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ISDN Layer 2 Problem
by Beat Rubischon 10 Mar '05

10 Mar '05

Hello! I'm trying to configure a ISDN backup link on a Cisco. Each time I reset the BRI it takes about 15 seconds until the session will be terminated from the Swisscom's side. Call out is only possible (but working) during this 15 second time frame. Layer 1 is activated permanently since several years and working OK. Following [1], I debugged the link: [1] http://www.cisco.com/warp/public/129/bri-layer2.html ---8<--- Mar 1 01:26:39: ISDN BR0 Q921: User TX -> IDREQ ri=44602 ai=127 Mar 1 01:26:39: ISDN BR0 Q921: User RX <- IDASSN ri=44602 ai=89 Mar 1 01:26:39: ISDN BR0 Q921: L2_EstablishDataLink: sending SABME Mar 1 01:26:39: ISDN BR0 Q921: User TX -> SABMEp sapi=0 tei=89 Mar 1 01:26:39: ISDN BR0 Q921: User RX <- UAf sapi=0 tei=89 Mar 1 01:26:39: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 89 changed to up Mar 1 01:26:49: ISDN BR0 Q921: User RX <- RRp sapi=0 tei=89 nr=0 Mar 1 01:26:49: ISDN BR0 Q921: User TX -> RRf sapi=0 tei=89 nr=0 Mar 1 01:26:54: ISDN BR0 Q921: User RX <- DISCp sapi=0 tei=89 Mar 1 01:26:54: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 89 changed to down Mar 1 01:26:54: ISDN BR0 Q921: User TX -> UAf sapi=0 tei=89 Mar 1 01:26:54: ISDN BR0 Q921: L2_EstablishDataLink: DISC received & not Passive-shutdown SABME will not be sent. ---8<--- Cisco says "If the DISC message originated from the ISDN switch, contact the telco." But on the Swisscom-side, nobody is able to understand my problem or willing to help. Any hint what I should say to the "Swisskomiker" to get the right solution? Anyone here who knows a magic keyword in IOS to disable the need for a permanent Layer 2 connection? Thanks! Beat -- Beat Rubischon \|/ See http://www.rubis.ch/~beat/ for <beat(a)rubis.ch> ( 0^0 ) snail- & e-mail, phone, fax & PGP ---------------oOO--(_)--OOo---------------------------------- # wigwam.lugs.ch, Linux 2.4.29-rc2, up 49 days, 0:52, load: 0.24

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Job: "Application Support Analyst"
by Nicolas FISCHBACH 09 Mar '05

09 Mar '05

Since we have a lot of *NIX people on this list I thought I may post this job offer: The position is in the technical billing team (in Zurich), the key skills are in the field of UNIX, shell/Perl scripting. (PL/)SQL is a plus and Progressor knowledge a plus plus. Juniors are welcome. Please contact Anna Feller (anne dot feller at colt dot ch - 015600608) if you want more details. Nico. -- Nicolas FISCHBACH (nico(a)securite.org) <http://www.securite.org/nico/> Senior Manager - IP Engineering/Security - COLT Telecom Securite.Org Team <http://www.securite.org/>

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AW: [swinog] New member ;)
by Bernet Nicole 07 Mar '05

07 Mar '05

Hi Salome & Everybody, Juppiiii!!! Finally another lady who's willing to join - Welcome to the club! Cheers, -Nicole ________________________________ Von: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch] Im Auftrag von Kuster, Christian Gesendet: Dienstag, 1. März 2005 14:19 An: 'swinog(a)swinog.ch' Betreff: RE: [swinog] New member ;) Hi Salome Nicole probably is very happy not to be the only woman anymore :-) You are very welcome... Cheers Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Salome Baumann Sent: Dienstag, 1. März 2005 14:17 To: swinog(a)swinog.ch Subject: [swinog] New member ;) Hi all I'm new to this list so I'd like to send you a short hello. My name is Salome and I'm a 25 years old lady :) I worked for one year in a network team at HP (configuring Cisco devices and stuff). At the moment I work as a hardware supporter but I don't like it at all, so I decided to quit and now I'm looking for a job in the Cisco environment again. I subscribed to this list because I hope to meet other networking people and to improve my technical knowledge :) Hmmm - about the beer event... I'm always interested in beer ;) is it ok when I join? Kind regards, Salome -- ...you will know the truth, and the truth will set you free! _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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SwiNOG-10 / 20th april 2005
by Michel Renfer 04 Mar '05

