Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Principles for QOS Guarantees (more) Applications misbehave (audio sends packets at a rate higher than 1Mbps assumed above); PRINCIPLE 2:provide protection (isolation)for one class from other classes 。 Require Policing Mechanisms to ensure sources adhere to bandwidth requirements;Marking and Policing need to be done at the edges: 1 Mbps packet marking and policing H3 R1 1.5 Mbps R2 H2 H4 2616009:Network Traffic Engineering 7:IntServ and DiffServ Page.52616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 7: IntServ and DiffServ Page.5 Principles for QOS Guarantees (more) • Applications misbehave (audio sends packets at a rate higher than 1Mbps assumed above); • PRINCIPLE 2: provide protection (isolation) for one class from other classes • Require Policing Mechanisms to ensure sources adhere to bandwidth requirements; Marking and Policing need to be done at the edges: