TP-Link T3700G-52TQ User Manual page 238

State:
Designated Router:
Displays the current state of the selected router interface.
One of the following:
Down: This is the initial interface state. In this state, the

lower-level protocols have indicated that the interface
is unusable. In this state, interface parameters will be
set to their initial values. All interface timers will be
disabled, and there will be no adjacencies associated
with the interface.
Loopback: In this state, the router's interface to the

network is looped back either in hardware or software.
The interface is unavailable for regular data traffic.
However, it may still be desirable to gain information on
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 may 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
interface IP address.
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.
DR: This router is itself 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 will contain links to all routers (including
the Designated Router itself) attached to the network.
BDR: This router is itself the Backup Designated Router

on the attached network. It will be promoted to
Designated Router if the present Designated Router
fails. The router establishes adjacencies to all other
routers attached
Designated Router performs slightly different functions
during the Flooding Procedure, as compared to the
Designated Router.
DR Other: The interface is connected to a broadcast on

which other routers have been 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.
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.
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to the network. The Backup