Specifications

5-29
Cisco 1700 Series Router Software Configuration Guide
78-5407-03
Chapter 5 Configuring ISDN
Leased-Line ISDN Connection to a Central-Site Router
Troubleshooting Dialer Profile 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, using 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.
The following are debug commands that are helpful in troubleshooting dialer
profiles with ISDN. You need to follow most of these commands with the ping
command to display debug output:
• debug dialer
• debug isdn events
• debug dialer events
• debug isdn q931
• debug isdn q921
• debug ppp negotiation
• debug ppp authentication
• debug ppp multilink events
Leased-Line ISDN Connection to a Central-Site
Router
This section describes how to configure the router so that it uses the ISDN line as
a leased-line connection to the central-site router. Unlike a switched connection
to the central-site router, in which the router dials the central-site router only
when it detects specified types and amounts of data traffic, a leased-line ISDN
connection is always connected to the central office switch.