Isdn invoked with no apparently reason

Unanswered Question
Oct 12th, 2009
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Isdn backup layer 2 is constantly invoked with no reason for me as per local PTT main line is working perfectly.

By activating debug dialer events and debug isdn events, I can't get relevant informations.

I attached sh ver/sh run/debug results

Thanks



Oct 12 12:37:09: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 70 changed to down

Oct 12 12:52:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 71 changed to up

Oct 12 12:53:09: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 71 changed to down



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Overall Rating: 4.1 (6 ratings)
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Paolo Bevilacqua Mon, 10/12/2009 - 07:54
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That is normal, configure "isdn tei-negotiation preserve" so the tei will not be negotiated every time L2 goes up.

Paolo Bevilacqua Tue, 10/13/2009 - 02:58
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You are welcome, please remember to rate useful posts with the scrollbox below.

maghisi-2007 Tue, 10/13/2009 - 06:30
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Oct 13 14:12:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 13 14:13:09: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down


I implemented the isdn command suggested above but I can see isdn layer 2 is still invoked even if the main circuit never got problems today

Paolo Bevilacqua Tue, 10/13/2009 - 06:45
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Check with "debug isdn q931" and "term mon" if there is any call associated with the activation.

maghisi-2007 Wed, 10/14/2009 - 01:03
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debug isdn error is ON.

debug isdn q921 is ON. (filter is OFF)

debug isdn q931 is ON. (filter is OFF)


sh log

Oct 14 03:00:56: ISDN BR0/1/0 Q921: L2_EstablishDataLink: sending SABME

Oct 14 03:00:56: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 03:00:57: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 03:00:57: ISDN BR0/1/0 Q921: User RX <- UAf sapi=0 tei=83

Oct 14 03:00:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 03:01:07: ISDN BR0/1/0 Q921: User TX -> RRp sapi=0 tei=83 nr=0

Oct 14 03:01:07: ISDN BR0/1/0 Q921: User RX <- RRf sapi=0 tei=83 nr=0

Oct 14 03:01:10: ISDN BR0/1/0 Q921: User RX <- DISCp sapi=0 tei=83

Oct 14 03:01:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 03:01:10: ISDN BR0/1/0 Q921: User TX -> UAf sapi=0 tei=83

Oct 14 03:01:10: ISDN BR0/1/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Oct 14 03:01:20: ISDN BR0/1/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Oct 14 03:16:56: ISDN BR0/1/0 Q921: L2_EstablishDataLink: sending SABME

Oct 14 03:16:56: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 03:16:57: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 03:16:57: ISDN BR0/1/0 Q921: User RX <- UAf sapi=0 tei=83

Oct 14 03:16:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 03:17:07: ISDN BR0/1/0 Q921: User TX -> RRp sapi=0 tei=83 nr=0

Oct 14 03:17:07: ISDN BR0/1/0 Q921: User RX <- RRf sapi=0 tei=83 nr=0

Oct 14 03:17:10: ISDN BR0/1/0 Q921: User RX <- DISCp sapi=0 tei=83

Oct 14 03:17:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 03:17:10: ISDN BR0/1/0 Q921: User TX -> UAf sapi=0 tei=83

Oct 14 03:17:10: ISDN BR0/1/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Oct 14 03:17:20: ISDN BR0/1/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Oct 14 07:16:56: ISDN BR0/1/0 Q921: L2_EstablishDataLink: sending SABME

Oct 14 07:16:56: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 07:16:57: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 07:16:57: ISDN BR0/1/0 Q921: User RX <- UAf sapi=0 tei=83

Oct 14 07:16:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 07:17:07: ISDN BR0/1/0 Q921: User TX -> RRp sapi=0 tei=83 nr=0

