[c-nsp] 3750G vs. Nexus for a SAN

[Phil Bedard]

It doesn't, it buffers until there isn't contention, acting like a  
store and forward switch.

Phil


On Nov 6, 2009, at 4:35 PM, Gert Doering wrote:

> Hi,
>
> On Fri, Nov 06, 2009 at 07:06:53PM +0000, Nick Hilliard wrote:
>> Incidentally, if you're planning to use the N5K as a fancy 1G  
>> switch, note
>> that the system will change the switching mode from cut-through to
>> store-n-forward for GE ports; cut-through is only supported for 10G
>> transceivers.  This may matter for iSCSI.
>
> Out of curiosity: how does it cut-through if it has to multiplex  
> multiple
> ports, as in: packets coming in on port A and B and leaving on C?  As
> soon as two packets overlap (time-wise) on A and B, you can't do
> cut-through...
>
> gert
> -- 
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> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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