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  1. Junior Member Registered Member
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    #1

    Default Back-To-Back T1 ( VWIC-2MFT-T1 )

    Hello ! I'm trying to create a Back-To-Back T1 connection to simulate a PSTN in a Lab environment. But I still had no success.
    I'm using two Cisco Routers ( CISCO2811 - Version 15.1(4)M8, and CISCO2801 - Version 12.4(13r)T ) with a VWIC-2MFT-T1 card each.
    Maybe someone here can help me. Follow my config and some debugs bellow.
    Router1:
    !
    network-clock-participate wic 3
    isdn switch-type primary-ni
    !

    controller T1 0/3/0
    clock source internal
    cablelength short 133
    pri-group timeslots 1-2,24

    !
    interface Serial0/3/0:23
    no ip address
    encapsulation hdlc
    no logging event link-status
    isdn switch-type primary-ni
    isdn protocol-emulate network
    isdn incoming-voice voice
    no cdp enable

    !
    voice-port 0/3/0:23
    !

    !
    dial-peer voice 5000 pots
    destination-pattern 50..
    incoming called-number .
    direct-inward-dial
    port 0/3/0:23
    forward-digits all
    !


    Router1#sh controller t1


    T1 0/3/0 is up.
    Applique type is Channelized T1
    Cablelength is short 133
    No alarms detected.
    alarm-trigger is not set
    Soaking time: 3, Clearance time: 10
    AIS State:Clear LOS State:Clear LOF State:Clear
    Version info Firmware: 20090113, FPGA: 20, spm_count = 0
    Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
    CRC Threshold is 320. Reported from firmware is 320.
    Data in current interval (235 seconds elapsed):
    2 Line Code Violations, 1143 Path Code Violations
    0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 107 Unavail Secs
    Total Data (last 94 15 minute intervals):
    1 Line Code Violations, 2526 Path Code Violations,
    0 Slip Secs, 0 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins,
    0 Errored Secs, 0 Bursty Err Secs, 2 Severely Err Secs, 1650 Unavail Secs
    T1 0/3/1 is down.
    Applique type is Channelized T1
    Cablelength is long gain36 0db
    Transmitter is sending remote alarm.
    Receiver has loss of signal.
    alarm-trigger is not set
    Soaking time: 3, Clearance time: 10
    AIS State:Clear LOS State:Failure LOF State:Failure
    Version info Firmware: 20090113, FPGA: 20, spm_count = 0
    Framing is ESF, Line Code is B8ZS, Clock Source is Line.
    CRC Threshold is 320. Reported from firmware is 320.
    Data in current interval (237 seconds elapsed):
    0 Line Code Violations, 0 Path Code Violations
    0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 237 Unavail Secs
    Total Data (last 94 15 minute intervals):
    0 Line Code Violations, 0 Path Code Violations,
    0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 84600 Unavail Secs

    Router1#sh isdn status
    Load for five secs: 12%/7%; one minute: 12%; five minutes: 10%
    Time source is NTP, 10:27:14.030 GMT Wed Mar 29 2017

    Global ISDN Switchtype = primary-ni
    ISDN Serial0/3/0:23 interface
    ******* Network side configuration *******
    dsl 0, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
    DEACTIVATED
    Layer 2 Status:
    TEI = 0, 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: 0x00000000
    Number of L2 Discards = 0, L2 Session ID = 150
    Total Allocated ISDN CCBs = 0



    Router1#debug isdn q921
    084215: Mar 29 10:29:58.511 GMT: ISDN Se0/3/0:23 Q921: L2_EstablishDataLink: sending SABME
    084216: Mar 29 10:29:58.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    084217: Mar 29 10:29:59.023 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084218: Mar 29 10:29:59.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    Router1#
    084219: Mar 29 10:30:00.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084220: Mar 29 10:30:00.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    084221: Mar 29 10:30:01.023 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    Router1#
    084222: Mar 29 10:30:01.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    084223: Mar 29 10:30:02.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084224: Mar 29 10:30:02.511 GMT: ISDN Se0/3/0:23 Q931: Ux_DLRelInd: DL_REL_IND received from L2
    Router1#
    084225: Mar 29 10:30:07.511 GMT: ISDN Se0/3/0:23 Q921: L2_EstablishDataLink: sending SABME
    084226: Mar 29 10:30:07.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    084227: Mar 29 10:30:08.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084228: Mar 29 10:30:08.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    Router1#
    084229: Mar 29 10:30:09.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084230: Mar 29 10:30:09.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    Router1#084231: Mar 29 10:30:10.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084232: Mar 29 10:30:10.511 GMT: ISDN Se0/3/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    Router1#
    084233: Mar 29 10:30:11.019 GMT: ISDN Se0/3/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    084234: Mar 29 10:30:11.511 GMT: ISDN Se0/3/0:23 Q931: Ux_DLRelInd: DL_REL_IND received from L2 ................

    Router2:
    network-clock-participate wic 2
    network-clock-select 1 T1 0/2/0

    !
    isdn switch-type primary-ni
    !

