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Community Member

VIC2 2BRI NTTE BRI ISDN status

Hi,

The L2 for the ISDN line keeps going UP and down and it is State = MULTIPLE_FRAME_ESTABLISHED.

I have attached a file showing my BRI Config, and the errors I am getting. Is this a telco issue?

11 REPLIES
Hall of Fame Super Gold

Re: VIC2 2BRI NTTE BRI ISDN status

Hi, which IOS is this ? debug isdn q921 should give some more indication.

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

The IOS verion is flash:c2800nm-spservicesk9-mz.124-11.XW2.bin

Debug isdn q921:

*Sep 3 20:11:14.219: ISDN BR0/0/1 Q921: User TX -> IDVER ri=0 ai=0

*Sep 3 20:11:16.215: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/1, TEI 0 changed to down

*Sep 3 20:11:16.215: ISDN BR0/0/1 Q921: L2_EstablishDataLink: sending SABME

*Sep 3 20:11:16.215: ISDN BR0/0/1 Q921: User TX -> SABMEp sapi=0 tei=0

*Sep 3 20:11:16.247: ISDN BR0/0/0 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:16.247: ISDN BR0/0/1 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:16.247: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/1, TEI 0 changed to up

*Sep 3 20:11:16.251: ISDN BR0/0/0 Q921: User TX -> IDVER ri=0 ai=0

*Sep 3 20:11:18.251: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/0, TEI 0 changed to down

*Sep 3 20:11:18.251: ISDN BR0/0/0 Q921: L2_EstablishDataLink: sending SABME

*Sep 3 20:11:18.251: ISDN BR0/0/0 Q921: User TX -> SABMEp sapi=0 tei=0

*Sep 3 20:11:18.283: ISDN BR0/0/0 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:18.283: ISDN BR0/0/1 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:18.283: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 0 changed to up

*Sep 3 20:11:18.287: ISDN BR0/0/1 Q921: User TX -> IDVER ri=0 ai=0

*Sep 3 20:11:20.287: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/1, TEI 0 changed to down

*Sep 3 20:11:20.287: ISDN BR0/0/1 Q921: L2_EstablishDataLink: sending SABME

*Sep 3 20:11:20.287: ISDN BR0/0/1 Q921: User TX -> SABMEp sapi=0 tei=0

*Sep 3 20:11:20.319: ISDN BR0/0/0 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:20.319: ISDN BR0/0/1 Q921: User RX <- UAf sapi=0 tei=0

*Sep 3 20:11:20.319: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/1, TEI 0 changed to up

Hall of Fame Super Gold

Re: VIC2 2BRI NTTE BRI ISDN status

Hi,

to what are you connecting to ? There is no answer to IDVER packet. Try configuring 'isdn skipsend-idverify'.

hope this helps, please rate post if it does!

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

i have no eyes on the site, working remotely. But I think the BRI cards are connected to a TA. The engineer says a cable from the telco terminates on a box, and from that box two cat 5 cables are termintated on the cards on the router.

the isdn skipsend-idverify command, is this a global or int bri command? and what does it do exactly

Hall of Fame Super Gold

Re: VIC2 2BRI NTTE BRI ISDN status

Hi,

1st of all, Ethernet Cat 5 cables are wrong for BRI. The twisting of pairs is different. This may cause problem on lengthy wires, however it does not appear to be your case. Anyway a possibility is that the TA does not receive any data from router. Actually, if you are conecting to a telco circuit, the box is called an NT and not a TA.

Please rewire per standard BRI S/T pinout as specified in the interface manual.

The skipsend command, hidden in interface config mode prevents the router to use ID verify sequence that actually is standard in bringing layer 2 up.

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

Thanks.

i tried the isdn skipsend-idverify command, and it stopped flapping. I am now able to make outbound calls on one of the ports.

However the other port L2 is TEI_Asigned. It is not the BRI Cards, as I swapped the cabling around and the working port went down.

what I have noticed is that both ports will not stay in multiple-frame established state. Whichever port I shut and no shut on, stays in established state and the other port is TEI_Assigned.

If i take out the isdn skipsend-idverify, both ports begin to go up and down again.

what is the link for the correct pin outs for BRI Voice Card?

Any more ideas. Thanks

Hall of Fame Super Gold

Re: VIC2 2BRI NTTE BRI ISDN status

Seems like a cabling issue. check:

http://cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080094b76.shtml

table for BRI S/T pinout, in short 3, 4, 5 and 6. If you only have cat 5 cable as opposed to flat cable, make sure pairs twist is on 3,4 and 5, 6. Do not connect the other pins.

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

I've got a standard Cat 5 cable plugged into our BRI and that works fine. (UK, BRI connected to and ISDN2)

Hall of Fame Super Gold

Re: VIC2 2BRI NTTE BRI ISDN status

I didn't say it won't work, in fact it does, but because the pair twisting is different, you can have problem on longer distances.

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

Well I shall remember that for future installations

Community Member

Re: VIC2 2BRI NTTE BRI ISDN status

Hi.

Now i have the same problem of yuo

Are you repair this problem?

can you help me??

thanks

Alfonso

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