To limit the maximum output on a port, use the srr-queue bandwidth limit command in interface configuration mode. Use the no form of this command to return to the default setting. 

srr-queue bandwidth limit weight1
no srr-queue bandwidth limit

Syntax Description

weight1

The port speed limit in percentage terms. The range is 10 to 90.

This example limits a Gigabit interface to 800Mb/s

conf t
mls qos
interface GigabitEthernet0/1
srr-queue bandwidth limit 80
end
copy run start