04 Mar '05

Dear friends! We are very happy to open the registration for SwiNOG-10. The meeting will be held at the 20th april 2005 in Berne. Acutally we have some space left in the agenda. Please let us know, if you would present a topic of interest. Of course, we have still one sponsoring partner open. Please contact us (swinog-core(a)swinog.ch), if you are interested in sponsoring SwiNOG-10. cheers, michel

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RE: [swinog] ISDN Layer 2 Problem
by Kuster, Christian 04 Mar '05

04 Mar '05

This was once an issue some time ago... Should not be anymore...We use 837's without Layer 2 permanently on. Hmm, yep, I would try another IOS,we use 12.2.13ZH2, although this one has an issue with NAT of PPTP sessions, but who's using PPTP ;-) I also tested 12.3(8)T4 which also gives no problem... If you should still have a problem after that, you still can ask Swisscom to keep layer 2 up. Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Lukas Krattiger (NOC) Sent: Donnerstag, 3. März 2005 23:32 To: swinog(a)swinog.ch Subject: RE: [swinog] ISDN Layer 2 Problem Hi Beat I agree to Roger. There is a power-save mode which affects the ISDN-Layer2. At least the BRI's from the old cisco2500 needed this feature, otherwise I saw the same behaviour. Go and ask Swisscom, they should activate the Layer2. Cheers -Lukas -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch] On Behalf Of Roger Buchwalder Sent: Donnerstag, 3. März 2005 23:12 To: swinog(a)swinog.ch Subject: Re: [swinog] ISDN Layer 2 Problem Hello Beat I remember, we had also some problems with ZyXEL-ISDN-Routers. We call then to the Swisscom, they may put the Layer 2 always to "on"-state. Maybe it helps? rog Beat Rubischon schrieb: > Hello! > > Am 03.03.05 schrieb Beat Rubischon: > > >>I'm trying to configure a ISDN backup link on a Cisco. > > > First, thanks a lot for your ideas. I have now debugged a lot and my > results are the following: > > - It's not a problem in the wiring or termination. > > - Dial-Out is possible when Layer 2 is in state > "MULTIPLE_FRAME_ESTABLISHED" (aka an running call) > or "NOT Activated" (not initialized yet) > > - Dial-Out is not possible when Layer 2 is in state > "TEI_ASSIGNED", debugging shows that the communication > simple times out. > > I assume now a bug in the IOS - 12.3(8)YA [1] is an early deployment > release. I hope to get my service contract soon to access other > images. > > [1] > http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/prod_bulletin09 > 00aecd80157bb5.html > > A disconnect of the S-Bus resets the Layer 2 and with the setting > "isdn tei-negotiation first-call" no new TEI is allocated. So I will > try to switch off Layer 1 - each time Swisscom shuts down Layer 1, my > BRI would be resetted :-) > > May be someone has another idea. I have put the config and a logfile > on [2]. > > [2] http://www.rubis.ch/isdn/ > > Beat > _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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RE: [swinog] ISDN Layer 2 Problem
by Bangerter Markus 03 Mar '05

03 Mar '05

Hi >I reset the BRI it takes about 15 seconds until the session will >be terminated from the Swisscom's side. Call out is only possible >(but working) during this 15 second time frame. If you do a cle int bri xy, then it's a normal behaviour. It will take some time until the remote receives the disc from main-site. ISDN-Layer-2 has not to be up all the time. It's only up (MULTIPLE_FRAME_ESTABLISHED) if a call is established. Is your isdn-router connected directly to an NT or behind A pbx ? (what type of pbx) Markus

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RE: [swinog] ISDN Layer 2 Problem
by Kuster, Christian 03 Mar '05

