ISDN Layer 2 debug Commands

Router#debug isdn q921

* Shows data-link layer messages (Layer 2) on the D channel between the access router and the ISDN

switch

© 2004 Cisco Systems, Inc. All rights reserved. BCRAN v2.1—6-3

To monitor Layer 2 problems, use the debug isdn q921 EXEC command. The command displays real-time data-link layer (Layer 2) access procedures that are taking place at the access router on the D channel (LAPD) of its ISDN interface. This command is useful when you want to observe signaling events between the access router and the ISDN switch.

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