A role contains a group of policies that will be implemented on a specified set of router or switch interfaces. You then assign the device interfaces on your network to one or more of these roles. Consistency and simplicity are achieved by having the service template specify mappings of service levels into specific queues and thresholds for all roles. Transmit factor defines the amount of bandwidth reserved for each service level. Buffer factor defines the amount of reserved packets in the buffer for each service level.
Excess action defines the action to be taken on packets that exceed rate limits.
Interclass forwarding allows you to define which services are put on the priority queue. Through the policy editor, you can define classification policies and assign specified flows to one of your service levels. Both flow and aggregate limits can be defined in terms of bandwidth limits as well as normal and excess burst limits. Through the device manager, you can add devices to QPM and assign roles to device interfaces. Through the distribution manager, you can distribute policies to PDPs that will then deploy the roles and policies to specific devices on your network.