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

[Soon Lee]

Hello guys.

 

I m going to take a test cisco 4900, Force10 4810 and Arista 7124 with
Smartbit something like that.

 

Thank you guys for helping

 

Thanks

 

Soon Lee

CCIE# 17724

 

From: Keegan Holley [mailto:keegan.holley at sungard.com] 
Sent: Thursday, March 17, 2011 5:12 PM
To: chetan r
Cc: Soon Lee; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] What is the lowest latency switch?

 





On Thu, Mar 17, 2011 at 3:50 AM, chetan r <chetan.pesit at gmail.com> wrote:

Why not this?
http://www.cisco.com/en/US/prod/collateral/ps6418/ps6419/ps6421/product_data
_sheet0900aecd8029fdf7.html 



<http://www.cisco.com/en/US/prod/collateral/ps6418/ps6419/ps6421/product_dat
a_sheet0900aecd8029fdf7.html>The
data sheet says that it has "<200 nano-second port-to-port latency".

 

You can't really compare infinband to ethernet.  It's kind of comparing a
sports car and a space shuttle.  Infiniband has much higher throughput and
much lower latency in general.

 


On Wed, Mar 16, 2011 at 5:42 PM, 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_cat
alyst_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
>
>
>
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--
Chetan R
Network Consulting Engineer
Cisco Systems Inc

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