Limit bandwidth per port switch/VLANs?

Question

I am using a switch to create multiple VLANs. Each network has a separate VLAN port on my 3550 configured. I want to control the bandwidth that port uses and restrict it. Is is there a simple command to do this or will I need QoS.
Basically Fast0/1 - max bandwidth out/in (300K/400K)and so on..
thanks in advance!

Answer 1

You need to configure Policing that will limit the rate users can use going through a particular port/vlan.
Policing involves creating a policer that specifies the bandwidth limits for the traffic. Packets that exceed the limits are out of profile or nonconforming. Each policer specifies the action to take for packets that are in or out of profile. These actions, carried out by the marker, include passing through the packet without modification or dropping the packet.
This example shows how to create a policy map and attach it to an ingress interface. In the configuration, the IP standard ACL permits traffic from network 10.1.0.0. For traffic matching this classification, the DSCP value in the incoming packet is trusted. If the matched traffic exceeds an average traffic rate of 48000 bps and a normal burst size of 8000 bytes, its DSCP is dropped:
Switch(config)# access-list 1 permit 10.1.0.0 0.0.255.255
Switch(config)# class-map ipclass1
Switch(config-cmap)# match access-group 1
Switch(config-cmap)# exit
Switch(config)# policy-map flow1t
Switch(config-pmap)# class ipclass1
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police 48000 8000 exceed-action drop
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# service-policy input flow1t
There is also example on aggregate policing. Here is a link on QoS:
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/swqos.htm#wp1044737
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