User Manual

OSPF and OSPFv3
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M6100, M5300, and M7100 Series Managed Switches
LSA Ack Interval (secs) The number of seconds to wait before sending a delayed
acknowledgement.
State The state of the selected router interface. State is one of the following:
• 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.
• Loopback. The router's interface to the network is looped back either in
hardware or software. The interface is unavailable for regular data
traffic.You can get information on the quality of this interface by sending
ICMP pings to the interface or through something like a bit error test.
For this reason, IP packets can still be addressed to an interface in
loopback state. To facilitate this, such interfaces are advertised in
router- LSAs as single host routes, whose destination is the IP interface
address.
• Waiting. The router is trying to determine the identity of the backup
designated router for the network by monitoring received hello packets.
The router cannot elect a backup designated router or a designated
router until it transitions out of the waiting state. This prevents
unnecessary changes of the backup designated router.
• 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 contains 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 LSA flooding, as
compared to the designated router.
• Other Designated Router. The interface is connected to a broadcast
on which other routers are the designated router and backup
designated router. The router attempts to form adjacencies to both the
designated router and the backup designated router.
Designated Router The identity of the designated router for this network, in the view of the
advertising router. The designated router is identified here by its router ID.
The value 0.0.0.0 means that there is no designated router. This field
displays only if the OSPF admin mode is enabled.
Backup Designated Router The identity of the backup designated router for this network, in the view of
the advertising router. The backup designated router is identified here by its
router ID. Set to 0.0.0.0 if there is no backup designated router.
Number of Link Events The number of times the specified OSPF interface changed its state.
Local Link LSAs The number of opaque LSAs whose flooding scope is the link on this
interface.
Local Link LSA Checksum The sum of the checksums of local link LSAs for this link.
Table 149. OSPF Interface Configuration (continued)
Field Description