HDLC invalid serial type code message

Discussion in 'Cisco' started by randy.smith@novatechsol.com, May 11, 2005.

  1. Guest

    I'm trying to connect a WIC-1T on 3660 (IOS 12.1) to a WIC-1T on a 2811
    (IOS 12.3) via a fraction of a T-1. Our interal telco guys are using
    some MCK multiplexers to peel off 8 channels for voice and giving me
    the rest for data (using V.35 connections to the WICs) so we should
    have a data rate of 1024000.

    On the 2811, I get this:

    Serial0/0/0 is up, line protocol is down
    Hardware is GT96K Serial
    Description: WAN connection to main building
    Internet address is 192.168.3.1/24
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation HDLC, loopback not set
    Keepalive set (10 sec)
    Last input never, output 00:00:05, output hang never
    Last clearing of "show interface" counters never
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    Conversations 0/1/256 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 1158 kilobits/sec
    5 minute input rate 0 bits/sec, 0 packets/sec
    5 minute output rate 0 bits/sec, 0 packets/sec
    0 packets input, 0 bytes, 0 no buffer
    Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
    93 packets output, 5613 bytes, 0 underruns
    0 output errors, 0 collisions, 21 interface resets
    0 output buffer failures, 0 output buffers swapped out
    0 carrier transitions
    DCD=up DSR=up DTR=up RTS=up CTS=up

    And in debug, I get this:

    *May 9 16:09:14.967: Serial0/0/0: attempting to restart
    *May 9 16:09:14.967: gt96k_mbrd_serial_mode_reg_init:: was DTE, now
    set to DTE
    *May 9 16:09:14.967: DTE idb->dte_interface = DTE
    *May 9 16:09:14.967: Dscc4(0/0): DCD is up.
    *May 9 16:09:23.967: Serial0/0/0: HDLC myseq 51, mineseen 0, yourseen
    0, line down
    *May 9 16:09:33.967: Serial0/0/0: HDLC myseq 52, mineseen 0, yourseen
    0, line down
    *May 9 16:09:43.967: Serial0/0/0: HDLC myseq 53, mineseen 0, yourseen
    0, line down
    *May 9 16:09:44.967: Serial0/0/0: attempting to restart

    On the 3660, I see this:

    Serial2/0 is up, line protocol is down
    Hardware is DSCC4 Serial
    Internet address is 192.168.3.2/24
    MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation HDLC, loopback not set
    Keepalive set (10 sec)
    Last input 00:00:01, output 00:00:06, output hang never
    Last clearing of "show interface" counters 00:01:46
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    Conversations 0/1/256 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 1536 kilobits/sec
    5 minute input rate 0 bits/sec, 0 packets/sec
    5 minute output rate 0 bits/sec, 0 packets/sec
    51 packets input, 1122 bytes, 0 no buffer
    Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
    10 packets output, 240 bytes, 0 underruns
    0 output errors, 0 collisions, 4 interface resets
    0 output buffer failures, 0 output buffers swapped out
    0 carrier transitions
    DCD=up DSR=up DTR=up RTS=up CTS=up

    And in debug, get this output:

    6d05h: Serial2/0: attempting to restart
    6d05h: Illegal HDLC serial type code 2609, PC=0x6001C3EC
    6d05h: Illegal HDLC serial type code 2609, PC=0x6001C3EC
    6d05h: Illegal HDLC serial type code 2609, PC=0x6001C3EC
    6d05h: Illegal HDLC serial type code 2609, PC=0x6001C3EC
    6d05h: Illegal HDLC serial type code 2609, PC=0x6001C3EC
    6d05h: Serial2/0: HDLC myseq 21, mineseen 0, yourseen 0, line down

    I thought that on a V.35 interface, the router will set its rate
    automatically based upon the clocking it sees coming from the DSU/CSU.
    The available bandwidth on the 2811 sh interface command looks
    reasonable, but the 3660 is clearly too high. This connection was
    working until the telco guys started messing with the clocking. From
    what they are saying, it sounds like the MCK mux by the 2811 is
    generating clocking, but I am wondering if that is not coming across
    correctly at the 3660 end. Thoughts?

    --Randy--
     
    , May 11, 2005
    #1
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  2. Guest

    I'll answer my own question just in case someone else runs into this.
    Ended up the problem was with the T-1. Our telco installed a 2-wire T-1
    instead of a 4-wire and that apparently was the source of the problem.
    Once they switched us to a 4-wire T-1, everything worked fine.
     
    , May 20, 2005
    #2
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