Section 3: ISDN (4 Points)
Ensure that the ISDN is used should the Frame Relay network fail; use a Layer 3 method of invoking the line. Make R1 initiate the call. Use CHAP for authentication.
You have two methods of providing Layer 3 ISDN backup, Dialer Watch and an OSPF Demand circuit. As you have not been provided with which networks in particular require backing up, you have to configure the Demand circuit. When you configure an OSPF demand circuit, you should be aware that any topology change will cause your ISDN circuit to become active so you must ensure you have a stable network; otherwise, your line will constantly be connected. You configure only one end of the link with the ip ospf demand-circuit command and this should be placed on ...
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