Calculating switch performance

[n.somaiya]

HI all,

When we see any performance of switch, it is usually given in PPS and switch fabric is also given.

For e.g Cisco 3750 24 port switch has switching performance of 6,500,000 (PPS) and switching fabric of 32 Gbps.

I would like to know how this two figures are interelated?

Thanks,

Niraj.

[pkhatri]

Hi Niraj,

The switching fabric capacity is the actual forwarding capacity of the switch fabric and provides an upper bound on the throughout possible. The switching performance, on the other hand, is the maximum forwarding rate that has been achieved on the platform by Cisco testing. This forwarding rate will usually be limited by the CPU capacity of the switch etc. That is why you see switches with the same switching performance but different switch fabric capacity.

Hope that helps - pls rate the post if it does.

Paresh