The 3750 is a layer 3 switch. It does support policing. You can do limiting on the interface.
you can use the quick and dirty srr-queue bandwidth limit command.
Limits bandwidth to a percentage of port speed. ONLY works on outbound traffic.
Example:
interface fa0/1
speed 100
srr-queue bandwidth limit 10
This example would yield a 10mbps rate-limit.
or
interface fa0/1
speed 10
srr-queue bandwidth limit 30
This example would yieled a 3mbps rate-limit.
Keep in mind this only works on traffic outbound from the port.
2) Second way;
policy-map ratelimit-policy
class limitclass
police 772 kbps 56 kbyte conform-action transmit exceed-action drop
interface GigabitEthernet4/47
switchport access vlan 503
bandwidth 30000
load-interval 60
speed 100
duplex full
spanning-tree portfast
spanning-tree bpduguard enable
service-policy output ratelimit-policy
end
HTH
