HELP! Multilink PPP w/3 T1s and a seperate 4th T1

Discussion in 'Cisco' started by rajuliano@gmail.com, Aug 28, 2006.

  1. Guest

    I've got a Cisco 3640 with 128M/32M RAM. There are 2x NM-2FE2W and 4x
    WIC-1DSU-T1 cards installed. The configurations for the interfaces are
    below. I have 4 point-to-point T1s coming into this router. 3 T1s are
    coming from another 3640 at one office (A) and the other T1 is coming
    from a 2514 at another office (B). I control all 3 routers.

    I've been using Multilink PPP to give my users a 3M pipe over 2 of the
    T1s at office A. I had a 3rd T1 installed in order to bump it up to
    4.5M. Office B is serviced by a the single (fourth) T1.

    Before the new T1 was installed everything worked fine (2 T1s using
    MLPPP to office A and 1 T1 to office B). Now, with all 4 lines running,
    the 3rd MLPPP line won't work (see 'sho int' and 'sho service-module'
    below) but the original 3 lines work fine.

    Now here's where it gets strange. If I remove the card servicing the T1
    to office B and boot up the router, all 3 interfaces come up and MLPPP
    works great, providing a 4.5M pipe. Once I shut down the router and
    reinsert the card for office B, the 3rd MLPPP lines goes down again. I
    tried swapping the office B card/cable with the card(s)/cable(s) from
    the 1st and 2nd MLPPP lines and get the exact same results. Same goes
    for the card/cable servicing the 3rd MLPPP line.

    Am I missing a configuration step? I'm at a loss.

    Again, I've swapped WIC cards, NM cards, and cables between all
    interfaces and they all work. I've also tried different slots for the
    NMs. No difference.

    Help! TIA

    Rich

    _____________________________

    interface Multilink1
    ip address A.B.C.D 255.255.255.252
    ip route-cache flow
    fair-queue 64 16 0
    no cdp enable
    ppp multilink
    ppp multilink fragment delay 10
    ppp multilink interleave
    ppp multilink group 1
    !
    interface MFR1
    no ip address
    !
    interface FastEthernet0/0
    ip address E.F.G.H 255.255.255.240
    ip route-cache flow
    speed 100
    full-duplex
    !
    interface Serial0/0
    bandwidth 1536
    no ip address
    encapsulation ppp
    fair-queue
    ppp multilink
    ppp multilink group 1
    !
    interface FastEthernet0/1
    ip address I.J.K.L 255.255.255.224
    speed 100
    full-duplex
    !
    interface Serial0/1
    bandwidth 1536
    no ip address
    encapsulation ppp
    fair-queue
    ppp multilink
    ppp multilink group 1
    !
    interface FastEthernet1/0
    no ip address
    speed 100
    full-duplex
    !
    interface Serial1/0
    bandwidth 1536
    no ip address
    encapsulation ppp
    fair-queue
    ppp multilink
    ppp multilink group 1
    !
    interface FastEthernet1/1
    ip address M.N.O.P 255.255.255.252 secondary
    ip address Q.R.S.T 255.255.255.128 secondary
    ip address U.V.W.X 255.255.255.248
    speed 100
    full-duplex
    !
    interface Serial1/1
    ip address Y.Z.A.B 255.255.255.252
    no ip mroute-cache
    autodetect encapsulation ppp

    --------------------------------------------------------------------------------
    [with all four lines connected]

    abc-rtr0#sho int ser 1/0
    Serial1/0 is down, line protocol is down
    Hardware is DSCC4 with integrated T1 CSU/DSU
    MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation PPP, LCP Closed, multilink Closed, loopback not set
    Keepalive set (10 sec)
    Last input never, output 00:29:20, output hang never
    Last clearing of "show interface" counters 05:03:07
    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 1152 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
    1640 packets output, 47560 bytes, 0 underruns
    0 output errors, 0 collisions, 166 interface resets
    0 output buffer failures, 0 output buffers swapped out
    2 carrier transitions
    DCD=down DSR=up DTR=up RTS=up CTS=down

