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The following commands are used to debug and troubleshoot the ISDN
configuration:
- The
debug isdn q921
command shows data link layer, or Layer 2, messages on the D channel
between the router and the ISDN switch. Use this command if the
show
isdn status
command does not show Layer 1 as ACTIVE and Layer 2 as MULTIPLE_FRAME_ESTABLISHED.
-
The
debug isdn q931
command shows the exchange of call setup and teardown messages of
the Layer 3 ISDN connection.
The
debug ppp authentication
command displays the PPP authentication protocol messages, including
Challenge Handshake Authentication Protocol (CHAP) packet exchanges
and Password Authentication Protocol (PAP) exchanges.
-
The
debug ppp negotiation
command displays information on PPP traffic and exchanges while the
PPP components are negotiated. This includes LCP,
authentication, and NCP exchanges. A
successful PPP negotiation will first open the LCP state, then
authenticate, and finally negotiate NCP.
-
The
debug ppp error
command displays protocol errors and error statistics associated
with PPP connection negotiation and operation. Use the
debug ppp
commands to troubleshoot a Layer 2 problem if the
show isdn status
command does not indicate an ISDN problem.
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