Dell PowerConnect 3348 User's Guide - Page 337
TCP/UDP to Queue Mapping Table. The TCP/UDP table is empty by default., DSCP to Queue Mapping Table.
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QoS includes traffic such as voice, video, and real-time traffic that 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). • Prioritization-Traffic is assigned a priority and queued on the appropriate queue for forwarding. Class of Service (CoS) Information Eight CoS values can be mapped to one of four forwarding queues (queue 1 to 4). Each queue has a different priority. The first queue has the lowest forwarding priority, while the fourth queue has the highest forwarding priority and is not mapped by default. NOTE: In a stacking configuration, Queue 4 is used for forwarding stacking traffic. Therefore, assigning additional traffic to Queue 4 may interfere with stack control. There are three mapping tables: • CoS to Queue Mapping Table. • DSCP to Queue Mapping Table. • TCP/UDP to Queue Mapping Table. The TCP/UDP table is empty by default. The Cos to Queue Mapping Table has default CoS mapping to forwarding queue values: CoS Value 0 1 2 3 4 5 6 Forwarding Queue Values q2 q1 (Lowest Priority = Best Effort) q1 (Lowest Priority = Best Effort) q2 q2 q3 q3 Configuring Quality of Ser vice 337