Multilink Errors - Input, Frame, and Overrun

Unanswered Question
Apr 18th, 2011

We have 2 T1's bundled in Mu1. The Mu1 interface is showing input, frame, and overrun errors, however the serial interfaces do not show any errors. I know there is a bug out there there that is close, however this is supposed to be fixed in our version of IOS (12.4(20)T6 and does not mention overrun errors. Users at the site are complaning of slow network connectvity, however I am not sure if this is related at this time. Would appreciate any assistance. See the output below, these commands were run approximately 15 min. after a show

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#show interfaces serial 0/0/0:1
Serial0/0/0:1 is up, line protocol is up
  Hardware is GT96K Serial
  Description: interface 1
  MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 4/255, rxload 26/255
  Encapsulation PPP, LCP Open, multilink Open
  Link is a member of Multilink bundle Multilink1, 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 00:33:56
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 158000 bits/sec, 40 packets/sec
  30 second output rate 30000 bits/sec, 37 packets/sec
     145959 packets input, 75329012 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
     146651 packets output, 13751092 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags

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#show interfaces serial 0/0/1:1
Serial0/0/1:1 is up, line protocol is up
  Hardware is GT96K Serial
  Description: interface 2
  MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 5/255, rxload 68/255
  Encapsulation PPP, LCP Open, multilink Open
  Link is a member of Multilink bundle Multilink1, 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 00:34:14
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 432000 bits/sec, 70 packets/sec
  5 minute output rate 34000 bits/sec, 53 packets/sec
     163634 packets input, 97245035 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
     148335 packets output, 13962620 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Timeslot(s) Used:1-24, SCC: 1, Transmitter delay is 0 flags

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mtcsc-rtr#show interfaces multilink 1
Multilink1 is up, line protocol is up
  Hardware is multilink group interface
  Description: mu1
  Internet address is 162.9.254.50/30
  MTU 1500 bytes, BW 3088 Kbit/sec, DLY 100000 usec,
     reliability 240/255, txload 10/255, rxload 123/255
  Encapsulation PPP, LCP Open, multilink Open
  Open: IPCP, CDPCP, 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 00:34:44
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 1499000 bits/sec, 179 packets/sec
  30 second output rate 123000 bits/sec, 158 packets/sec
     309271 packets input, 168770263 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     14093 input errors, 0 CRC, 8388 frame, 5705 overrun, 0 ignored, 0 abort
     301639 packets output, 28394340 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

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#show ppp multilink

Multilink1
  Bundle name: mactr-rtr-1
  Remote Endpoint Discriminator: [1] xxxxx
  Local Endpoint Discriminator: [1] xxxxx
  Bundle up for 15w6d, total bandwidth 3088, load 7/255
  Receive buffer limit 24000 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    5792 lost fragments, 84537 reordered
    8528/11521793 discarded fragments/bytes, 8528 lost received
    0xDB80FD received sequence, 0x51757 sent sequence
  Member links: 2 active, 0 inactive (max not set, min not set)
    Se0/0/0:1, since 15w5d
    Se0/0/1:1, since 7w1d
No inactive multilink interfaces

I have this problem too.
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Posted April 18, 2011 at 10:52 AM
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