A policy map specifies which traffic class to act on. Actions can include trusting the CoS, DSCP, or IP precedence values in the traffic class; setting a specific DSCP or IP precedence value in the traffic class; or specifying the traffic bandwidth limitations and the action to take when the traffic is out of profile. Before a policy map can be effective, you must attach it to an interface. Try the below config to limit the traffic to 1 mb inside the LAN.
Switch(config)# policy-map flow
Switch(config-pmap)# class ipclass1
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police 100000 1000 exceed-action policed-dscp-transmit
apply the policy to output of the interface
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# service-policy output flow