Specifications

Chapter 7 Configuring Frame Relay
ISDN as a Backup Connection with Floating Static Routes
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Cisco 1700 Series Router Software Configuration Guide
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Verifying Your Configuration
Follow these steps to verify that the ISDN line is configured to back up the
Frame Relay line:
Step 1 Bring the Frame Relay connection down. This clears the routing table of all routes
learned from the Frame Relay interface.
Step 2 Use the ping command to test connectivity to any central-site router that is on the
192.168.0.0 network. This should cause the ISDN line to connect dynamically and
dial the central-site router.
Step 3 Bring the Frame Relay connection back up, and confirm that the ISDN link
disconnects.
Troubleshooting Floating Static Route Problems
If you are having problems or if the output that you received during the
verification steps is very different from that shown in the command output
examples, you can troubleshoot your router with the Cisco IOS debug commands.
The debug commands provide extensive command output that is not included in
this document.
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.
Following are debug commands that are helpful when troubleshooting ISDN with
IP and IPX routing. Follow these commands with the ping command to display
debug output:
• debug dialer events
• debug isdn events
• debug isdn q931
• debug isdn q921
• debug ppp negotiation