Input errors and slowdown

[MDuckett1]

Hi all,

Hope someone can help, over the past few weeks one of switches (3500xl) has started showing a large number of input errors on the uplink interface(shown below) and the users connected experience a great deal of slow down.  I've checked all the phsical connections and can't see a problem and port mirroring doesnt show me too much (although Im not really a network guy so I could be missing something..)

Interface Output:

MAI-SW41#sh int gig0/1
GigabitEthernet0/1 is up, line protocol is up
  Hardware is Gigabit Ethernet, address is 0002.b98f.90f1 (bia 0002.b98f.90f1)
  Description: Uplink MAI-SW01
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex (Full), 1000Mb/s, media type is SX
  output flow-control is off, input flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 20:28:53
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 692000 bits/sec, 130 packets/sec
  5 minute output rate 392000 bits/sec, 105 packets/sec
     11771432 packets input, 3219529600 bytes, 0 no buffer
     Received 1761184 broadcasts, 0 runts, 0 giants, 0 throttles
     32519 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1656571 multicast, 0 pause input
     8413972 packets output, 1785575097 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

Controller output:

  Transmit                           Receive

731682836 Bytes                  2410818600 Bytes

   3141487 Unicast frames            3592201 Unicast frames

      3128 Multicast frames           181944 Multicast frames

      2228 Broadcast frames            20086 Broadcast frames

         0 Discarded frames                0 No bandwidth frames

         0 Too old frames                  0 No buffers frames

         0 Deferred frames              1648 No dest, unicast

         0  1 collision frames        102514 No dest, multicast

         0  2 collision frames          1729 No dest, broadcast

         0  3 collision frames             0 Alignment errors

         0  4 collision frames             0 FCS errors

         0  5 collision frames            44 Collision fragments

         0  6 collision frames

         0  7 collision frames             0 Undersize frames

         0  8 collision frames        221018 Minimum size frames

         0  9 collision frames       1964824 65 to 127 byte frames

         0 10 collision frames        130397 128 to 255 byte frames

         0 11 collision frames         47975 256 to 511 byte frames

         0 12 collision frames         48491 512 to 1023 byte frames

         0 13 collision frames       1497444 1024 to 1518 byte frames

         0 14 collision frames             0 Oversize frames

         0 15 collision frames         30295 Flooded frames

         0 Excessive collisions            0 Overrun frames

         0 Late collisions                 0 VLAN filtered frames

         0 Good (1 coll) frames            1 Source routed frames

         0 Good(>1 coll) frames            0 Valid oversize frames

         0 Pause frames                    0 Pause frames

         0 VLAN discard frames         10027 Symbol error frames

         0 Excess defer frames            38 Invalid frames, too large

         0 Too large frames                0 Valid frames, too large

    766484 64 byte frames                  6 Invalid frames, too small

    307326 127 byte frames                 0 Valid frames, too small

   1701857 255 byte frames               767  0 Addr Cmp frames

     75802 511 byte frames            314941  1 Addr Cmp frames

     66319 1023 byte frames          3594478  2 Addr Cmp frames

    229055 1518 byte frames                0  3 Addr Cmp frames

                                           0  4 Addr Cmp frames

                                           0  5 Addr Cmp frames

                                           0  6 Addr Cmp frames

                                           0  7 Addr Cmp frames

                                           0  8 Addr Cmp frames

                                           0  9 Addr Cmp frames

                                           0 10 Addr Cmp frames

                                           0 11 Addr Cmp frames

                                           0 12 Addr Cmp frames

                                           0 13 Addr Cmp frames

                                           0 14 Addr Cmp frames

                                           0 15 Addr Cmp frames

All counters were cleared first thing this morning.

Please let me know if I need to provide more info, have to confess Im a little lost on this one!

[johnlloyd_13]

Hi Mike,

Try to hardcode same speed and duplex on both ends of your switches. Was there any duplex mismatch in syslog?

Sent from Cisco Technical Support iPhone App

[smogra · Accepted solution]

Input errors are generally because of layer 1 issues, mostly bad media (cable/gbics). 
Check for the cable or GBICs on both the ends. 

Hope thet helps.

Sweta

p.s. please rate the helpful answers.

[Leo Laohoo · Accepted solution]

10027 Symbol error frames

That's too high.

[Somasundaram Jayaraman]

I can see from the output that the media type used is SX. It could be possible that either the port, SFP, cable having  issue.

have you tried changing the cable, SFP and the port.

In order to isolate the issue, enable UDLD on that interface and check whether the interface is going error-disabled or not.

To enable udld globally:

=================

config t

udld enable

To enable in interface level:

===================

conf ter

inter gig 0/1

udld mode aggressive.

check this link for more details

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_40_se/configuration/guide/swudld.pdf

Hope this helps

[Leo Laohoo · Accepted solution]

In order to isolate the issue, enable UDLD on that interface and check whether the interface is going error-disabled or not.

I don't believe UDLD is supported on 3500XL.

[MDuckett1]

Hi All,

Thanks for the replies I am going to look into your suggestions today (sadly being a production switch it is difficult to work on in hours despite the problems).

johnlloyd_13 - No there are no duplex mismatches in the syslog (or any messages related to this interface)

I am going to check all the physical media again later. I'll report back and rate, thanks again

[MDuckett1]

Hi All,

Thanks for the help, this is definatly a physical problem I have now bypassed this link and am temporarily linking this switch through another.  I now have to try and find out whether its the fibre cable itself or the GBIC's which will be interesting with no fibre testing equipment!

Mike