Re: 6500 Switching Fabric bandwidth 720 is calculated?

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 - 17:20:18 ART