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forwarding rate of Catalyst 2960G-48TC-L

why the forwarding rate of Catalyst 2960G-48TC-L is only 39.0 Mpps while the same for Catalyst 2960G-24TC-L: is 35.7 Mpps.

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Re: forwarding rate of Catalyst 2960G-48TC-L

Minimum packet size Ethernet requires 1.488 Mpps per gig for wire rate. The 2960G-24TC-L has 24 gig ports, so 24 * 1.488 = 35.712 Mpps. The 48 port would require double that, but likely the forwarding hardware (likely the same for both switches) tops out at 39 Mbps.

BTW, both switches have a 32 Gbps fabric, but require 48 and 96 Gbps, respectively, for non-oversubscription. Also, PPS required performance drops with increased packet size, so for larger packets, fabric bandwidth could be the bottleneck on either switch.

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