From: Steven M. Sowell (ssowell@xxxxxxxx)
Date: Fri Feb 15 2002 - 14:21:41 GMT-3
A good place to start with any ISDN BRI troubleshooting scenario is "show
isdn stat". It shows fundamental ISDN information in a clear format.
In the output below, "Layer 1 status" is Active. Often the source of your
problem is that Layer 1 is inactive, which is basically the physical cabling
(and proper configuration of the Telco switch/ISDN simulator) It is
typically a bad cable, bad/misconfigured switch, or you forgot to do a "no
shut" on your interface.
Once Layer 1 is ACTIVE, verify that, under Layer 2, you have "spid1 valid
spid2 valid". If it says "spid1 is invalid" you have fat-fingered your
SPIDS. Often, when you correct the invalid spids on your router they still
show up as invalid. You should do a "clear int bri0/0" or "shut/no shut" on
the BRI interface to activate the new spids. Some IOS/platforms prefer the
former, some the latter, and sometimes you have to do it a couple of times.
Familiarity with the output of "debug isdn q921" and "debug isdn q931", and
"debug ppp ????" are also vital to effective ISDN troubleshooting.
R2#sh isdn stat
Global ISDN Switchtype = basic-ni
ISDN BRI0/0 interface
dsl 0, interface ISDN Switchtype = basic-ni
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 64, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
TEI = 65, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
TEI 64, ces = 1, state = 5(init)
spid1 configured, no LDN, spid1 sent, spid1 valid
Endpoint ID Info: epsf = 0, usid = 70, tid = 1
TEI 65, ces = 2, state = 5(init)
spid2 configured, no LDN, spid2 sent, spid2 valid
Endpoint ID Info: epsf = 0, usid = 70, tid = 2
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 = 0
Total Allocated ISDN CCBs = 0
Steven Sowell
CCIE#7317
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Lupi,
Guy
Sent: Friday, February 15, 2002 10:26 AM
To: 'Kang BS'; ccielab@groupstudy.com
Subject: RE: Trouble on ISDN
I would check the physical connection to the simulator or ISDN line, this
happened to me last night and that is what it was. I believe that this
means that the router does not see the ISDN carrier signal from the line or
simulator.
~-----Original Message-----
~From: Kang BS [mailto:avantus1@hotmail.com]
~Sent: Friday, February 15, 2002 9:55 AM
~To: ccielab@groupstudy.com
~Subject: Trouble on ISDN
~
~
~Hi, all
~
~
~When I call to the other side of router thru BRI interface,
~"wait for isdn carrier timeout" message come out.
~
~Could you anyone explain on what the message mean and What should I do?
~
~Thanks in advance.
~
~BS Kang
~
~
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