What is 400 mpps?

Cisco states that the Sup720 system performance is capable of 400 Mpps for IPv4.

Does that mean 32gbps?
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They are not directly convertible as one is packets per second and another bytes per second. The packet could be various types of sizes (bytes).

mpps = Million packets per second
gbps = Gigabits per second
Hi, it is not that trivail because it depends on the way you configure your Cisco. But read http://ccievault.net/index.php/articles/37-cvnarticles/58-bps2pps, it probably will help you!
MPPS = mega packets per second (across it's switching fabric), IPv4 Packert can be a maximum of 1500 bytes so that would mean that you can have a maximum throughput of

400M * 1500 = 600 Gbytes/sec = 4800 Gbits/sec (gbps)

Of course that assumes that the 400Mpps is capable of sustained 1500 byte packets etc. But this would be referring only to it's switching fabric, and there will be other limitations in the device that will make the real performance different. Switching speed is an importnat parameter as you don't want it to affect your overall speed, So in the above exampleif you had 64 byte packets the you'd be pushing  204 gbps which is more in line of the overal performacne of the device. the you can imagine getting a mix of different size packets etc. This gets complicated. But the bottom line is that wile absolute maximu capability of the switching fabric is going to be way higher than the maximum line speed of the device, you need that to be so to make sure that switching is not going to slow your traffic down.

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Dragon0x40Author Commented:
thanks shelluk, basbasbas and saku99,

What the 4000 mpps is saying that the processor is fast enough to open up the frame headers and make switching decisions on 400 million packets per second?

How big those packets are and how congested the data plane is will determine throughput?
Hi Dragon0x40, yes that's essentially correct.
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