User Manual

OSPF and OSPFv3
366
M4200 and M4300 Series ProSAFE Managed Switches Web Management User Manual
Neighbor State
(continued)
• Point-to-Point. The interface is operational, and is connected either to
the virtual link. On entering this state the router attempts to form an
adjacency with the neighboring router. hello packets are sent to the
neighbor every hello interval seconds.
• Designated Router. This router is the designated router on the
attached network. Adjacencies are established to all other routers
attached to the network. The router must also originate a network-LSA
for the network node. The network- LSA contain links to all routers
(including the designated router) attached to the network.
• Backup Designated Router. This router is the backup designated
router on the attached network. It is promoted to designated router if
the present designated router fails. The router establishes adjacencies
to all other routers attached to the network. The backup designated
router performs slightly different functions during the flooding
procedure, as compared to the designated router.
• Other Designated Router. The interface is connected to a broadcast
or NBMA network on which other routers were selected to be the
designated router and backup designated router either. The router
attempts to form adjacencies to both the designated router and the
backup designated router.
State The state of the interface. It takes one the following values:
• Down. This is the initial interface state. The lower-level protocols
indicated that the interface is unusable. Interface parameters are set to
their initial values. All interface timers are disabled, and there are no
adjacencies associated with the interface.
• Waiting. The router is trying to determine the identity of the backup
designated router by monitoring received hello packets. The router is
not allowed to elect a backup designated router or a designated router
until it transitions out of waiting state. This prevents unnecessary
changes of backup designated router.
• Point-to-Point. The interface is operational, and is connected either to
the virtual link. On entering this state the router attempts to form an
adjacency with the neighboring router. hello packets are sent to the
neighbor every hello interval seconds.
• Designated Router. This router is the designated router on the
attached network. Adjacencies are established to all other routers
attached to the network. The router must also originate a network-LSA
for the network node. The network- LSA contain links to all routers
(including the designated router) attached to the network.
• Backup Designated Router. This router is the backup designated
router on the attached network. It is promoted to designated router if
the present designated router fails. The router establishes adjacencies
to all other routers attached to the network. The backup designated
router performs slightly different functions during the flooding
procedure, as compared to the designated router.
Table 137. OSPF Virtual Link Configuration (continued)
Field Description