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Cisco 1700 Series Router Software Configuration Guide
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Chapter 7 Configuring Frame Relay
ISDN as a Backup Connection with Dialer Profiles
• debug ppp authentication
• debug ppp multilink events
Caution If you are not familiar with Cisco IOS debug commands, you should read the
“Using Debug Commands” section in the “Introduction to Router
Configuration” chapter before attempting any debugging.
ISDN as a Backup Connection with Dialer Profiles
This section describes how to configure ISDN to operate as a secondary, or
backup, WAN connection by using dialer profiles to connect to multiple
central-site routers.
In addition to the assumptions listed in the “Before You Begin” section at the
beginning of this chapter, this configuration is based on the following additional
assumptions:
• The Frame Relay service provides end-to-end status of the Frame Relay
connection.
This means that if the router primary serial WAN connection (in this example,
Frame Relay) goes down, the Frame Relay switch sends LMI updates to the
central-site router, indicating that the line has gone down.
• Your router connects to two different central-site routers.
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