Troubleshooting ISDN

Router#debug isdn q921

Displays info about Layer 2 (data link layer) access taking place on the D channel

Router#debug isdn q931

Displays info about Layer 3 (network layer) call setup and teardown between your router and the service provider switch

Router#debug dialer events

Displays messages when the DDR link has connected and what traffic caused it to connect

Router#debug dialer packets

Displays a message every time a packet is sent out the DDR interface


PPP is often used as an encapsulation method when working with ISDN. Therefore, the PPP configuration commands, along with the PPP debug commands are applicable here, too.

CCNA Self-Study(c) CCNA Portable Command Guide
CCNA Portable Command Guide
ISBN: 1587201585
EAN: 2147483647
Year: 2006
Pages: 261
Authors: Scott Empson

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