[c-nsp] Cisco 6509 and Bus speeds

[Marcel Lemmen]

Hi all,

My company is looking for a replacement of our Cisco 4006 and we're
looking at the 6509 with Sup720. I do however have some questions
regarding the Bus and backplane speeds which are a bit unclear to me.
Perhaps somebody could help me with this one.

We are looking for a configuration with a Sup720, 2x 4 port 10GE
line-cards, a 48port 10/100/1000 and a 24port 1GigE SFP.

I have some nasty experiences with promised performance and actual
performance, like a 7500 with GEIP+ witch only handles 400Mbit/s, a 4006
switch with 3x24Gbit/s SwitchEngines and gives packetloss at 1.8Gbp/s etc.

The c6509 with Sup720 can handle 720Gbps of switching traffic in total,
but what happens if I transfer 40Gbps from one slot to the other slot with
4x10GE (since we have 8 10GE ports)? As far as I know the c6509 has a
8Gbps backplane and therfor you shouldn't be able to transfer more then
8Gbps from one slot to another, or am I wrong in this one? Using dCEF it
would be possible to transfer 40Gbps of traffice within one slot but not
between slots or not?

Could someone explain this to me because I want to know a bit more about
the architecture so I won't make the same mistake as I did earlier :)

Thank you in advance!

With kind regards,

Marcel Lemmen