User Manual

OSPF and OSPFv3
417
M6100, M5300, and M7100 Series Managed Switches
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
(continued on the next page)
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 155. OSPF Virtual Link Configuration (continued)
Field Description