05-04-2008 06:15 PM
Hello all,
Currently trying to troubleshoot some dialin issues that we are having. We have a cisco router connected to various modems through an Async card.
Currently the dial-up is not working correctly, the call connects, then drops after the inital connection, never getting to our authentication server.
I haven't really dealt with these issues before, is there any debug commands that I can run to see exactly where the call is failing, and why?
Thanks for any help.
Jon
Solved! Go to Solution.
05-09-2008 03:32 PM
We have a flapping T1 line and need to get in touch with the telco, this is not an Access server problem but a telco T1 line problem. Let me explain what is happening here:
The incoming modem call get connected on the ISDN layer (initially we the isdn status as normal) and is then gets transferred to the modem, the two modem (calling and called) reach a trainup state followed by the T1 resetting causing the modem call to drop.
See explanations marked with annotation
--------------------------------------------
*Mar 1 21:19:12: %ISDN-6-CONNECT: Interface Serial0/0:22 is now connected to XXXXXXXXXX
---------------------------------------------
Modem 1/21 Mica: in modem state CALL_SETUP
Modem 1/21 Mica: in modem state CONNECT
Modem 1/21 Mica: in modem state LINK
Modem 1/21 Mica: in modem state TRAINUP
*Mar 1 21:19:37: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down
--------------------------------------------
*Mar 1 21:19:39: %LINK-5-CHANGED: Interface Serial0/0:23, changed state to reset
21:19:39: ISDN Se0/0:23: Could not bring up interface
21:19:39: ISDN Se0/0:23: Event: received MNL_RESET_REQ
21:19:41: ISDN Se0/0:23: Could not bring up interface
21:19:41: ISDN Se0/0:23: Event: received MNL_RESET_REQ
21:19:42: ISDN Se0/0:23: Could not bring up interface
21:19:42: ISDN Se0/0:23: Event: received MNL_RESET_REQ
*Mar 1 21:19:51: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
---------------------------------------------
*Mar 1 21:19:51: %CSM-5-PRI: add ISDN at slot 0, unit 0, channel 23 with index 0
*Mar 1 21:19:53: %LINK-3-UPDOWN: Interface Serial0/0:23, changed state to up
*Mar 1 21:19:57: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0:23, TEI 0 changed to down
21:19:57: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:01: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:05: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:09: ISDN Se0/0:23: Event: received NL_REL_IND
Thanks, Mak
05-04-2008 08:30 PM
Jon, can you please provide more details on the setup, that is, the type of async card, the types of modems connected to them (I am assuming these are external modems connected to an async card), the configuration on the router etc?
Is this being configured for PPP? Have you tried an exec call and see if it works?
Thanks, Mak
05-05-2008 03:25 AM
Yes this is being configured for PPP.
Can you explain the exec call ? Not sure what this is.
I can provide more information about the modems when I actually look at them :P. Unfortuantley I cannot provide configs, I can give general information, but nothing too in depth.
Thanks,
Jon
05-05-2008 03:40 AM
Jon
The request from Mak is very reasonable. We need certain levels of information to be able to provide good suggestions. If you are restricted to "nothing too in depth" then you make it impossible for us to help you.
HTH
Rick
05-06-2008 08:52 AM
Of course :), I understand that you need information to troubleshoot, but theres only so much information that I can post.
This has been working for the past 2 years, and I haven't been involved in troubleshooting this before, it was kind of a "set it and forget it" requirement.
We actually have 2 dial in solutions, an ISDN pri, and a dial-in solution. Both quit working, so now I'm trying to troubleshoot the primary one which is the ISDN PRI.
