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OSPF Dial-on-Demand Circuits

If you are configuring OSPF across a demand circuit such as an ISDN link, you must enable dial-on-demand routing backup on the OSPF-enabled interface. Because demand circuits do not pass all traffic required to maintain an OSPF adjacency (hello packets, for example), you configure dial-on-demand routing so individual nodes in an OSPF network can maintain adjacencies despite the lack of LSA exchanges.

To configure an ISDN link, see Configuring ISDN. For information about configuring OSPF demand circuits, see Configuring Dial-on-Demand Routing Backup with OSPF Support (Optional).

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