Re: 6500 Switching Fabric bandwidth 720 is calculated?

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 - 13:58:00 ART