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Problem with input packet errors (WS-C2950G-48-EI)

Posted on 2009-04-08
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Last Modified: 2012-05-06
Hello! I keep getting information on my switch port input errors, but cannot figure out, what kind of device is creating those errors. Is there any way to see on WS-C2950G-48-EI device, what device in ethernet network is sending error packets. I would like to see the MAC of the device. Is it possible for WS-C2950G-48-EI?

I can put *NIX/Windows PC box on the network, to check for errors from "inside", but then I have to know, what kind of software I have to use? Is there any packet sniffers on the net, which collects error packets on switched network?

Thanks.
ix10.ogre.oic.lv#show interfaces Fa0/27
FastEthernet0/27 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 000d.bd3f.02db (bia 000d.bd3f.02db)
  Description: brivibas22-switch
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 100BaseTX
  input flow-control is unsupported output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, 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: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 671000 bits/sec, 84 packets/sec
  5 minute output rate 414000 bits/sec, 83 packets/sec
     1526517221 packets input, 1914184066 bytes, 0 no buffer
     Received 1391408 broadcasts (271322 multicast)
     0 runts, 6 giants, 0 throttles
     1116 input errors, 743 CRC, 367 frame, 0 overrun, 0 ignored
     0 watchdog, 271322 multicast, 0 pause input
     0 input packets with dribble condition detected
     1222472371 packets output, 1163628669 bytes, 0 underruns
     0 output errors, 0 collisions, 3 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
ix10.ogre.oic.lv#

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Question by:fr0x
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Expert Comment

by:chuchyyy
ID: 24094983
What kind of equipments is connected to the port in your 2950 switch ?
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Expert Comment

by:chuchyyy
ID: 24094986
Have you ever try to do a shut/no shut on fa0/27 ?
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Expert Comment

by:chuchyyy
ID: 24094998
You can configure a span on your switch port to analyse the traffic which come through this interface with a basic sniffer. See what kind of traffic is generated...

(sorry for my multiple posts)
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Author Comment

by:fr0x
ID: 24097061
We have Repotec RP-1708K switch connected to 2950 switch port, and yes I tried to shutdown/enable fa0/27 port on 2950 switch. I even set manually speed - 100, duplex full, but this didn't help either.

Could you please write your last post more specific, I could try this option?! Thanks.
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chuchyyy earned 1000 total points
ID: 24097180
You can check this document/configuration about SPAN and RSPAN in a Cisco switch:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml
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Author Comment

by:fr0x
ID: 24098270
OK, I will look in Cisco document. Do you know, if even one error packet comes in Cisco 2950 port, it resets all mac-address-table for that port? Is there any option, where I could set not to reset arp table on input packet error on port?
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Author Closing Comment

by:fr0x
ID: 31567910
Thanks.
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Expert Comment

by:chuchyyy
ID: 24107288
Hum.. It seems weird... Didnt experienced this kind of problem sorry
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