    abc-rtr0#sho service-mod ser 1/0
    Module type is T1/fractional
    Hardware revision is 0.96, Software revision is 20050811-0.3,
    Image checksum is 0x80ACD1B3, Protocol revision is 0.1
    Receiver has Remote alarm,
    Framing is ESF, Line Code is B8ZS, Current clock source is line,
    Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536
    Kbits/sec.
    Last module self-test (done at startup): Passed
    Last clearing of alarm counters 05:03:26
    loss of signal : 0,
    loss of frame : 0,
    AIS alarm : 0,
    Remote alarm : 2, current duration 00:29:19
    Module access errors : 0,
    Total Data (last 20 15 minute intervals):
    6742 Line Code Violations, 466 Path Code Violations
    0 Slip Secs, 25 Fr Loss Secs, 3 Line Err Secs, 0 Degraded Mins
    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 25 Unavail
    Secs
    Data in current interval (173 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

    abc-rtr0#sho int multi 1
    Multilink1 is up, line protocol is up
    Hardware is multilink group interface
    Internet address is 64.70.70.253/30
    MTU 1500 bytes, BW 3072 Kbit, DLY 100000 usec,
    reliability 255/255, txload 21/255, rxload 31/255
    Encapsulation PPP, LCP Open, multilink Open
    Open: IPCP, loopback not set
    Keepalive set (10 sec)
    DTR is pulsed for 2 seconds on reset
    Last input 00:00:00, output never, output hang never
    Last clearing of "show interface" counters 05:04:08
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    62
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/62/26293 (size/max
    total/threshold/drops/interleaves)
    Conversations 0/16/16 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 2304 kilobits/sec
    5 minute input rate 384000 bits/sec, 266 packets/sec
    5 minute output rate 256000 bits/sec, 244 packets/sec
    4997912 packets input, 924185971 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
    4675985 packets output, 695093405 bytes, 0 underruns
    0 output errors, 0 collisions, 2 interface resets
    0 output buffer failures, 0 output buffers swapped out
    0 carrier transitions
    , Aug 28, 2006
    #1
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  2. Guest

    Anyone?
    , Aug 29, 2006
    #2
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  3. Thrill5 Guest

