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New Member

Query regarding error message

I have a Catalyst 4006 with a L3 card installed. I have noticed on our SYSLOG server that the following message has started to appear:

2002 Oct 20 23:53:24 %SYS-4-P2_WARN: 1/Invalid crc, dropped packet, count = 153254

I can't seem to find any occurances of this error on the cisco site. Has anyone come accross this and what is causing it.

Thank you in advance

  • Other Network Infrastructure Subjects

Re: Query regarding error message

Invalid CRC means you are losing packets due to an invalid checksum (CRC)

This is normally caused by a defective LAN-adapter, a cabling problem or other problems with your physical layer. If you know when these errors have started to appear, think wheter the last modification to your network coincides with this. Then you have a starting point, otherwise you will have to follow the rigourous method:

When the count continues to rise steadyly, try to locate the interface thats causing the errors as follows. Try disconnecting them one by one until the errors stop to increment and check the cabling from there on.

No need to tell you that your users will be disconnected also, but this type of error is often only reproduceable during office hours when all network nodes are active.


Cisco Employee

Re: Query regarding error message

I suggest that you first upgrade to either 5.5(17) or 6.3(9) depending on what s/w you are running currently and monitor. Take a look at a previous post for similar issue

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