Lucent Technologies Cajun P220, Руководство по эксплуатации

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Configuring the OSPF Routing Protocol (Layer 3)
Cajun P550/P220 Switch Operation Guide 9 - 11
2. Use Table 9-8 to review the OSPF neighbors parameters:
Table 9-8. OSPF Neighbors Parameters
Parameter Definition
IP Address The IP address associated with the OSPF neighbor.
State The functional level of an interface. States include:
• Down - This is the initial state of a neighbor conversation. It
indicates that there has been no recent information received
from the neighbor.
• Attempt - Indicates that no recent information has been
received from the neighbor, but that a more concerted effort
should be made to contact the neighbor
• INIT - Indicates that the Hello packet has recently been seen
from the neighbor. However, bidirectional communication
has not yet been established with the neighbor.
• 2-Way - Communication between the two routers is
bidirectional.
• ExStart - 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 - Router is describing its entire link state database
by sending Database Description packets to the neighbor.
• Loading - 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 - The neighboring routers are fully adjacent. These
adjacencies will now appear in router-LSAs and
network-LSAs.
Router ID The router ID of the neighbor.
Master The state of the neighbor: master or slave.
DD Number The hexadecimal number used to sequence the collection of
Database Description Packets. The initial value (indicated by the
Init bit being set) should be unique. The DD sequence number
then increments until the complete database description has
been sent.
DR Priority Displays the DR Priority of the neighboring router.
This is used to determine whether this neighbor is eligible to
become the Backup Designated Router. If 0, the router is
ineligible to become the Backup Designated Router.
E-Option The method used to flood AS-external-LSAs.
T-Option Specifies whether this neighbor is an ASBR.
MC-Option Specifies whether this neighbor supports MOSPF.