Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Principles for QOS Guarantees (more) Alternative to Marking and Policing:allocate a set portion of bandwidth to each application flow;can lead to inefficient use of bandwidth if one of the flows does not use its allocation 。 PRINCIPLE 3:While providing isolation,it is desirable to use resources as efficiently as possible packet marking 1 Mbps 1 Mbps logical link H3 R1 R2 1.5 Mbps H2 5 Mbps logical link H4 2616009:Network Traffic Engineering 7:IntServ and DiffServ Page.62616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 7: IntServ and DiffServ Page.6 Principles for QOS Guarantees (more) • Alternative to Marking and Policing: allocate a set portion of bandwidth to each application flow; can lead to inefficient use of bandwidth if one of the flows does not use its allocation • PRINCIPLE 3: While providing isolation, it is desirable to use resources as efficiently as possible