5.4 Configuring Dial on Demand Routing (DDR)
5.4.1 Initiating connections
Connections initiated by remote offices or telecommuters are brought up on an as-needed basis, resulting in substantial cost savings for the company. In DDR scenarios, users are not connected for long periods of time. The number of remote nodes requiring access is relatively low, and the completion time for the dial-in task is short.

A spoke router is the link between a stub network and the WAN. A stub network has only a single connection to a router. Following are the steps involved in configuring a spoke router for DDR.

  1. Define what constitutes interesting traffic by using the dialer-list command.
  2. Assign this traffic definition to an interface by using the dialer-group command.
  3. Define the destination address, hostname, telephone number to dial, and optional call parameters by using the dialer map command.
  4. Define call parameters by using commands such as dialer idle-timeout, dialer fast-idle, and dialer load-threshold.