Re: cut-through switching method

Great Info ,thanks Rick

Regards
Anantha Subramanian Natarajan

On Wed, Nov 4, 2009 at 4:07 PM, Rick Mur <rmur_at_ipexpert.com> wrote:

> Ah that's right. If you are using FCoE the port-to-port delay is VERY
> important to compare to FC switches. That is the reason for changing this
> behavior. The security that store and forward delivers has now been brought
> a layer up to the FC layer. Besides that the Nexus 5000 is positioned as
> top-of-rack or end-of-row switch. Therefor you can use the twinax cables
> (SFP+ to SFP+ cables) which have a very low loss.
>
>
> --
>
> Regards,
>
> Rick Mur
> CCIE2 #21946 (R&S / Service Provider)
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com
>
> On 4 nov 2009, at 22:52, Cristian Matei wrote:
>
> Hi,
>
> Actually, for example, Nexus 5000 Series is using cut-through technology;
> also some metro switches like 4900 have a low-latency ASIC design but still
> use store-and-forward.
>
> Regards,
> Cristian.
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Anantha Subramanian Natarajan
> Sent: Wednesday, November 04, 2009 11:40 PM
> To: Rick Mur
> Cc: Cisco certification
> Subject: Re: cut-through switching method
>
> Great and thanks for clarifying rick
>
> Regards
> Anantha Subramanian Natarajan
>
> On Wed, Nov 4, 2009 at 3:38 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
>
> Since the performance of the current switches is so good it's totally not
>
> needed to change the switching method as it will not improve any
>
> performance
>
> and will only bring you more trouble, because the chance of bad frames is
>
> bigger.
>
>
> Therefore it's also not possible to change. All switches now use the store
>
> and forward switching mechanism.
>
>
>
>
>
> --
>
> Regards,
>
>
> Rick Mur
>
> CCIE2 #21946 (R&S / Service Provider)
>
> Sr. Support Engineer IPexpert, Inc.
>
> URL: http://www.IPexpert.com
>
>
> On 4 nov 2009, at 21:16, Anantha Subramanian Natarajan wrote:
>
>
> Hi All,
>
>
> I have a basic question on switching method on cisco switches. My
>
> understanding is,in the cisco switches the default method of switching
>
> packets is store and forward,kindly correct me if that is wrong.Is there a
>
> command to change it to cut-through method in cisco 3750 switches and also
>
> how we verify the same from the show command.
>
>
> Thank You for the great help
>
>
> Regards
>
> Anantha Subramanian Natarajan
>
>
>
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Received on Wed Nov 04 2009 - 16:09:10 ART