Oct 14 07:17:07: ISDN BR0/1/0 Q921: User RX <- RRf sapi=0 tei=83 nr=0

Oct 14 07:17:10: ISDN BR0/1/0 Q921: User RX <- DISCp sapi=0 tei=83

Oct 14 07:17:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 07:17:10: ISDN BR0/1/0 Q921: User TX -> UAf sapi=0 tei=83

Oct 14 07:17:10: ISDN BR0/1/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Oct 14 07:17:20: ISDN BR0/1/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Oct 14 07:32:56: ISDN BR0/1/0 Q921: L2_EstablishDataLink: sending SABME

Oct 14 07:32:56: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 07:32:57: ISDN BR0/1/0 Q921: User TX -> SABMEp sapi=0 tei=83

Oct 14 07:32:57: ISDN BR0/1/0 Q921: User RX <- UAf sapi=0 tei=83

Oct 14 07:32:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 07:33:07: ISDN BR0/1/0 Q921: User TX -> RRp sapi=0 tei=83 nr=0

Oct 14 07:33:07: ISDN BR0/1/0 Q921: User RX <- RRf sapi=0 tei=83 nr=0

Oct 14 07:33:10: ISDN BR0/1/0 Q921: User RX <- DISCp sapi=0 tei=83

Oct 14 07:33:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 07:33:10: ISDN BR0/1/0 Q921: User TX -> UAf sapi=0 tei=83

Oct 14 07:33:10: ISDN BR0/1/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2

Oct 14 07:33:20: ISDN BR0/1/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3

Paolo Bevilacqua Wed, 10/14/2009 - 01:59
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You could enable debug bri to see if L1 activation comes from router or network.

Anyway, there are no unwanted calls and that is what matters, you can ignore the activations.


maghisi-2007 Wed, 10/14/2009 - 04:14
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Just to try I activate anyway debug bri:

Oct 14 11:32:56: BRI0/1/0: In state F3, Received code Activate request downstream, Info 2 received

Oct 14 11:32:56: BRI0/1/0 : changing state to F6

Oct 14 11:32:56: BRI0/1/0: In state F6, Received code Activation Indication with Priority to 8, Info 4 received

Oct 14 11:32:56: BRI0/1/0 : Sending PH-Activate to the layer 2

Oct 14 11:32:56: BRI0/1/0 : changing state to F7

Oct 14 11:32:56: dchan tx fifo flush, actual_time = 0

Oct 14 11:32:56: BRI0/1/0 : stop and reset timer t3

Oct 14 11:32:56: BRI0/1/0: In state F7, Transmitting code Activation Request, set Priority to 8

Oct 14 11:32:56: BRI0/1/0 : Sending MPH-ERROR Indication reporting recovery from error to layer2

Oct 14 11:32:56: dchan tx start

Oct 14 11:32:56: dchan tx intr

Oct 14 11:32:57: dchan tx start

Oct 14 11:32:57: dchan tx intr

Oct 14 11:32:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 11:33:07: dchan tx start

Oct 14 11:33:07: dchan tx intr

Oct 14 11:33:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 11:33:10: dchan tx start

Oct 14 11:33:10: dchan tx intr

Oct 14 11:33:20: BRI0/1/0: In state F7, Received code Activate request downstream, Info 2 received

Oct 14 11:33:20: dchan tx fifo flush, actual_time = 0

Oct 14 11:33:20: BRI0/1/0 : changing state to F6

Oct 14 11:33:20: BRI0/1/0 : Sending MPH-ERROR Indication reporting error to layer2

Oct 14 11:33:20: BRI0/1/0: In state F6, Received code unknown code

Oct 14 11:33:20: BRI0/1/0 : stop and reset timer t3

Oct 14 11:33:20: BRI0/1/0 : changing state to F3

Oct 14 11:33:20: BRI0/1/0 : Starting layer 1 T4

Oct 14 11:33:21: BRI0/1/0 : T4 expired

Oct 14 11:33:21: BRI0/1/0 : Sending PH-DEACTIVATE to layer2

Oct 14 11:33:21: BRI0/1/0 : changing state to F3BRI: disable channel B1

BRI: disable channel B2


Oct 14 11:33:21: BRI0/1/0: In state F3, Transmitting code Deactivate indication upstream

