his document uses a Cisco 3103 (1E/1BRI) in the example. It is configured to route IP over a Dial-on-Demand Routing (DDR) link.
Switch types refer to the ISDN software that runs on the switch, and not the manufacturer or the model.
This document uses static routing, and includes only the relevant and necessary commands. Either of the routers can initiate the connection, and all IP packets are "interesting," which means that the routers can dial, and can reset the DDR idle timer. No routing protocol is configured in this example, because routing updates can keep the link up indefinitely, and incur usage charges. This configuration helps you to connect a home or remote office where IP is the only protocol in use.
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