[c-nsp] What is the lowest latency switch?

[Soon Lee]

Can I get any document what you say?

 

Thanks

 

Soon Lee

CCIE# 17724

 

From: Chris Evans [mailto:chrisccnpspam2 at gmail.com] 
Sent: Wednesday, March 16, 2011 9:24 PM
To: Soon Lee
Cc: cisco-nsp at puck.nether.net; Peter Rathlev
Subject: Re: [c-nsp] What is the lowest latency switch?

 

Ciscos lowest latency box is the nexus 3000..

On Mar 16, 2011 8:17 AM, "Soon Lee" <leekorean at gmail.com> wrote:
> Hi
> 
> Lowest latency switch hahaha.
> 
> according to this
document(http://www.cisco.com/en/US/prod/switches/ps5718/ps6021/stac_report_
cisco_catalyst_4900m_10gige_switch.pdf)
> 
> Latency of C4900M is 19 microseconds.
> 
> I'm looking for any other vender switch which is low latency switch.
> 
> If you guys inform me then I will test it with Smartbit or something like
that.
> 
> And cisco says,
> 
> Examples of Cisco Low-Latency Layer 2 Switches
> The Cisco Nexus 5000 Series access-layer switch is an example of a
low-latency cut-through single-stage fabric implementation that will meet
the requirements of all except ultra-low latency applications. The Cisco
Nexus 5000 Series uses VOQs to minimize port contention.
> Another platform that meets most low-latency application requirements is
the Cisco Catalystcc 4900M Switch, a store-and-forward switch that fits in
the data center access and distribution layers. The Cisco Catalyst 4900M
uses a shared-memory architecture with an ultra-low-latency ASIC design.
> 
>
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/white_pape
r_c11-465436.html
> 
> does it mean C4900M is lower latency switch than Nexus 5000 ?
> 
> 
> Thanks
> 
> Soon Lee
> CCIE# 17724
> 
> -----Original Message-----
> From: Peter Rathlev [mailto:peter at rathlev.dk] 
> Sent: Wednesday, March 16, 2011 6:09 PM
> To: Soon Lee
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] What is the lowest switch?
> 
> On Wed, 2011-03-16 at 18:02 +0900, Soon Lee wrote:
>> What is the lowest switch?
> 
> The one at the bottom of the rack? ;-)
> 
>> I heard C4900M is low latency switch
>> 
>> Do you know any other vender?
>> 
>> Please let me know.
> 
> I guess the standard Cisco answer to low latency would be the cut-through
switching Nexus platform. Nexus 5000 would probably fit the description. The
4900 is (AFAIK) store-and-forward and thus has slightly higher forwarding
latency.
> 
> Beware that the latency differences are quite small and most peoply have
no need to the lower.
> 
> --
> Peter
> 
> 
> 
> _______________________________________________
> cisco-nsp mailing list cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/