Всем привет.
На магистральном канале в сети MPLS, на Multilink начали расти Late drop, причем так что волосы встают дыбом.

MPLS-ALMATY-P#sh int mu1
Multilink1 is up, line protocol is up
  Hardware is multilink group interface
  Description: ASTANA MULTILINK
  Internet address is XXXXXXXX/30
  MTU 1546 bytes, BW 3968 Kbit, DLY 100000 usec,
     reliability 255/255, txload 155/255, rxload 141/255
  Encapsulation PPP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 2 seconds on reset
  LCP Open, multilink Open
  Open: CDPCP, IPCP, MPLSCP
  Last input 00:00:01, output 00:00:01, output hang never
  Last clearing of "show interface" counters 2w0d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 491417
  Queueing strategy: Class-based queueing
  Output queue: 0/40 (size/max)
  30 second input rate 2208000 bits/sec, 965 packets/sec
  30 second output rate 2426000 bits/sec, 896 packets/sec
     503765752 packets input, 84110708750 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     499351962 packets output, 160604992311 bytes, 0 underruns
     491417 packets late drop, 232554588 bytes late drop
     0 output errors, 0 collisions, 16 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

MPLS-ALMATY-P#sh ver
Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVENTERPRISEK9-M), Version 12.2(33)SRB2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 10-Oct-07 22:42 by prod_rel_team

ROM: System Bootstrap, Version 12.2(33r)SRB4, RELEASE SOFTWARE (fc1)

MPLS-ALMATY-P uptime is 11 weeks, 5 days, 18 hours, 15 minutes
Uptime for this control processor is 11 weeks, 5 days, 18 hours, 14 minutes
Time since MPLS-ALMATY-P switched to active is 11 weeks, 5 days, 18 hours, 14 minutes
System returned to ROM by  power cycle (SP by power on)
System restarted at 15:29:07 ALMA Fri Jun 13 2008
System image file is "bootdisk:c7600rsp72043-adventerprisek9-mz.122-33.SRB2.bin"
Last reload type: Normal Reload

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

cisco CISCO7609-S (M8500) processor (revision 1.0) with 851968K/65536K bytes of memory.
Processor board ID FOX1138114X
CPU: MPC8548_E, Version: 2.0, (0x80390020)
CORE: E500, Version: 2.0, (0x80210020)
CPU:1200MHz, CCB:400MHz, DDR:200MHz,
L1:    D-cache 32 kB enabled
        I-cache 32 kB enabled

Last reset from power-on
1 Enhanced FlexWAN controller (8 Serial)(1 Channelized E3).
1 Virtual Ethernet interface
2 Gigabit Ethernet interfaces
17 Serial interfaces
1 Channelized E3 port
3964K bytes of non-volatile configuration memory.

500472K bytes of Internal ATA PCMCIA card (Sector size 512 bytes).
Configuration register is 0x2102

Погуглил, ничего не нашел на эту тему, в полисях все чисто, дропов в реалтайме нет, в BC тоже, но клиенты жалуются особенно у кого ВКС пользуют.
На самих интерфейсах картина следующая

Serial1/1/0/5:0 is up, line protocol is up
  Hardware is E3
  Description: ASTANA-2048-TTK
  MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,
     reliability 255/255, txload 153/255, rxload 124/255
  Encapsulation PPP, crc 16, loopback set
  Keepalive set (10 sec)
  LCP Open, multilink Open
  Last input 20:17:54, output 00:00:50, output hang never
  Last clearing of "show interface" counters 2w0d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 77
  Queueing strategy: Class-based queueing
  Output queue: 0/40 (size/max)
  5 minute input rate 970000 bits/sec, 443 packets/sec
  5 minute output rate 1197000 bits/sec, 410 packets/sec
     252027502 packets input, 42087768260 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 3 giants, 0 throttles
     428 input errors, 108 CRC, 0 frame, 0 overrun, 0 ignored, 317 abort
     249821468 packets output, 80343994727 bytes, 0 underruns
     0 output errors, 0 collisions, 7 interface resets
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions no alarm present
  Timeslot(s) Used:1-31, Transmitter delay is 0 flags