03 Mar '05

Hmm, strange... I mean it's normal that L2 deactivates... But the router should activate again (renegotiate TEI) if another call takes place (and yours is not) And in debug output, nothing seems to happen. Looks to me at he first glance as a local problem to the router... Try once the additional command on the BRI interface : isdn tei-negotiation preserve If that does not help, try again to establish a call with the following debig option turned on : debug isdn q921 debug isdn q931 debug isdn events debug bri Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Beat Rubischon Sent: Donnerstag, 3. März 2005 15:50 To: 'swinog(a)swinog.ch' Subject: RE: [swinog] ISDN Layer 2 Problem Hello! Am 03.03.05 schrieb Kuster, Christian: > What is the debugging output (or error message) if you try to establish a > call? > That should bring Layer 2 up again (but it isn't as you say) I have set up a webpage with two debug-logs: http://www.rubis.ch/isdn.html In the first case, I reset the interface and trigger the dial-out immediatly. Everything works fine. In the second case, I reset the interface and wait for the disconnect of Layer 2. Then I trigger the dial-out which wont work. Beat -- Beat Rubischon \|/ See http://www.rubis.ch/~beat/ for <beat(a)rubis.ch> ( 0^0 ) snail- & e-mail, phone, fax & PGP ---------------oOO--(_)--OOo---------------------------------- # wigwam.lugs.ch, Linux 2.4.29-rc2, up 49 days, 2:27, load: 0.17 _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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RE: [swinog] ISDN Layer 2 Problem
by Kuster, Christian 03 Mar '05

03 Mar '05

Hi It probably will help very much if you say : what router, what IOS version what BRI interface config you use... Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Beat Rubischon Sent: Donnerstag, 3. März 2005 14:22 To: SWINOG Mailing List Subject: [swinog] ISDN Layer 2 Problem Hello! I'm trying to configure a ISDN backup link on a Cisco. Each time I reset the BRI it takes about 15 seconds until the session will be terminated from the Swisscom's side. Call out is only possible (but working) during this 15 second time frame. Layer 1 is activated permanently since several years and working OK. Following [1], I debugged the link: [1] http://www.cisco.com/warp/public/129/bri-layer2.html ---8<--- Mar 1 01:26:39: ISDN BR0 Q921: User TX -> IDREQ ri=44602 ai=127 Mar 1 01:26:39: ISDN BR0 Q921: User RX <- IDASSN ri=44602 ai=89 Mar 1 01:26:39: ISDN BR0 Q921: L2_EstablishDataLink: sending SABME Mar 1 01:26:39: ISDN BR0 Q921: User TX -> SABMEp sapi=0 tei=89 Mar 1 01:26:39: ISDN BR0 Q921: User RX <- UAf sapi=0 tei=89 Mar 1 01:26:39: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 89 changed to up Mar 1 01:26:49: ISDN BR0 Q921: User RX <- RRp sapi=0 tei=89 nr=0 Mar 1 01:26:49: ISDN BR0 Q921: User TX -> RRf sapi=0 tei=89 nr=0 Mar 1 01:26:54: ISDN BR0 Q921: User RX <- DISCp sapi=0 tei=89 Mar 1 01:26:54: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 89 changed to down Mar 1 01:26:54: ISDN BR0 Q921: User TX -> UAf sapi=0 tei=89 Mar 1 01:26:54: ISDN BR0 Q921: L2_EstablishDataLink: DISC received & not Passive-shutdown SABME will not be sent. ---8<--- Cisco says "If the DISC message originated from the ISDN switch, contact the telco." But on the Swisscom-side, nobody is able to understand my problem or willing to help. Any hint what I should say to the "Swisskomiker" to get the right solution? Anyone here who knows a magic keyword in IOS to disable the need for a permanent Layer 2 connection? Thanks! Beat -- Beat Rubischon \|/ See http://www.rubis.ch/~beat/ for <beat(a)rubis.ch> ( 0^0 ) snail- & e-mail, phone, fax & PGP ---------------oOO--(_)--OOo---------------------------------- # wigwam.lugs.ch, Linux 2.4.29-rc2, up 49 days, 0:52, load: 0.24 _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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RE: [swinog] ISDN Layer 2 Problem
by Kuster, Christian 03 Mar '05

