[c-nsp] IP Header Checksum Errors

[Tóth András]

You might try the following elam trigger:

show plat elam trigger dbus ipv4 if IP_CHKSUM_VALID=0

Andras


On Mon, Feb 14, 2011 at 10:42 AM, Ivan <cisco-nsp at itpro.co.nz> wrote:
> Hi,
>
> I have a 6509 running 12.2(18)SXF4.  I find a lot of the following errors
> in the logs
>
> %MLS_STAT-SP-4-IP_CSUM_ERR: IP checksum errors
> %EARL_L3_ASIC-SP-3-INTR_WARN: EARL L3 ASIC: Non-fatal interrupt Packet
> Parser block interrupt
>
> From what I read, these are informational
> (http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801b42bf.shtml#EARL)
>
> While as per the above I could disable the informational message I could
> also try to locate and fix the problem.  I don't imagine SPAN will
> actually SPAN packets with IP header checksum errors and even if it does
> it seems it may be hard to get a sniffer that has an OS that will not also
> discard the packets.  I was wondering if anyone had any ideas or
> experience with this.
>
> Also using ELAM
> (http://cisco.cluepon.net/index.php/Using_capture_buffer_with_ELAM or
> https://supportforums.cisco.com/message/3006679?tstart=-1) would be good.
> I am not sure if the filter can be set to packets with IP header checksum
> errors either....
>
> Cheers
>
> Ivan
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>