[c-nsp] C6509 Fabric Switch Capacity

Mack McBride mack.mcbride at viawest.com
Wed Jan 13 12:38:51 EST 2016

For general internet traffic I have pushed the 6704 to 9+Gbps.
This DFC has almost line rate down to about 64 byte packets.
If you are using a CFC the forwarding bottlenecks at the Sup.
Mixing other non-fabric blades in the chassis has a negative impact as well.
But that is true on the 6708 as well, the difference being the 6708 can't use a CFC.
One caveat on the 6500 platform in general is bad things happen if you saturate the bus.
Up to and including reload.

Mack McBride
Senior Network Architect

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Azher Mughal
Sent: Wednesday, January 13, 2016 8:31 AM
To: Simon Lockhart
Cc: cisco-nsp
Subject: Re: [c-nsp] C6509 Fabric Switch Capacity

:)  I agree, performance will vary for smaller packet sizes.


On 1/13/2016 7:24 AM, Simon Lockhart wrote:
> On Wed Jan 13, 2016 at 07:10:09AM -0800, Azher Mughal wrote:
>> For WS 6704 (with DFC3B), I was able to go close to 9Gbps per port
>> across the bus when using Iperf and jumbo frames. Single port on each
>> of the bus gives you line rate of 9.9Gbps.
> Sounds like you come from the Cisco camp of performance testing :)
> Yes, under ideal conditions you can probably get close to linerate on
> them, but stick general Internet traffic through them, and you won't.
> I believe it's a limitation on PPS, so jumbo frames are what let you fill the ports.
> Simon

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