Have a look at this doc for rate limiting examples an 6500 series:
An aggregate policer applies a rate-limiting policy to all traffic in a VLAN or port that matches set classification criteria (defined using an access control list [ACL]). For example, if an aggregate policer defining a rate of 50 Mb were applied to a VLAN containing 10 physical ports, then all traffic matching the classification criteria (set by the ACL) entering those ports in that VLAN would be subject to that policing rule and would not exceed 50 Mb.
