User Manual

OSPF and OSPFv3
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M4200 and M4300 Series ProSAFE Managed Switches Web Management User Manual
Options An integer value 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 (for example,
neighbor relationships do 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.
State The state of a neighbor can be the following:
• Down. This is the initial state of a neighbor conversation. It indicates that no
recent information was received from the neighbor. On NBMA networks,
hello packets can still be sent to Down neighbors, although at a reduced
frequency.
• Attempt. This state is valid only for neighbors attached to NBMA networks.
It indicates that no recent information was received from the neighbor, but
that a more concerted effort must be made to contact the neighbor. This is
done by sending the neighbor hello packets at hello intervals.
• Init. A hello packet was recently seen from the neighbor. However,
bidirectional communication was not yet established with the neighbor (for
example, the router 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. Communication between the two routers is bidirectional. This was
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. The router is describing its entire link state database by sending
database description packets to the neighbor. The link state request packets
can also be sent asking for the neighbor's more recent LSAs. All
adjacencies in the 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. Link state request packets are sent to the neighbor asking for the
more recent LSAs that were discovered (but not yet received) in the
exchange state.
• Full. The neighboring routers are fully adjacent. These adjacencies now
appear in router LSAs and network LSAs.
Events The number of times this neighbor relationship changed state, or an error
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.
Table 133. OSPF Neighbor Table (continued)
Field Description