    !
    controller T1 0/2/0
    cablelength short 133
    pri-group timeslots 1-2,24

    !
    interface Serial0/2/0:23
    no ip address
    encapsulation hdlc
    no logging event link-status
    isdn switch-type primary-ni
    isdn protocol-emulate network
    isdn incoming-voice voice
    no cdp enable
    !
    voice-port 0/2/0:23

    !
    dial-peer voice 999 pots
    destination-pattern 2000
    incoming called-number .
    direct-inward-dial
    port 0/2/0:23
    forward-digits all
    !

    Router2#sh controllers t1

    T1 0/2/0 is up.
    Applique type is Channelized T1
    Cablelength is short 133
    No alarms detected.
    alarm-trigger is not set
    Soaking time: 3, Clearance time: 10
    AIS State:Clear LOS State:Clear LOF State:Clear
    Version info Firmware: 20090113, FPGA: 20, spm_count = 0
    Framing is ESF, Line Code is B8ZS, Clock Source is Line.
    CRC Threshold is 320. Reported from firmware is 320.
    Data in current interval (89 seconds elapsed):
    0 Line Code Violations, 0 Path Code Violations
    0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
    T1 0/2/1 is down.
    Applique type is Channelized T1
    Cablelength is long gain36 0db
    Transmitter is sending remote alarm.
    Receiver has loss of signal.
    alarm-trigger is not set
    Soaking time: 3, Clearance time: 10
    AIS State:Clear LOS State:Failure LOF State:Failure
    Version info Firmware: 20090113, FPGA: 20, spm_count = 0
    Framing is ESF, Line Code is B8ZS, Clock Source is Line.
    CRC Threshold is 320. Reported from firmware is 320.
    Data in current interval (89 seconds elapsed):
    0 Line Code Violations, 0 Path Code Violations
    0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 89 Unavail Secs

    Router2#sh isdn status

    Global ISDN Switchtype = primary-ni
    ISDN Serial0/2/0:23 interface
    ******* Network side configuration *******
    dsl 0, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
    ACTIVE
    Layer 2 Status:
    TEI = 0, 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
    Number of L2 Discards = 0, L2 Session ID = 179
    Total Allocated ISDN CCBs = 0

    Router2#debug isdn q921
    *Mar 29 14:16:45.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:45.998: ISDN Se0/2/0:23 Q921: L2_EstablishDataLink: sending SABME
    *Mar 29 14:16:45.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:46.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:46.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:47.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:47.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:48.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:48.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:49.998: ISDN Se0/2/0:23 Q931: Ux_DLRelInd: DL_REL_IND received from L2
    *Mar 29 14:16:54.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:54.998: ISDN Se0/2/0:23 Q921: L2_EstablishDataLink: sending SABME
    *Mar 29 14:16:54.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:55.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:55.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:56.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:56.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:57.630: ISDN Se0/2/0:23 Q921: Net RX <- BAD FRAME(0x02017F)
    *Mar 29 14:16:57.998: ISDN Se0/2/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
    *Mar 29 14:16:58.998: ISDN Se0/2/0:23 Q931: Ux_DLRelInd: DL_REL_IND received from L2 ...........

    -----------------------------------------------------------------------------------------------------------------------
    I've never did it before. Am I missing some important thing ?
    If you have some useful information, let me know =) Thank you !
    - Pedro Alexandre
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  3. Senior Member
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    #2
    On R1 you seem to have L1 status deactivated. How are these connected?? Seems you might have a cabling issue maybe or a disabled interface?

    Router1#sh isdn status
    Load for five secs: 12%/7%; one minute: 12%; five minutes: 10%
    Time source is NTP, 10:27:14.030 GMT Wed Mar 29 2017

    Global ISDN Switchtype = primary-ni
    ISDN Serial0/3/0:23 interface
    ******* Network side configuration *******
    dsl 0, interface ISDN Switchtype = primary-ni
    Layer 1 Status:
    DEACTIVATED
    Layer 2 Status:
    TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED

    2017-2018 goals:
    [ ] CIPTV2 300-075
    [ ] SIP School SSCA
    [X] CCNP Switch 300-115 [ ] CCNP Route 300-101 [ ] CCNP Tshoot 300-135
    [ ] LPIC1-101 [ ] LPIC1-102 (wishful thinking)
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  4. Senior Member Kelkin's Avatar
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    CCNP,CCNP-Voice, CCDP,CCNA-Security, CCNA-Voice, CCNA, CCDA, Network+, Security+
    #3
    Its been forever since I did this but I believe one side has to be clock source line and also that your using a T1 crossover NOT an ethernet crossover.. different pins are crossed..
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  5. Senior Member
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    #4
    Indeed. ISDN PRI requires the blue/white-blue crossed with the orange/white-orange. BRI uses green/white-green instead of orange.
    2017-2018 goals:
    [ ] CIPTV2 300-075
    [ ] SIP School SSCA
    [X] CCNP Switch 300-115 [ ] CCNP Route 300-101 [ ] CCNP Tshoot 300-135
    [ ] LPIC1-101 [ ] LPIC1-102 (wishful thinking)
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  6. Senior Member pitviper's Avatar
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    #5
    the following command needs to be on one router only (typically the telco router):

    isdn protocol-emulate network

    Also as stated you need a T1 crossover cable (not a standard Ethernet crossover).

    Get a couple of network jacks and wire the x-over between them. Then you can just use standard patch cords in and out.
    Last edited by pitviper; 03-30-2017 at 07:43 PM.
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