Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

Silver

Strange ISDN q921 messages

Hi,

Sometimes one of the BRI lines gets this q921 messages:

ISDN BR0/2/1 Q921: L2_EstablishDataLink: sending SABME

ISDN BR0/2/1 Q921: User TX -> RRf sapi=0 tei=123 nr=2

ISDN BR0/2/1 Q921: User TX -> SABMEp sapi=0 tei=123

ISDN BR0/2/1 Q921: User RX <- SABMEp sapi=0 tei=123

ISDN BR0/2/1 **ERROR**: L2_AdvanceVA: TX_ack_queue empty

This is already weird, but what I don't understand is the SABME message being received.

Anyone seen this, or knows what it might be?

Thanks,

JH

1 REPLY
Bronze

Re: Strange ISDN q921 messages

Indicates that a supplementary service requested by the user cannot be provided by the

network. So this points to a TELCO issue and not BRI issue

also,

This symptom is observed when a cable is pulled out and put back

rapidly.

Enter the shutdown command followed

by the no shutdown command on the affected BRI interface

204
Views
0
Helpful
1
Replies