Cisco Systems OL-4580-01 manual Field, Description, 3-31

Chapter 3 Configuring Open Shortest Path First (OSPF)

Showing OSPF Information

Table 3-5 Field Descriptions for show ospf interfaces Command (continued)

Field

State

Description

The functional level of an interface. The state determines whether full adjacencies are allowed to form over the interface. The states include:

•Down - The initial interface state. In this state, the lower-level protocols indicate the interface is unusable. No protocol traffic is sent or received on the interface.

•Waiting - The router is trying to determine the identity of the (backup) designated router for the network. To determine the router identify, the router monitors the hello packets it receives. The router is not allowed to elect a backup designated router nor a designated router until it transitions out of the Waiting state.

•DR Other - The interface is on a network on which another router has been selected to be the designated router. In this state, the router itself has not been selected as the backup designated router. The router forms adjacencies to both the designated router and the backup designated router.

•Backup - The router itself is the backup designated router on the attached network. The router is the designated router when 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 flooding procedure, as compared to the designated router.

•DR - The router itself 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 itself, attached to the network.

	Cisco Content Services Switch Routing and Bridging Configuration Guide
OL-4580-01		3-31