Netgear GS728TP User Manual download pdf (Page 245)

Routing

245

ProSafe M5300 Switch

State The current state of the selected router interface. One of:

• 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 IP

interface address.

• Waiting: 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.

Designated Router 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.

Backup Designated Router 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 to the

network. The Backup Designated Router performs slightly different

functions during the LSA flooding, as compared to the Designated Router.

Other Designated Router 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.

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 is

only displayed if the OSPF 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.

Number of Link Events This is the number of times the specified OSPF interface has changed its

state.

Local Link LSAs The number of opaque LSAs whose flooding scope is the link on this

interface.

Local Link LSA Checksum The sum of the checksums of local link LSAs for this link.

Field Description

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