[j-nsp] GigE: M10 <-> Cisco Catalyst 6509: oversized and corrupted frames

Josef Buchsteiner josefb at juniper.net
Fri Mar 28 10:22:16 EST 2003

At 10:01 AM 3/28/2003, Matti Saarinen wrote:
>Josef Buchsteiner <josefb at juniper.net> writes:
> > We need to differentiate between L2/L1 errors and L3 errors. In your
> > case it is L3. Which means also that your Analyser needs to perform
> > a data integrity check to catch a corrupted IP packet.
>      I think (but don't know for sure. I haven't read the manual
>      carefully enough. The analyser is Fluke OptiView.) that the
>      analyser also checks the IP header. At least, it shows the
>      network utilisation per TCP and UDP port etc.
> > When you performed the  mirror function have you still seen that the
> > 6509 complains about corrupted IP packets ?
>      Yes, I have. I've changed the routing topology as well so that
>      more traffic is going via the GigE link. The error messages
>      haven't been showing up more frequently.

I just got informed from the cisco tac that corrupted ip packets will be 
by the switch engine PFC/PFC2 which is reason you can not see any error
on the analyzer at all when mirror the data ...

>- Matti -
>juniper-nsp mailing list juniper-nsp at puck.nether.net

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