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Chapter 4. Routing | 289
ProSafe® Gigabit L3 Managed Stackable Switches Software Administration Manual
Neighbor Interface
Index
A Unit/Slot/Port identifying the neighbor interface index.
State The state of a neighbor can be the following:
• Down - This is the initial state of a neighbor conversation. It indicates that there
has been no recent information received from the neighbor. On NBMA networks,
Hello packets may still be sent to “Down” neighbors, although at a reduced
frequency.
• Attempt - This state is only valid for neighbors attached to NBMA networks. It
indicates that no recent information has been received from the neighbor, but
that a more concerted effort should be made to contact the neighbor. This is
done by sending the neighbor Hello packets at intervals of Hello Interval.
• Init - In this state, a Hello packet has recently been seen from the neighbor.
However, bidirectional communication has not yet been established with the
neighbor (i.e., the router itself did not appear in the neighbor's Hello packet). All
neighbors in this state (or greater) are listed in the Hello packets sent from the
associated interface.
• 2-Way - In this state, communication between the two routers is bidirectional.
This has been assured 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 2-Way or
greater.
• Exchange Start - This is 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 DD sequence number. Neighbor conversations in
this state or greater are called adjacencies.
• Exchange - In this state the router is describing its entire link state database by
sending Database Description packets to the neighbor. In this state, Link State
Request Packets may also be sent asking for the neighbor's more recent LSAs.
All adjacencies in Exchange state or greater are used by the flooding procedure.
These adjacencies are fully capable of transmitting and receiving all types of
OSPF routing protocol packets.
• Loading - In this state, 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 - In this state, the neighboring routers are fully adjacent. These
adjacencies will now appear in router-LSAs and network-LSAs.
Events The number of times this neighbor relationship has changed state, or an error has
occurred.
Permanence This variable displays the status of the entry. 'dynamic' and 'permanent' refer to
how the neighbor became known.
Hellos Suppressed This indicates whether Hellos are being suppressed to the neighbor.
Retransmission Queue
Length
An integer representing the current length of the retransmission queue of the
specified neighbor router Id of the specified interface.
Up Time Neighbor uptime; how long since the adjacency last reached the Full state.
Dead Time The amount of time, in seconds, to wait before the router assumes the neighbor is
unreachable.
Table 34.
Field Description
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