Re: 6500 Switching Fabric bandwidth 720 is calculated?

We call it "Cisco Math" where I work.

Keller Giacomarro
keller.g_at_gmail.com

On Sun, Jan 22, 2012 at 9:16 AM, ron wilkerson <ron.wilkerson_at_gmail.com>wrote:

> 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?
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
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Received on Sun Jan 22 2012 - 09:19:20 ART