network procedures

Network procedures constructs services from the PHBs by classifying packets into "classes" at the edge, or boundary, of the network and marking the packets accordingly. Optionally, the packets can be metered with policing or shaping techniques. The core of the network implements the PHBs and uses the packet markings to make queuing and dropping decisions

The disadvantages of the network procedures model includes no end-to-end bandwidth reservations are present; therefore, guarantees of services can be impaired by network nodes that do not implement the PHBs appropriately over congested links or by nodes that are not engineered correctly for the expected traffic volume of a specific class