Serial1/1/0/6:0 is up, line protocol is up
  Hardware is E3
  Description: ASTANA-2048-TTK
  MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,
     reliability 255/255, txload 155/255, rxload 124/255
  Encapsulation PPP, crc 16, loopback set
  Keepalive set (10 sec)
  LCP Open, multilink Open
  Last input 20:18:25, output 00:01:19, output hang never
  Last clearing of "show interface" counters 2w0d
  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 971000 bits/sec, 457 packets/sec
  5 minute output rate 1212000 bits/sec, 414 packets/sec
     252044822 packets input, 42091193108 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     5 runts, 0 giants, 0 throttles
     137 input errors, 38 CRC, 0 frame, 0 overrun, 0 ignored, 94 abort
     249814778 packets output, 80347311184 bytes, 0 underruns
     0 output errors, 0 collisions, 8 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions no alarm present
  Timeslot(s) Used:1-31, Transmitter delay is 0 flags

Вот полиси на output

MPLS-ALMATY-P#sh policy-map interface multilink 1 output

Multilink1

  Service-policy output: set-MPLS-QOS-ASTANA

  Counters last updated 00:00:00 ago

    queue stats for all priority classes:
      
      queue limit 744 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 134213557/24105084688
      

    Class-map: MPLS-RealTime (match-all)
      134211928 packets, 23299302375 bytes
      30 second offered rate 558000 bps, drop rate 0 bps
      Match: mpls experimental topmost 5
      Priority: 75% (2976 kbps), burst bytes 74400

    Class-map: MPLS-BusinessCritical (match-all)
      100938782 packets, 21958082638 bytes
      30 second offered rate 342000 bps, drop rate 0 bps
      Match: mpls experimental topmost 3
      Queueing
      queue limit 198 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 100939881/22563959292
      
      bandwidth 20% (793 kbps)
        Exp-weight-constant: 16 (1/65536)
        Mean queue depth: 0 packets
        class       Transmitted      Random drop      Tail drop          Minimum        Maximum     Mark
                    pkts/bytes       pkts/bytes     pkts/bytes         thresh         thresh     prob
        
        0               0/0               0/0              0/0                 49            99  1/0
        1               0/0               0/0              0/0                 55            99  1/0
        2               0/0               0/0              0/0                 61            99  1/0
        3       100938760/22563482007      0/0              0/0                 67            99  1/10
        4               0/0               0/0              0/0                 73            99  1/0
        5               0/0               0/0              0/0                 79            99  1/0
        6               0/0               0/0              0/0                 85            99  1/0
        7               0/0               0/0              0/0                 91            99  1/0

    Class-map: MPLS-BestEffort (match-all)
      261643614 packets, 112461010500 bytes
      30 second offered rate 1749000 bps, drop rate 2000 bps
      Match: mpls experimental topmost 1
      Queueing
      queue limit 49 packets
      (queue depth/total drops/no-buffer drops) 1/491288/0
      (pkts output/bytes output) 261155944/113800071403
      
      bandwidth 5% (198 kbps)
        Exp-weight-constant: 1 (1/2)
        Mean queue depth: 0 packets
        class       Transmitted      Random drop      Tail drop          Minimum        Maximum     Mark
                    pkts/bytes       pkts/bytes     pkts/bytes         thresh         thresh     prob
        
        0               0/0               0/0              0/0                 12            24  1/0
        1       261154137/113799667172 196405/121039010   5374/2907707           13            24  1/10
        2               0/0               0/0              0/0                 15            24  1/0
        3               0/0               0/0              0/0                 16            24  1/0
        4               0/0               0/0              0/0                 18            24  1/0
        5               0/0               0/0              0/0                 19            24  1/0
        6               0/0               0/0              0/0                 21            24  1/0
        7               0/0               0/0              0/0                 22            24  1/0

          
    Class-map: class-default (match-any)
      3300852 packets, 210761598 bytes
      30 second offered rate 1000 bps, drop rate 0 bps
      Match: any
      
      queue limit 2 packets
      (queue depth/total drops/no-buffer drops) 0/192/0
      (pkts output/bytes output) 3322237/238888553
      

Может кто знает в чем траблы?