[c-nsp] Cisco 6509 and Bus speeds

[Brad Bonin]

Marcel,

I suggest you work with your Cisco Sales team or a Cisco partner to determine the best hardware configuration.  High bandwidth
between fabric enabled modules can be easily accomplished, however, if high PPS is required, then you need to look at 1) the types
of cards being used in the chassis and 2) whether or not you need DFC's.  

I would take a look at the applications you think will be filling up those 10G ports to get a better feel for your network
characteristics.  From there, you can determine if 15Mpps will suffice (what you get when you mix non-fabric and fabric cards
together w/o DFC), 30Mpps (what you get with fabric enabled cards), or higher (fabric enabled cards with DFC's).  

Or, you can just get 68xx for 10GE and 67xx with DFC3 for all other ports to ensure maximum PPS and BW:-)

Brad
brad at cisco.com 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Marcel Lemmen
Sent: Thursday, January 13, 2005 6:45 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Cisco 6509 and Bus speeds

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
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