    <> wrote in message
    news:...
    > I've got a Cisco 3640 with 128M/32M RAM. There are 2x NM-2FE2W and 4x
    > WIC-1DSU-T1 cards installed. The configurations for the interfaces are
    > below. I have 4 point-to-point T1s coming into this router. 3 T1s are
    > coming from another 3640 at one office (A) and the other T1 is coming
    > from a 2514 at another office (B). I control all 3 routers.
    >
    > I've been using Multilink PPP to give my users a 3M pipe over 2 of the
    > T1s at office A. I had a 3rd T1 installed in order to bump it up to
    > 4.5M. Office B is serviced by a the single (fourth) T1.
    >
    > Before the new T1 was installed everything worked fine (2 T1s using
    > MLPPP to office A and 1 T1 to office B). Now, with all 4 lines running,
    > the 3rd MLPPP line won't work (see 'sho int' and 'sho service-module'
    > below) but the original 3 lines work fine.
    >
    > Now here's where it gets strange. If I remove the card servicing the T1
    > to office B and boot up the router, all 3 interfaces come up and MLPPP
    > works great, providing a 4.5M pipe. Once I shut down the router and
    > reinsert the card for office B, the 3rd MLPPP lines goes down again. I
    > tried swapping the office B card/cable with the card(s)/cable(s) from
    > the 1st and 2nd MLPPP lines and get the exact same results. Same goes
    > for the card/cable servicing the 3rd MLPPP line.
    >
    > Am I missing a configuration step? I'm at a loss.
    >
    > Again, I've swapped WIC cards, NM cards, and cables between all
    > interfaces and they all work. I've also tried different slots for the
    > NMs. No difference.
    >
    > Help! TIA
    >
    > Rich
    >
    > _____________________________
    >
    > interface Multilink1
    > ip address A.B.C.D 255.255.255.252
    > ip route-cache flow
    > fair-queue 64 16 0
    > no cdp enable
    > ppp multilink
    > ppp multilink fragment delay 10
    > ppp multilink interleave
    > ppp multilink group 1
    > !
    > interface MFR1
    > no ip address
    > !
    > interface FastEthernet0/0
    > ip address E.F.G.H 255.255.255.240
    > ip route-cache flow
    > speed 100
    > full-duplex
    > !
    > interface Serial0/0
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    > !
    > interface FastEthernet0/1
    > ip address I.J.K.L 255.255.255.224
    > speed 100
    > full-duplex
    > !
    > interface Serial0/1
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    > !
    > interface FastEthernet1/0
    > no ip address
    > speed 100
    > full-duplex
    > !
    > interface Serial1/0
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    > !
    > interface FastEthernet1/1
    > ip address M.N.O.P 255.255.255.252 secondary
    > ip address Q.R.S.T 255.255.255.128 secondary
    > ip address U.V.W.X 255.255.255.248
    > speed 100
    > full-duplex
    > !
    > interface Serial1/1
    > ip address Y.Z.A.B 255.255.255.252
    > no ip mroute-cache
    > autodetect encapsulation ppp
    >
    > --------------------------------------------------------------------------------
    > [with all four lines connected]
    >
    > abc-rtr0#sho int ser 1/0
    > Serial1/0 is down, line protocol is down
    > Hardware is DSCC4 with integrated T1 CSU/DSU
    > MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation PPP, LCP Closed, multilink Closed, loopback not set
    > Keepalive set (10 sec)
    > Last input never, output 00:29:20, output hang never
    > Last clearing of "show interface" counters 05:03:07
    > 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 1152 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
    > 1640 packets output, 47560 bytes, 0 underruns
    > 0 output errors, 0 collisions, 166 interface resets
    > 0 output buffer failures, 0 output buffers swapped out
    > 2 carrier transitions
    > DCD=down DSR=up DTR=up RTS=up CTS=down
    >
    > abc-rtr0#sho service-mod ser 1/0
    > Module type is T1/fractional
    > Hardware revision is 0.96, Software revision is 20050811-0.3,
    > Image checksum is 0x80ACD1B3, Protocol revision is 0.1
    > Receiver has Remote alarm,
    > Framing is ESF, Line Code is B8ZS, Current clock source is line,
    > Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536
    > Kbits/sec.
    > Last module self-test (done at startup): Passed
    > Last clearing of alarm counters 05:03:26
    > loss of signal : 0,
    > loss of frame : 0,
    > AIS alarm : 0,
    > Remote alarm : 2, current duration 00:29:19
    > Module access errors : 0,
    > Total Data (last 20 15 minute intervals):
    > 6742 Line Code Violations, 466 Path Code Violations
    > 0 Slip Secs, 25 Fr Loss Secs, 3 Line Err Secs, 0 Degraded Mins
    > 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 25 Unavail
    > Secs
    > Data in current interval (173 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
    >
    > abc-rtr0#sho int multi 1
    > Multilink1 is up, line protocol is up
    > Hardware is multilink group interface
    > Internet address is 64.70.70.253/30
    > MTU 1500 bytes, BW 3072 Kbit, DLY 100000 usec,
    > reliability 255/255, txload 21/255, rxload 31/255
    > Encapsulation PPP, LCP Open, multilink Open
    > Open: IPCP, loopback not set
    > Keepalive set (10 sec)
    > DTR is pulsed for 2 seconds on reset
    > Last input 00:00:00, output never, output hang never
    > Last clearing of "show interface" counters 05:04:08
    > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
    > 62
    > Queueing strategy: weighted fair
    > Output queue: 0/1000/64/62/26293 (size/max
    > total/threshold/drops/interleaves)
    > Conversations 0/16/16 (active/max active/max total)
    > Reserved Conversations 0/0 (allocated/max allocated)
    > Available Bandwidth 2304 kilobits/sec
    > 5 minute input rate 384000 bits/sec, 266 packets/sec
    > 5 minute output rate 256000 bits/sec, 244 packets/sec
    > 4997912 packets input, 924185971 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
    > 4675985 packets output, 695093405 bytes, 0 underruns
    > 0 output errors, 0 collisions, 2 interface resets
    > 0 output buffer failures, 0 output buffers swapped out
    > 0 carrier transitions
    >


    Could be a bad chassis. Have you tried swapping the router with another
    one? Could also be an IOS bug, what version are you running?

