Input errors on Fastethernet increasing

[Steffen Frederiksen]

Hi

I'm using a Cisco 1812 to route traffic from a small location with 10 users.. Users are complaning about packet loss, and programs with live database connection is freezing..

On the router i've checked one of the Fastethernet interfaces, and I can see that the input errors are increasing constantly. Anyone know what the cause might be? The only thing I can think of is a damaged ethernet cable..

  16955 packets input, 11809421 bytes

     Received 479 broadcasts, 33 runts, 0 giants, 0 throttles

    356 input errors, 356 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     13266 packets output, 3010818 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 output buffer failures, 0 output buffers swapped out

Best Regards,

Steffen.

[avi]

Hi,

This indicate that there is some physical layer problem,

first change the cable & see if the problem resolve or not.

If not there could be the some issue with the service provider.

The last thing to suspect is the router hardware or the physical port.

[Steffen Frederiksen]

Okay - thank you I'll try to change the Ethernet Cable and see if it helps..

[acampbell · Accepted solution]

Steffen

You are seeing rising CRC errors

This could mean that their is a duplex mismatch between the 1812 and whatever the device

is at the other end of the cable.

What is the config for this interface on the 1812 and what

does it connect to .

Regards

Alex

[Steffen Frederiksen]

Hi Alex

It was duplex mismatch.. I've changed it now, and now i do not have increasing CRC errors anymore..

By the way, what is CRC standing for? What does it mean?

Best Regards

[acampbell]

Hi,

CRC = Cyclic Redundancy Check

This is a part of the layer 2 frame which is used to validate the data within the frame

If the CRC is invalid the frame is dropped as an errror

http://en.wikipedia.org/wiki/CRC-based_framing

Most L2 protocol frames use CRCs

HDLC

SDLC

ISDN-LAPD

X25 - LAPB

ETHERNET (802.1)

HTH

Alex

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