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Confused about forwarding rate spec of cisco/nortel/3com

Hello,

I am currently comparing the specs of 3com,cisco,nortel for a new requirement ( Layer 2 edge switches)

These are the forwarding rates of these models obtained form website and brouchures.

3com Superstack 4200 G = 101.2 Mpps

Nortel 425-24/48 T = 10.2 Mpps

Catalyst 2960G-48 = 38.0 Mpps

I think the units are in million Packets per second.

I am surprised that 3com has better forwading rate than comparable cisco and nortel model .So is there a mistake in the way i am reading the specs? Also i know that cisco uses default modified cut-through forwarding method taking in first 64k of frame and then forwarding. So could the reason be they have a lower forwarding rate listed being that 3com is listing their fast forward method spec. Same goes more Nortel who got it way lower than the rest. I know they make switches for ISPs but why the low specs.

Looking for some expert opinions.

regards,

Hazeen

1 REPLY
Silver

Re: Confused about forwarding rate spec of cisco/nortel/3com

The Forwarding rate based on 64-byte packets for Catalyst 2960G-48TC is 39.0 Mpps, where Mpps stands for Millions of Packets Per Second.

Adaptive Cut-Through mode is the default switching mode in Catalyst 2600 series switches. The Catalyst 2600 operates in cut-through mode until it reaches the error rate high threshold set in the Switching Mode. Then, the Catalyst 2600 changes to store-and-forward mode. It will change back to cut-through mode when it falls below the error rate low threshold.

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