Re: RFC layer 3 ethernet device for high bw application

On 27 Apr, 21:48, "J.Cottingim" <jcottin...@xxxxxxxxx> wrote:
To me, a 7200 looks to be a good fit for what you've described.

JC

As mentioned, this is a complex combination of
features and I would want to get the reseller to
underwrite the design.

Probably worth a lab test.

I actually think that the Cisco numbers are conservative
since they always quote the throughput
in bps as the packet rate x 64byte packets. Real
works networks usually have an average packet size
much larger that that.

BGP is not processor intensive. You can run
(and many people have I think) BGP on a 2500.
If you had full tables you wuld want to take a look
at the implications of a high packet rate and BGP
but I don't think it will be a problem.

You will need either a software router 3845, 7200
or a 6500/7600. The latter are hardware routers.
I think that the 6500 does GRE and NAT with
hardware assistance so will have bery high throughput.

I all cases certain features can cause packets to be
switched in slower paths. There are two or three paths:-

Hardware (6500)
Fast switched (e.g. CEF) all platforms
Process switched all platforms (inc 6500)

Each slower path is AT LEAST an order of magnitude
slwoer than the immediately faster one.
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00800ca7c9.html
This may get you staretd.


BTW the 4948 should not be on your list.
It has h/w L3 but no h/w NAT or GRE.



.

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