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Configuring the Priority for Becoming the Designated Router

A router advertises its priority to become a designated router in its hello packets. On all multiaccess networks, IS-IS uses the advertised priorities to elect a designated router for the network. This router is responsible for sending network link-state advertisements, which describe all the routers attached to the network. These advertisements are flooded throughout a single area.

The priority value is meaningful only on a multiaccess network. It has no meaning on a point-to-point interface.

A router’s priority for becoming the designated router is indicated by an arbitrary number from 0 through 127; routers with a higher value are more likely to become the designated router. By default, routers have a priority value of 64.

To modify the interface’s priority value, include the priority statement:




priority number;

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

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