Reg:Low speed of the fibre link

[cisco.anubhav]

Hi,

A strange issue has risen as few fibre links connected from core using STM1 and of 2Mbpsare showing following output and there speed is very slow,kindly help me find out the issue and help resolving the issue.Output of one of the links is as given below,

CORE#sh int Se1/1/0.1/1/4/3:0
Serial1/1/0.1/1/4/3:0 is up, line protocol is up
  Hardware is SPA-1XCHSTM1/OC3
  Internet address is x.x.x.x/30
  MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
     reliability 255/255, txload 116/255, rxload 6/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:01, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 12055
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 56000 bits/sec, 64 packets/sec
  5 minute output rate 937000 bits/sec, 91 packets/sec
     1351190 packets input, 155951746 bytes, 0 no buffer
     Received 12974 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     751628 input errors, 94423 CRC, 54516 frame, 0 overrun, 0 ignored, 602689 abort
     1596894 packets output, 1478271189 bytes, 0 underruns
     0 output errors, 0 collisions, 11 interface resets
     0 output buffer failures, 0 output buffers swapped out
     9 carrier transitions no alarm present
  VC 11: timeslot(s): 1-31, Transmitter delay 0, non-inverted data

Thanks,

[vmiller]

Look at your interface counters. you have crcs, drops and aborts.

1. clear the counters on this interface & note the time you did so.

2. do a show interface at 15 minute intervals for one hour, then again 24 hours after the orginal clear counters.

    this will give you a measure of how bad things might be.

3. you need to then double check all the hardware from your router to the network point of presence clean connectors and verify light level.