03 Mar '05

What is the debugging output (or error message) if you try to establish a call? That should bring Layer 2 up again (but it isn't as you say) Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Beat Rubischon Sent: Donnerstag, 3. März 2005 15:16 To: SWINOG Mailing List Subject: Re: [swinog] ISDN Layer 2 Problem Hello! Am 03.03.05 schrieb Erich Hohermuth: > interface BRI0 > no ip address > encapsulation ppp > no ip route-cache > no ip mroute-cache > load-interval 30 > dialer pool-member 6 > isdn switch-type basic-net3 > isdn tei-negotiation first-call > no cdp enable > ppp multilink My options: interface BRI0 description ISDN interface no ip address encapsulation ppp dialer pool-member 2 isdn switch-type basic-net3 isdn answer1 0556145044 isdn calling-number 0556145044 no cdp enable I added "isdn tei-negotiation first-call", channel bundling is no desired option: rt-1#conf t rt-1(config)#int bri0 rt-1(config-if)#isdn tei-negotiation first-call rt-1(config-if)#no ip route-cache rt-1(config-if)#no ip mroute-cache rt-1(config-if)#end Mar 3 15:11:39.332: %SYS-5-CONFIG_I: Configured from console by console rt-1#clear interface bri 0 Mar 3 15:12:05.896: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 75 changed to up (now Layer 2 is up): rt-1#show isdn status Mar 3 15:14:19.404: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 77 changep Global ISDN Switchtype = basic-net3 ISDN BRI0 interface dsl 0, interface ISDN Switchtype = basic-net3 Layer 1 Status: ACTIVE Layer 2 Status: TEI = 77, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED Layer 3 Status: 0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0 The Free Channel Mask: 0x80000003 Total Allocated ISDN CCBs = 0 (15 seconds later): Mar 3 15:12:20.864: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 75 changed to down (and Layer 2 is down): rt-1#show isdn status Global ISDN Switchtype = basic-net3 ISDN BRI0 interface dsl 0, interface ISDN Switchtype = basic-net3 Layer 1 Status: ACTIVE Layer 2 Status: TEI = 75, Ces = 1, SAPI = 0, State = TEI_ASSIGNED Layer 3 Status: 0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0 The Free Channel Mask: 0x80000003 Total Allocated ISDN CCBs = 0 Dialing is only possible while Layer 2 Status is MULTIPLE_FRAME_ESTABLISHED... Beat -- Beat Rubischon \|/ See http://www.rubis.ch/~beat/ for <beat(a)rubis.ch> ( 0^0 ) snail- & e-mail, phone, fax & PGP ---------------oOO--(_)--OOo---------------------------------- # wigwam.lugs.ch, Linux 2.4.29-rc2, up 49 days, 1:48, load: 0.21 _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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RE: [swinog] ISDN Layer 2 Problem
by Kuster, Christian 03 Mar '05

03 Mar '05

Erichs config looks good! That's why I said > what BRI interface config you use... I don't like shooting in the dark... Christian -----Original Message----- From: swinog-bounces(a)lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Erich Hohermuth Sent: Donnerstag, 3. März 2005 15:02 To: swinog(a)swinog.ch Subject: Re: [swinog] ISDN Layer 2 Problem Hello I use the following config with the 836er Cisco Routers. > I think it's more an generic problem then a product specific > one... but: interface BRI0 no ip address encapsulation ppp no ip route-cache no ip mroute-cache load-interval 30 dialer pool-member 6 isdn switch-type basic-net3 isdn tei-negotiation first-call no cdp enable ppp multilink Regards Erich -- * Erich Hohermuth IP Engineer - SolNet (AS 9044) PGPKEY-46A08FCB * * phone: +41 32 686 82 22 / sip:9044*463@inoc-dba.pch.net * _______________________________________________ swinog mailing list swinog(a)lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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