Dell PowerConnect 5324 User's Guide - Page 336
Quality of Service (QoS) Overview, CoS Value, Forwarding Queue Values
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www.dell.com | support.dell.com Quality of Service (QoS) Overview Quality of Service (QoS) provides the ability to implement QoS and priority queuing within a network. QoS improves network traffic flow based on policies, frame counters and context. An implementation example that requires QoS include certain types of traffic such as Voice, Video and real-time traffic which can be assigned a high priority queue, while other traffic can be assigned a lower priority queue. The result is an improved traffic flow for traffic with high demand. QoS is defined by: • Classification - Specifies which packet fields are matched to specific values. All packets matching the user-defined specifications are classified together. • Action - Defines traffic management where packets being forwarded are based on packet information, and packet field values such as VLAN priority (VPT) and DSCP (DiffServ Code Point). VPT Tag Classification Information VLAN Priority Tags are used to classify the packets by mapping packets to one of the output queues. VLAN Priority Tag to queue assignments are also user-definable. The table below details the VPT to queue default settings: Table 9-92. CoS to Queue Mapping Table Default values CoS Value 0 1 2 3 4 5 6 7 Forwarding Queue Values q2 q1 (Lowest Priority = Best Effort) q1 (Lowest Priority = Best Effort) q2 q3 q3 q4 (Highest Priority) q4 (Highest Priority) 336 Configuring Quality of Service