H3C SR6600 Configuration Manual

Also see for SR6600 SPE-FWM: Configuration guide Configuration guide Command reference Command reference Command reference

Contents

16-116 MPLS QoS ConfigurationThis chapter includes these sections:z MPLS QoS Overviewz Configuring MPLS QoSz MPLS QoS Configuration ExampleMPLS QoS Overviewz The MPLS-related knowledge is necessary for understanding MPLS QoS. For more informationabout MPLS, see MPLS Basic in the MPLS Configuration Guide.z For more information about EXP precedence, traffic policing, priority marking, and congestionmanagement, see QoS in the ACL and QoS Configuration Guide.In the area of QoS, in order to provide the support for differentiated services (DiffServ) as IP does,MPLS uses three bits analogous to IP precedence, called EXP bits to carry class-of-service information.With the EXP bits, MPLS QoS is achieved to identify different traffic flows and implement differentiatedservices, thus guaranteeing low delay and low packet loss ratio for voice and video traffic.MPLS QoS provides the following functions:z Classifies traffic on the PE to apply differentiated QoS strategies for different traffic classes. Forexample, MPLS QoS can organize packets with EXP value 1 into a class and packets with EXPvalue 2 into another class, and then perform traffic policing and priority marking for each class ofpackets.z Maps the IP precedence to the EXP field of the label when a PE labels a packet. In this way, theclass information carried in the IP header is carried in the label.z Performs differentiated dispatching (such as PQ, WFQ, or CBQ) between a P device and a PEaccording to the EXP field to provide differentiated QoS for labeled traffic on an LSP.