Strange ISDN q921 messages

j.huizinga · ‎10-23-2009

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

j.huizinga · ‎10-23-2009

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

paolo bevilacqua · ‎10-23-2009

Which exact IOS is this ?

j.huizinga · ‎10-23-2009

c2800nm-spservicesk9-mz.124-24.T1.bin

Thanks,

Jan

paolo bevilacqua · ‎10-23-2009

I see many trouble reports with that, you might try eg, 12.4(22)YB4.

j.huizinga · ‎10-23-2009

I shall try that.

Thanks,

Jan