I'm not sure why you would want to limit yourself to 3Mb when your Ethernet port will go up to 10Mb. However, if there is a reason to do so, I would suggest that you configure the QOS and restrict the bandwidth to 3Mb. Then enter the commands below. Also, you should check the IOS, the router model and the command interpretation before applying.
Create a traffic class: Router(config)# class-map class1 Router(config-cmap)# match access-group 101 Router(config-cmap)# exit Create a policy: Router(config)# policy-map policy1 Router(config-pmap)# class class1 Router(config-pmap-c)# bandwidth 3000 Router(config-pmap-c)# queue-limit 30 Router(config-pmap)# exit Attaching it to Interface: Router(config)# interface e1/1 Router(config-if)# service-policy output policy1 Router(config-if)# exit
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