At 4:18 PM -0500 3/25/06, Wojtek Zlobicki wrote:
>Few applications have a requirement for full rate GigE.
Few servers, let
>alone workstations are capable of sustaining 1Gbps in
any direction, let
>alone 1Gbps symmetrical.
This was a very specific design concept in the original 4000
series
switches; I haven't checked the numbers for the models with
higher
port count.
When you are using a switch as a network aggregation device,
you
really want the full bandwidth available. As Wojtek points
out,
certainly most Wintel servers have trouble doing much more
than
300-400 Mbps.
So, there were originally two port cards for the 4000, which
plugged
into a fabric slot with 6 Gbps capability. The 6-port GE
card was
intended for network aggregation applications. The 18-port
card was
intended for host connection, with the simpler cabling of GE
vs.
FastEtherchannel.
>I see no problem with a blocking card. If I have
>a requirement for a non blocking card I can buy one.
>
>On 3/18/06, Joseph Brunner wrote:
>>
>> I verified you numbers using
>>
>>
>>
>http://www.cisco.com/en/US/products
/hw/switches/ps708/products_data_sheet0900
>aecd8017376e.html
>>
>> I am shocked to find out that with 2 x 20Gbps
channels (40Gbps) the card
>> WS-X6748-GE-TX makes the card (not the sup720) a
"block architecture"
>>
>> I thought Cisco didn't sell switches that
block...
>>
>> theoretically that card can push 96Gbps (48 ports
x 2Gbps (1000FDX) =
>> 96Gbps)
>>
>> So the card is oversubscribed by more than 2 fold
!!!! its now a very
>> blocking architecture !
>>
>> Should we start calling it the "Extreme
Black Diamond Sup720" or am I
> > missing something???
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7
&i=108156&t=107812
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.
groupstudy.com/list/cisco.html
|