Can someone please HELP

Discussion in 'Cisco' started by Igor Pinchevskiy, Aug 12, 2007.

  1. Hello,

    One of our remote offices started to have problems with the connection
    to our main office, where it runs very slow (we have a full point to
    point T1 line). I took a look at the interfaces and here is what I
    saw:

    Router A Main Office
    Serial0/0 is up, line protocol is up
    Hardware is PQUICC with Fractional T1 CSU/DSU
    Internet address is 192.168.1.110/24
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation PPP, loopback not set
    Keepalive set (10 sec)
    LCP Open
    Listen: CDPCP
    Open: IPCP
    Last input 00:00:28, output 00:00:10, output hang never
    Last clearing of "show interface" counters 3w5d
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    26
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/10 (size/max total/threshold/drops)
    Conversations 0/60/256 (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
    14555278 packets input, 1658156725 bytes, 0 no buffer
    Received 0 broadcasts, 0 runts, 44 giants, 0 throttles
    26735 input errors, 6419 CRC, 12411 frame, 0 overrun, 0 ignored,
    7905 abort
    17734346 packets output, 830466409 bytes, 0 underruns
    0 output errors, 0 collisions, 156 interface resets
    0 output buffer failures, 0 output buffers swapped out
    150 carrier transitions
    DCD=up DSR=up DTR=up RTS=up CTS=up

    Router B Remote Office
    Serial0/0/0 is up, line protocol is up
    Hardware is GT96K with integrated T1 CSU/DSU
    Internet address is 192.168.1.111/24
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation PPP, LCP Open
    Open: IPCP, loopback not set
    Keepalive set (10 sec)
    Last input 00:00:00, output 00:00:00, output hang never
    Last clearing of "show interface" counters 7w6d
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    120
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    Conversations 0/64/256 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 1158 kilobits/sec
    5 minute input rate 1000 bits/sec, 3 packets/sec
    5 minute output rate 3000 bits/sec, 4 packets/sec
    40097220 packets input, 3518808637 bytes, 0 no buffer
    Received 0 broadcasts, 6 runts, 173 giants, 0 throttles
    600835 input errors, 600833 CRC, 226525 frame, 66338 overrun, 0
    ignored, 319621 abort
    31092103 packets output, 3731205662 bytes, 0 underruns
    0 output errors, 0 collisions, 94 interface resets
    0 output buffer failures, 0 output buffers swapped out
    223 carrier transitions
    DCD=up DSR=up DTR=up RTS=up CTS=up

    I can't figure out from where are the errors coming, could this be the
    line itself? Any ideas, help, advice is greatly appreciated!

    Thank you in advance,

    Igor Pinchevskiy
     
    Igor Pinchevskiy, Aug 12, 2007
    #1
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  2. Igor Pinchevskiy

    J.Cottingim Guest

    On Aug 12, 4:25 pm, Igor Pinchevskiy <>
    wrote:
    > Hello,
    >
    > One of our remote offices started to have problems with the connection
    > to our main office, where it runs very slow (we have a full point to
    > point T1 line). I took a look at the interfaces and here is what I
    > saw:
    >
    > Router A Main Office
    > Serial0/0 is up, line protocol is up
    > Hardware is PQUICC with Fractional T1 CSU/DSU
    > Internet address is 192.168.1.110/24
    > MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation PPP, loopback not set
    > Keepalive set (10 sec)
    > LCP Open
    > Listen: CDPCP
    > Open: IPCP
    > Last input 00:00:28, output 00:00:10, output hang never
    > Last clearing of "show interface" counters 3w5d
    > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    > 26
    > Queueing strategy: weighted fair
    > Output queue: 0/1000/64/10 (size/max total/threshold/drops)
    > Conversations 0/60/256 (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
    > 14555278 packets input, 1658156725 bytes, 0 no buffer
    > Received 0 broadcasts, 0 runts, 44 giants, 0 throttles
    > 26735 input errors, 6419 CRC, 12411 frame, 0 overrun, 0 ignored,
    > 7905 abort
    > 17734346 packets output, 830466409 bytes, 0 underruns
    > 0 output errors, 0 collisions, 156 interface resets
    > 0 output buffer failures, 0 output buffers swapped out
    > 150 carrier transitions
    > DCD=up DSR=up DTR=up RTS=up CTS=up
    >
    > Router B Remote Office
    > Serial0/0/0 is up, line protocol is up
    > Hardware is GT96K with integrated T1 CSU/DSU
    > Internet address is 192.168.1.111/24
    > MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation PPP, LCP Open
    > Open: IPCP, loopback not set
    > Keepalive set (10 sec)
    > Last input 00:00:00, output 00:00:00, output hang never
    > Last clearing of "show interface" counters 7w6d
    > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    > 120
    > Queueing strategy: weighted fair
    > Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    > Conversations 0/64/256 (active/max active/max total)
    > Reserved Conversations 0/0 (allocated/max allocated)
    > Available Bandwidth 1158 kilobits/sec
    > 5 minute input rate 1000 bits/sec, 3 packets/sec
    > 5 minute output rate 3000 bits/sec, 4 packets/sec
    > 40097220 packets input, 3518808637 bytes, 0 no buffer
    > Received 0 broadcasts, 6 runts, 173 giants, 0 throttles
    > 600835 input errors, 600833 CRC, 226525 frame, 66338 overrun, 0
    > ignored, 319621 abort
    > 31092103 packets output, 3731205662 bytes, 0 underruns
    > 0 output errors, 0 collisions, 94 interface resets
    > 0 output buffer failures, 0 output buffers swapped out
    > 223 carrier transitions
    > DCD=up DSR=up DTR=up RTS=up CTS=up
    >
    > I can't figure out from where are the errors coming, could this be the
    > line itself? Any ideas, help, advice is greatly appreciated!
    >
    > Thank you in advance,
    >
    > Igor Pinchevskiy


