From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Tue Dec 14 1999 - 22:52:04 GMT-3
I'm sure you'll get some traffic on this - the Cat 5000 series only
does store-and-forward switching.
Brad Hedlund wrote:
>
> To the best of my knowledge the Cat 5000 uses cut-through switching.
> Therefore, once the Cat recognizes the MAC address it will start immediately
> forwarding the packet out the destination port (and SPAN port, if
> configured). It will not check for a correct CRC field when forwarding a
> packet, that responsibility lies in the recieving host. However, if the
> packet is so corrupted that it cannot read a recognizable MAC address the
> packet will be dropped and not forwarded. The statistics for such a result
> could be viewed with the 'show mac' command.
> If you have a sniffer on a SPAN port you should see all packets that at the
> very least had a valid destination MAC address field.
>
> -Brad
>
>
>
> > -----Original Message-----
> > From: Rahmlow, Howard F. [mailto:howard.rahmlow@unisys.com]
> > Sent: Tuesday, December 14, 1999 1:45 PM
> > To: 'ccielab@groupstudy.com '
> > Subject: Span Command on Cat5000
> >
> >
> > This question came up while working on a CAT 5000 today, in
> > the LAB, and a
> > sniffer.
> >
> > If while using a sniffer on a CAT 5000, I use the span
> > command to see the
> > traffic on one port. Will I see "bad packets" The 5000, is a store and
> > foward switch. Will it not drop "bad packets" before sending
> > them to the
> > spanned port?
> >
> > Thanks, Howard
> >
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