are sent to the neighbor asking for the

 

 

more recent advertisements that have been discovered (but not yet received) in

 

 

the Exchange state.

 

 

• FULL – The neighboring routers are fully adjacent. These adjacencies will now

 

 

appear in router links and network link advertisements.

 

 

 

Rxmt QLen

 

Remote transmit queue length – the number of LSAs that the routing switch has sent

 

 

to this neighbor and for which the routing switch is awaiting acknowledgements.

 

 

 

Events

 

The number of times the neighbor’s state has changed.

 

 

 

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