Oct 14 11:33:21: BRI0/1/0: In state F3, Received code Deactivate indication downstream

Oct 14 11:33:21: BRI0/1/0 : do nothingBRI: disable channel B1

BRI: disable channel B2


Oct 14 11:48:56: BRI0/1/0: In state F3, Received code Activate request downstream, Info 2 received

Oct 14 11:48:56: BRI0/1/0 : changing state to F6

Oct 14 11:48:56: BRI0/1/0: In state F6, Received code Activation Indication with Priority to 8, Info 4 received

Oct 14 11:48:56: BRI0/1/0 : Sending PH-Activate to the layer 2

Oct 14 11:48:56: BRI0/1/0 : changing state to F7

Oct 14 11:48:56: dchan tx fifo flush, actual_time = 0

Oct 14 11:48:56: BRI0/1/0 : stop and reset timer t3

Oct 14 11:48:56: BRI0/1/0: In state F7, Transmitting code Activation Request, set Priority to 8

Oct 14 11:48:56: BRI0/1/0 : Sending MPH-ERROR Indication reporting recovery from error to layer2

Oct 14 11:48:56: dchan tx start

Oct 14 11:48:56: dchan tx intr

Oct 14 11:48:57: dchan tx start

Oct 14 11:48:57: dchan tx intr

Oct 14 11:48:57: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/1/0, TEI 83 changed to up

Oct 14 11:49:07: dchan tx start

Oct 14 11:49:07: dchan tx intr

Oct 14 11:49:10: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/1/0, TEI 83 changed to down

Oct 14 11:49:10: dchan tx start

Oct 14 11:49:10: dchan tx intr

Oct 14 11:49:20: BRI0/1/0: In state F7, Received code Activate request downstream, Info 2 received

Oct 14 11:49:20: dchan tx fifo flush, actual_time = 0

Oct 14 11:49:20: BRI0/1/0 : changing state to F6

Oct 14 11:49:20: BRI0/1/0 : Sending MPH-ERROR Indication reporting error to layer2

Oct 14 11:49:20: BRI0/1/0: In state F6, Received code unknown code

Oct 14 11:49:20: BRI0/1/0 : stop and reset timer t3

Oct 14 11:49:20: BRI0/1/0 : changing state to F3

Oct 14 11:49:20: BRI0/1/0 : Starting layer 1 T4

Oct 14 11:49:21: BRI0/1/0 : T4 expired

Oct 14 11:49:21: BRI0/1/0 : Sending PH-DEACTIVATE to layer2

Oct 14 11:49:21: BRI0/1/0 : changing state to F3BRI: disable channel B1

BRI: disable channel B2


Paolo Bevilacqua Wed, 10/14/2009 - 04:51
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Activation comes from network and there is nothing you can do about.


Please review your use of the rating system, because my info is 100% complete and correct, not fairly rated with "3".

maghisi-2007 Wed, 10/14/2009 - 05:44
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Excuse me for the rating system. I didn't want to be unfair. I do not often use cisco forum and I was thinking that I should give you the best rating just at the end of the conversation. Now I know I can give you the best rating at any time. When you write that activation comes from the network do you mean that is coming from the customer Lan?

Paolo Bevilacqua Wed, 10/14/2009 - 06:32
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No, it comes from telco with no apparent reason, as mentioned you cannot do anything about, and it's not harmful in any manner.

maghisi-2007 Wed, 10/14/2009 - 23:39
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Ok thanks for all your efforts. Excuse me once again for mine previous errors. For me this conversation has been successfully closed

Paolo Bevilacqua Thu, 10/15/2009 - 04:25
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You are welcome, thank you for the nice rating and good luck.

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