Netgear XSM4324FS User Manual - Page 374

M4300 Intelligent Edge Series Fully Managed Stackable Switches Table 133. OSPF Interface Configuration (continued) Field State State (continued) Designated Router Backup Designated Router Number of Link Events Local Link LSAs Local Link LSA Checksum Description 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. 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. 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. The number of times the specified OSPF interface changed its state. The number of opaque LSAs whose flooding scope is the link on this interface. The sum of the checksums of local link LSAs for this link. Configure OSPF and OSPFv3 374 User Manual