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


Note:

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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