Hello,
a. We cannot do class based egress rate-limiting on 3750.
The only way to do egress rate-limiting is using: 'srr-queue bandwidth limit' command.
For e.g:
Switch(config)# interface gigabitethernet 1/0/2
Switch(config-if)# srr-queue bandwidth limit 70
When you configure this command to 70 percent value, the port is idle 30 percent of the time.
The line rate drops to ' 70 %' of the speed on a gig port i.e 1000 mbps by default down to 700 Mb/s.
b. These values are not exact because the hardware adjusts the line rate in increments of six.
So putting a odd value like 53 or 67 is not recommended.
Also we cannot configure this on the 10-Gigabit interfaces.
c. However, remember this rate-limiting applies to all traffic on the port.
We cannot selectively do rate-limiting for only a certain class of traffic like we can for ingress rate-limiting.
d. Use the following link for reference:
http://tools.cisco.com/squish/2dA0f
Sid Chandrachud
Cisco TAC