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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Dial-on-Demand Routing

DDR is dynamic routing on an as-needed basis to reduce WAN communication costs. It is good for periodic connections that transfer small amounts of data. It obviously is not a solution for today's e-commerce sites. Typically, static or default routes are used. After specifying the route (if needed), define the traffic that brings up the link. It is critical to remember that any traffic, whether interesting or not, can traverse the link while it is up. The exception is broadcast/multicast unless it is specified in the dialer map. You have already configured this. The idea is to resolve a next-hop address to a phone number, which you did with the dialer map statements.

Assuming you have a route, you must next specify interesting ...

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