    Scott
    Thrill5, Aug 29, 2006
    #3
  4. brink Guest

    Don't see a clear reason why it wouldn't work, but you might check I/O
    memory is sufficient for 4 active. And please give us a show controller
    for the non-working interface, that could give a bit more detail on why
    it won't come up.
    brink, Aug 29, 2006
    #4
  5. Guest

    brink wrote:
    > Don't see a clear reason why it wouldn't work, but you might check I/O
    > memory is sufficient for 4 active. And please give us a show controller
    > for the non-working interface, that could give a bit more detail on why
    > it won't come up.


    Sounds like you have been very thorough.

    Is logging enabled? What are you seeing there?
    Memory allocation failures would be logged.

    conf t
    logg buff 50000
    logg buff deb
    end
    wr

    reload
    sh log

    temp#sh mem
    Head Total(b) Used(b) Free(b) Lowest(b)
    Largest(b)
    Processor 81BA60F4 31406860 15146932 16259928 16044380
    15376912
    I/O 3999C00 6710272 1073388 5636884 5576744
    5636308

    The most critical value is the "largest".

    Along with the sh controllers then post

    sh log
    sh mem ! first few lines
    sh buff

    sh network-clocks ! may not apply to this platform.
    , Aug 29, 2006
    #5
  6. Hansang Bae Guest

    wrote:
    [snip: trying to do this:

    Please view in a fixed-width font such as Courier.

    +----------+
    | Site A |
    | |
    +-+-+-+----+
    | | |
    | | |
    | | | Qty 3 T1 in MLPPP
    | | |
    | | |
    ++-+-+---+ +--------+
    | | | |
    | HQ | Qty 1 T1 | |
    | +------------------| Site B |
    | | | |
    +--------+ +--------+

    > Now here's where it gets strange. If I remove the card servicing the
    > T1 to office B and boot up the router, all 3 interfaces come up and
    > MLPPP works great, providing a 4.5M pipe. Once I shut down the router
    > and reinsert the card for office B, the 3rd MLPPP lines goes down
    > again. I tried swapping the office B card/cable with the
    > card(s)/cable(s) from the 1st and 2nd MLPPP lines and get the exact
    > same results. Same goes for the card/cable servicing the 3rd MLPPP
    > line.
    >
    > Am I missing a configuration step? I'm at a loss.
    >
    > Again, I've swapped WIC cards, NM cards, and cables between all
    > interfaces and they all work. I've also tried different slots for the
    > NMs. No difference.
    >
    > Help! TIA
    >
    > Rich
    >
    > _____________________________
    >
    > interface Multilink1
    > ip address A.B.C.D 255.255.255.252
    > ip route-cache flow
    > fair-queue 64 16 0
    > no cdp enable
    > ppp multilink
    > ppp multilink fragment delay 10
    > ppp multilink interleave
    > ppp multilink group 1
    > !
    > interface MFR1
    > no ip address
    > !
    > interface Serial0/0
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    >
    > interface Serial0/1
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    > !
    > interface Serial1/0
    > bandwidth 1536
    > no ip address
    > encapsulation ppp
    > fair-queue
    > ppp multilink
    > ppp multilink group 1
    > !
    > interface Serial1/1
    > ip address Y.Z.A.B 255.255.255.252
    > no ip mroute-cache
    > autodetect encapsulation ppp
    >
    > ----------------------------------------------------------------------
    > ---------- [with all four lines connected]
    >
    > abc-rtr0#sho int ser 1/0
    > Serial1/0 is down, line protocol is down
    > Hardware is DSCC4 with integrated T1 CSU/DSU
    > MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation PPP, LCP Closed, multilink Closed, loopback not set
    > Keepalive set (10 sec)
    > Last input never, output 00:29:20, output hang never
    > DCD=down DSR=up DTR=up RTS=up CTS=down
    >
    > abc-rtr0#sho service-mod ser 1/0
    > Module type is T1/fractional
    > Hardware revision is 0.96, Software revision is 20050811-0.3,
    > Image checksum is 0x80ACD1B3, Protocol revision is 0.1
    > Receiver has Remote alarm,
    > Framing is ESF, Line Code is B8ZS, Current clock source is line,
    > Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536



