"International Link Busy" x25 debug message

[sboukef]

Hello

I have multiple Automated Teller Machines connecting to a Cisco 2620XM router acting like an x25 PAD and translating x25 sessions into TCP/IP ones.

Five ATMs connect properly to the router, but the sixth one fails with the following debug output (debug x25, debug translate, debug pad) :

*Mar 1 00:05:26.935: Serial0/0: X.25 I R1 Call (13) 8 lci 8

*Mar 1 00:05:26.935: From (6): 070321 To (3): 115

*Mar 1 00:05:26.935: Facilities: (0)

*Mar 1 00:05:26.935: Call User Data (3): 0x474142 (unknown)

*Mar 1 00:05:26.939: pad_svc_announce: destination matched 5

*Mar 1 00:05:26.939: PAD: Can not allocate a line Cause: 13 Diag: 116

*Mar 1 00:05:26.939: Serial0/0: X.25 O R1 Clear (5) 8 lci 8

*Mar 1 00:05:26.939: Cause 13, Diag 116 (Not obtainable/International link busy)

*Mar 1 00:05:27.019: Serial0/0: X.25 I R1 Clear Confirm (3) 8 lci 8

Is there a maximum limit number for the VCs on the router or is there another reason for this problem ?

Thank you sincerely for your help.

[Kevin Dorrell]

Regarding the number of VCs, there is no limit I am aware of. BUT, one of the most common configuration errors in X.25 is a mismatch between the channels configured on the DTE (equipment) and the DCE (exchnage/switch).

With earlier implementations, if the DTE made a call on a channel (lci) that was not recognised by the DCE, the DCE would ignore it, leaving the user wondering what was wrong. Nowadays, the DCE responds with something more useful, and I guess that is what is happening here.

Find out what the LCI range is configured on the X.25 switch, and make sure your ltc and htc parameters match that.

Kevin Dorrell

Luxembourg

[sboukef]

It seems there is a map between X.25 VCs and virtual lines, which are limited to 5.

The IOS version is 12.3(9). Is there a way to increase the maximum number of vty lines ?

[Kevin Dorrell]

Try line vty 5 32

Kevin Dorrell

Luxembourg

[sboukef]

Well done, it worked !

Thank you a lot.

[Kevin Dorrell · Accepted solution]

I'm glad it is working now. The number 32 was picked out of the air, so it may be more than the number of VTYs allowed. If so, I'm sure the CLI told you how many are actually allowed in your particular router (it varies with the model). Of course, you can put other useful configuration options under the "line vty" command.

If you found the information useful, please don't forget to "rate the post", and check the "solution" box. Thanks.

Kevin Dorrell

Luxembourg