From: Brad Hedlund (BHedlund@xxxxxxxxxxxxxxxxxxx)
Date: Tue Dec 14 1999 - 18:19:28 GMT-3
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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