Re: 6500 Switching Fabric bandwidth 720 is calculated?

Lol, That's what I am trying to explain, 20gb is not 20gb, its 40gb because its 20gb one way, in cisco terms :)

A bit odd way to say, I have a 200mb lan connection because its full duplex :).
Sent from my BlackBerry. smartphone from du

-----Original Message-----
From: ron wilkerson <ron.wilkerson_at_gmail.com>
Date: Sun, 22 Jan 2012 10:16:31
To: <farhan.anwar_at_gmail.com>
Cc: Routing Freak<routingfreak_at_gmail.com>; Dave martin<funccie_at_gmail.com>; CCIE Lab<ccielab_at_groupstudy.com>
Subject: Re: 6500 Switching Fabric bandwidth 720 is calculated?

same marketing as folks calling 100mbps 200mbps due to the full duplex

On Sun, Jan 22, 2012 at 8:58 AM, <farhan.anwar_at_gmail.com> wrote:

> Backplane is the crossbar switching fabric which has 18 inputs of 20gb/s.
> Since, its a non blocking architecture it can take 360gb/s in/out which
> cisco terms as 720gb/s.
>
> There is a Cisco white paper explaining it, I will search it and post
> later.
>
> Sent from my BlackBerry. smartphone from du
>
> -----Original Message-----
> From: Routing Freak <routingfreak_at_gmail.com>
> Date: Sun, 22 Jan 2012 19:14:49
> To: Farhan Anwar<farhan.anwar_at_gmail.com>
> Cc: Dave martin<funccie_at_gmail.com>; CCIE Lab<ccielab_at_groupstudy.com>
> Subject: Re: 6500 Switching Fabric bandwidth 720 is calculated?
>
> hi farhan
>
> Wat do u mean by channel per Backplane and wat do u mean by backplane
> exactly ?
>
>
>
> On Sun, Jan 22, 2012 at 6:50 PM, Farhan Anwar <farhan.anwar_at_gmail.com
> >wrote:
>
> > Dave,
> > The switching fabric is actually 360 GB/s but because it goes in at
> 360Gb/s
> > and out at 360Gb/s and therefore you could count it twice for a 6500,
> > explanation below.
> >
> > Each slot in the backplane of the C6509 chassis has two 20Gb/s 'dual
> > channel' backplane connections, which theoretically makes each backplane
> > connection capable of having 20gb/s in/out (full duplex). Since There are
> > nine slots, and Nine slots at 40Gb/s is 360GB/s. And Because of this dual
> > channel, transfers can go upto 720Gigs in a 9 slot chassis which you
> didn't
> > include in your calculation.
> >
> > Calculate it like the following:
> > [# of Slots] x [No. of Backplane Connections per Slot] x [Channels
> (either
> > 1 or 2)] x [Each Backplane Connection Throughput]
> >
> > # of Slots = 9
> > Backplane Connections / Slot = 2
> > Channels per Backplane Connection = Dual (2)
> > Each Backplane Throughput = 20Gb/s
> > Total Throughput = 720Gb/s
> >
> > The 6513 has first eight Slots as Single Channel and rest of the five
> slots
> > as dual channel. 6513 can have its own advantages if you are not
> populating
> > the chassis with high density gb ethernet line cards.
> >
> > Single Channel Throughput = [ (8 Slots) x (2 Connections) x (1
> > Channels/Slot) x (20Gb Backplane Throughput)] = 320 Gb/s
> > Dual Channel Throughput = [ (5 Slots) x (2 Connections) x (2
> > Channels/Slot) x (20Gb Backplane Throughput)] = 400 Gb/s
> > Total Throughput = 720Gb/s
> >
> >
> >
> > On Sun, Jan 22, 2012 at 3:55 PM, Dave martin <funccie_at_gmail.com> wrote:
> >
> > > As per my understanding 6509 all slots are dual channel, so 9 slot * 40
> > per
> > > slot (20 g in and 20 g out) = 360 GB
> > >
> > > How cisco claim the 720 ?? What about the 6513 chassic switch fabric
> > > connection?
> > >
> > >
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Received on Sun Jan 22 2012 - 16:39:12 ART