Netgear M5300-28G3 (GSM7328Sv2h2) - ProSAFE 24+4 Gigabit Ethernet L3 Managed Stackable Switch Software Guide

You can view statistics for the selected interface. The information is displayed only if OSPFv3 
is enabled.

State (continued.)

. The router's interface to the network is looped back in either 

the hardware or software. The interface is unavailable for regular data 
traffic. However, you might want to gain information about the quality of 
this interface, either through 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.

. The router is trying to determine the identity of the backup 

designated router for the network 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.

. 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.

. 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 
procedure, as compared to the designated router.

. The interface is connected to a broadcast 

or NBMA network on which other routers were selected to be either the 
designated router or backup designated router. The router attempts to 
form adjacencies to both the designated router and the backup 
designated router.

The state is displayed only if the OSPFv3 Admin mode is enabled.

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 OSPFv3 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.

This field displays only if the OSPFv3 admin mode is enabled.

Number of Link Events

This is the number of times the specified OSPF interface changed its state.

This field displays only if the OSPFv3 admin mode is enabled.