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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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