Config snippets follow -
Controller T1 0/0
framing esf
linecode b8zs
pri-group timeslots 1-24
interface loopback0
ip address 192.168.1.1 255.255.255.0
interface fa0/0
ip address x.x.x.x 255.255.255.0
no ip redirects
no ip unreachables
no ip mroute-cache
speed auto
half-duplex
interface s0/0:23
no ip address
no ip redirects
no ip unreachables
encapsulation ppp
dialer rotary-group 0
isdn switch-type primary-ni
isdn incoming-voice modem
no fair-queue
no cdp enable
interface Group-Async1
ip unnumbered loopback0
no ip redirects
no ip unreachables
encapsulation ppp
dialer in-band
dialer idle-timeout 28800
peer default ip address pool XXXXXXX-group1
no cdp enable
ppp authentication chap pap dialin
group-range 33 56
interface dialer0
ip unnumbered loopback0
no ip redirects
no ip unreachables
encapsulation ppp
no ip mroute-cache
dialer in-band
dialer idle-timeout 28800
dialer-group 1
peer default ip address pool dialin_pool
no fair-queue
no cdp enable
ppp authentication chap pap dialin
ppp multilink
ip local pool XXXXXXX-group1 X.X.X.X - X.X.X.X
ip classless
line 33 56
login authentication async
modem InOut
transport output none
autoselect during-login
autoselect ppp
If any of this seems wrong, again let me know, I'm not the one who set it up, and its my first time troubleshooting a remote access solution, I have router / switching / voip knowledge, so I've been chosen to fix this :)
Thanks for any help!
05-06-2008 05:41 PM
Looking at the configuration it appears to be a 3600 platform with MICA (NM-24DM) modems in slot 1. It will be interesting to see if the isdn layer is fine or not and the modem status is ok or not - show isdn status and show modem is required.
Debugs to capture for an incoming call provided the above is ok:
debug isdn q931 / debug modem / debug modem csm / debug ppp nego / debug aaa authen / debug aaa authorization
Thanks, Mak
05-07-2008 12:34 AM
Not at my job right now, but I did a show isdn status yesterday, and it showed L1, active, L2 Multiple frame established.
This is correct right?
05-07-2008 06:32 AM
05-09-2008 03:20 AM
Any help would be greatly appreciated :), still having the same issues.
05-09-2008 03:32 PM
We have a flapping T1 line and need to get in touch with the telco, this is not an Access server problem but a telco T1 line problem. Let me explain what is happening here:
The incoming modem call get connected on the ISDN layer (initially we the isdn status as normal) and is then gets transferred to the modem, the two modem (calling and called) reach a trainup state followed by the T1 resetting causing the modem call to drop.
See explanations marked with annotation
--------------------------------------------
*Mar 1 21:19:12: %ISDN-6-CONNECT: Interface Serial0/0:22 is now connected to XXXXXXXXXX
---------------------------------------------
Modem 1/21 Mica: in modem state CALL_SETUP
Modem 1/21 Mica: in modem state CONNECT
Modem 1/21 Mica: in modem state LINK
Modem 1/21 Mica: in modem state TRAINUP
*Mar 1 21:19:37: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down
--------------------------------------------
*Mar 1 21:19:39: %LINK-5-CHANGED: Interface Serial0/0:23, changed state to reset
21:19:39: ISDN Se0/0:23: Could not bring up interface
21:19:39: ISDN Se0/0:23: Event: received MNL_RESET_REQ
21:19:41: ISDN Se0/0:23: Could not bring up interface
21:19:41: ISDN Se0/0:23: Event: received MNL_RESET_REQ
21:19:42: ISDN Se0/0:23: Could not bring up interface
21:19:42: ISDN Se0/0:23: Event: received MNL_RESET_REQ
*Mar 1 21:19:51: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
---------------------------------------------
*Mar 1 21:19:51: %CSM-5-PRI: add ISDN at slot 0, unit 0, channel 23 with index 0
*Mar 1 21:19:53: %LINK-3-UPDOWN: Interface Serial0/0:23, changed state to up
*Mar 1 21:19:57: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0:23, TEI 0 changed to down
21:19:57: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:01: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:05: ISDN Se0/0:23: Event: received NL_REL_IND
21:20:09: ISDN Se0/0:23: Event: received NL_REL_IND
Thanks, Mak
05-12-2008 03:38 AM
Thanks so much for the help, I'm working w/ our carrier now.
Again, this was much appreciated, thanks for taking the time out.
Jon
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