user manual

3-31
Cisco Content Services Switch Routing and Bridging Configuration Guide
OL-4580-01
Chapter 3 Configuring Open Shortest Path First (OSPF)
Showing OSPF Information
State 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.
Table 3-5 Field Descriptions for show ospf interfaces Command (continued)
Field Description