    [snip]

    You are getting a remote alarm. Is the other side Site-A configured
    properly? (I realize it works when T1 to B is not connected, but worth
    checking again)

    the other thing to consider is that you may have reached a limit. but
    then why would you get a remote-alarm.... Interesting.

    I would investigate the remote alarm first. Make sure there is no loop
    on the other end for example that's getting thrown up for some reason.
    you can try to detect the loopback with 'down-when-loop'

    --

    hsb


    "Somehow I imagined this experience would be more rewarding" Calvin
    **************************ROT13 MY ADDRESS*************************
    Due to the volume of email that I receive, I may not be able to
    reply to emails sent to my account. Please post a followup instead.
    ********************************************************************
    Hansang Bae, Aug 30, 2006
    #6
  7. Hansang Bae Guest

    wrote:
    [snip]
    > Before the new T1 was installed everything worked fine (2 T1s using
    > MLPPP to office A and 1 T1 to office B). Now, with all 4 lines
    > running, the 3rd MLPPP line won't work (see 'sho int' and 'sho
    > service-module' below) but the original 3 lines work fine.
    >
    > Now here's where it gets strange. If I remove the card servicing the
    > T1 to office B and boot up the router, all 3 interfaces come up and
    > MLPPP works great, providing a 4.5M pipe. Once I shut down the router
    > and reinsert the card for office B, the 3rd MLPPP lines goes down
    > again. I tried swapping the office B card/cable with the
    > card(s)/cable(s) from the 1st and 2nd MLPPP lines and get the exact
    > same results. Same goes for the card/cable servicing the 3rd MLPPP
    > line.
    >


    One other thing to consider. Clock source on the T1's. Perhaps you
    are at just at the edge of clock drift and adding the one additional T1
    is killing it?



    See Thrill5's post (quoted here: All voice circuits (i.e. a T1) need a
    clock, but clock is a misnomer for what is really needed, which is a
    stable oscillator, or a common source for recovering the "clock" of the
    circuit. Circuits from the SAME carrier can generally share a clock
    because the carrier will generally have a single "clock source" for all
    their circuits. If you have 3 T1 from the same carrier, on one of the
    T1's you would configure "clock source primary" and the rest could be
    "clock source internal", because the internal clock would be synced to
    the "primary" line. You can also configure each interface as "clock
    source line" which is the default. All T1's need a clock source,
    either your end or their end, and if this is a carrier circuit, than
    they provide the clock and you need either "clock source line" or
    "clock source primary" on one T1, and "clock source internal" on the
    others. The only time you would provide clock by NOT configuring
    "clock source line" or "clock source primary" is if you were connecting
    a to a PBX and it was configure to recover clock for that circuit on
    that T1, or you were running a T1 over your own copper to another
    device. Since you have the errors described above, you do a clocking
    issue, and they should be configured as "clock source line".)

    --

    hsb


    "Somehow I imagined this experience would be more rewarding" Calvin
    **************************ROT13 MY ADDRESS*************************
    Due to the volume of email that I receive, I may not be able to
    reply to emails sent to my account. Please post a followup instead.
    ********************************************************************
    Hansang Bae, Aug 30, 2006
    #7
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