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State is the functional level of the interface between adjacent
neighbors, as follows:
Down Inoperable interface.
Loopback Self-referential interface: not attached to a
network.
Waiting An initial packet has been sent, and the
interface is waiting to hear from other
routers before selecting the designated router.
Point-to-Point A point-to-point interface does not select a
designated router.
DR The designated router on this interface.
DR Other Neither the designated nor backup
designated router on this interface.
Backup The backup designated router on this interface.
Cost lists the cost of sending a packet on the interface, expressed
with the link state metric.
DR lists the designated router selected for the attached network.
BDR lists the backup designated router selected for the attached
network.
Using the Network Control Language
Managing the Open Shortest Path First Protocol
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