    It's most definitely a line problem. You should call your service
    provide to have them check their line.
    Also, clear the counters on the interfaces so you can see how fast the
    errors are increasing.
    Another thing you can check is the cable that's used to extend the T1
    from where the LEC dropped it off to where the router is.
    If you have a controller interface in the router, check it for errors
    there - it can help the LEC determine the problem.
    Good luck
    -JC
     
    J.Cottingim, Aug 12, 2007
    #2
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  3. Thanks for the advice JC, how can I check the controller interface for
    errors?
     
    Igor Pinchevskiy, Aug 13, 2007
    #3
  4. I called AT&T (our service provider) they ran both intrusive and non
    intrusive tests and couldn't find anything, they're going to look at
    performance monitoring to see if anything shows up. Any other thigs
    that could be causing this besides a line issue?
     
    Igor Pinchevskiy, Aug 13, 2007
    #4
  5. Igor Pinchevskiy

    Guest

    On 13 Aug, 23:23, Igor Pinchevskiy <>
    wrote:
    > I called AT&T (our service provider) they ran both intrusive and non
    > intrusive tests and couldn't find anything, they're going to look at
    > performance monitoring to see if anything shows up. Any other thigs
    > that could be causing this besides a line issue?


    Serial0/0 is up, line protocol is up
    Hardware is PQUICC with Fractional T1 CSU/DSU
    Internet address is 192.168.1.110/24
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation PPP, loopback not set

    Last clearing of "show interface" counters 3w5d

    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    26
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/10 (size/max total/threshold/drops)
    Available Bandwidth 1158 kilobits/sec

    14555278 packets input, 1658156725 bytes, 0 no buffer
    26735 input errors, 6419 CRC, 12411 frame,
    0 overrun, 0 ignored, 7905 abort

    0 output errors, 0 collisions, 156 interface resets
    150 carrier transitions



    Router B Remote Office
    Serial0/0/0 is up, line protocol is up
    Hardware is GT96K with integrated T1 CSU/DSU

    Last clearing of "show interface" counters 7w6d
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    120

    40097220 packets input, 3518808637 bytes, 0 no buffer

    600835 input errors, 600833 CRC, 226525 frame,
    66338 overrun, 0 ignored, 319621 abort
    !!<-- this is about 1/80 bad packets. This is terrible.

    0 output errors, 0 collisions, 94 interface resets

    223 carrier transitions
    !! the interfce has gone down 233 times.


    These counters do show hardware problems on the link,
    at least over the period monitored.

    I suggest that you clear them to remove historic data.


    sh controllers t1 0/0/0 [0/0]

    Will show more detailed statistics.
    You get 15 minute intervals for he last 24 hours and
    a summary at the end.

    Look at sh log - correct logging configuraton required.

    Cisco have some good documents on T1 troubleshooting.
    SEarch for [t1 troubleshooting] and you should get something.

    When Telcos test links they often miss out the last bit.
    They remotely command their "smart-jack" to loop
    and then tell you that everyting is good. If the smart-jack
    is faulty or your cable is faulty then their remote
    test will show everyting is ok.

    If you like post

    sh controllers t1 x/x[/x]
    sh log

    To test the line yourself you can do pings.
    ping with big packets and do quite a lot of them.

    hr#ping
    Protocol [ip]:
    Target IP address: 10.99.37.130
    Repeat count [5]: 100
    Datagram size [100]: 1400 !<-- 1400 is good - avoids tricky MTU
    Timeout in seconds [2]:
    Extended commands [n]:
    Sweep range of sizes [n]:
    Type escape sequence to abort.
    Sending 100, 1400-byte ICMP Echos to 10.99.37.130, timeout is 2
    seconds:
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Success rate is 100 percent (100/100), round-trip min/avg/max =
    12/15/20 ms
    hr#

    Use MORE than 100. e.g 10000. whatever. NOTE that this
    test may dissrupt normal network traffic. take care.

    If you are dropping more than 1 in 1000 (much less is usual) then
    you must fix it.

    Many t1 links will run completely clean for months with zero errors.
    This is what you should aim for.

    Post the data and someone will I am sure have a look.
     
    , Aug 14, 2007
    #5
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