03-18-2004 01:16 AM - edited 03-02-2019 02:22 PM
We have an ISDN backup to a serial link that simply does not seem to kick in. The config seems to be correct. Can someone tell me how I could run debugging to get to the bottom of the problem.
I am only just studying my CCNA and have yet to get to debugging as yet. I also be grateful if you could tell me how to turn it off afterwards. Many thanks!
Solved! Go to Solution.
03-18-2004 02:31 AM
Hello,
the debug commands you can use are:
debug isdn q921
debug isdn q931
and
debug dialer events
To turn debugging off, type:
u all
Make sure that you have at least layer 1 connectivity, you can check this by typing:
show isdn status
The output should look like this:
Global ISDN Switchtype = basic-net3
ISDN BRI1/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 81, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Number of L2 Discards = 0, L2 Session ID = 212
Total Allocated ISDN CCBs = 0
Also, to view the output of the debugging, type:
term mon
and to turn this off, type:
term no mon
HTH,
GP
03-18-2004 07:07 AM
Hello Robert,
no problem to do this via Telnet, you do not need to be connected via a Terminal.
Regards,
GP
03-18-2004 02:31 AM
Hello,
the debug commands you can use are:
debug isdn q921
debug isdn q931
and
debug dialer events
To turn debugging off, type:
u all
Make sure that you have at least layer 1 connectivity, you can check this by typing:
show isdn status
The output should look like this:
Global ISDN Switchtype = basic-net3
ISDN BRI1/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 81, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Number of L2 Discards = 0, L2 Session ID = 212
Total Allocated ISDN CCBs = 0
Also, to view the output of the debugging, type:
term mon
and to turn this off, type:
term no mon
HTH,
GP
03-18-2004 04:43 AM
Many thanks!!
Can we do this remotely via Telnet or would you have to be connected via terminal?
03-18-2004 07:07 AM
Hello Robert,
no problem to do this via Telnet, you do not need to be connected via a Terminal.
Regards,
GP
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