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Configuring an OSPF Demand Circuit Interface

A demand circuit is a connection on which you can limit traffic based on user agreements. The demand circuit can limit bandwidth or access time based upon agreements between the provider and user.

Demand circuits can be used to implement Integrated Services Digital Network (ISDN). For this application, demand circuits are configured on point-to-point and point-to-multipoint interfaces. For more information on ISDN, see the Advanced WAN Access Configuration Guide.

Demand circuits can be configured on an OSPF interface. When the interface becomes a demand circuit, all hello packets and link-state advertisements are suppressed as soon as OSPF synchronization is achieved. Hello packets and link-state advertisements are sent and received on a demand-circuit interface only when there is a change in the network topology. This reduces the amount of traffic through the OSPF interface.

To configure an OSPF interface as a demand circuit, include the demand-circuit statement:




area area-id {

demand-circuit;
}

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

A demand-circuit interface automatically negotiates demand-circuit connection with its OSPF neighbor. If the neighbor does not support demand circuits, then no demand circuit connection is established.

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