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

[Chris Evans]

Talk to your se.. it's due out by end of April.
On Mar 16, 2011 8:41 AM, "Soon Lee" <leekorean at gmail.com> wrote:
> 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
>>
>>
>>
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>