Dell PowerConnect 2708 User's Guide - Page 69

Configuring Quality of Service, Quality of Service (QoS) Overview

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7 Configuring Quality of Service This section provides information for defining and configuring Quality of Service (QoS) parameters. Quality of Service (QoS) Overview An implementation example that requires QoS includes 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. The system supports four queues per port. After a packet is classified, it assigned to one of the output queues. QoS Terms: • 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 egress queues. VLAN Priority Tag to queue assignments are user-definable. The table below details the VPT to queue default settings: Table 7-1. VPT to Queue Default Settings CoS Value 0 1 2 3 4 5 6 7 Forwarding Queue Values q2 (Best Effort) q1 (Lowest Priority) q1 (Lowest Priority) q2 (Best Effort) q3 q3 q4 (Highest Priority) q4 (Highest Priority) 69

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7
Configuring Quality of Service
This section provides information for defining and configuring Quality of Service (QoS)
parameters.
Quality of Service (QoS) Overview
An implementation example that requires QoS includes 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.
The system supports four queues per port. After a packet is classified, it assigned to one of the
output queues. QoS Terms:
•
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 egress queues.
VLAN Priority Tag to queue assignments are user-definable. The table below details the VPT to
queue default settings:
Table 7-1.
VPT to Queue Default Settings
CoS Value
Forwarding Queue Values
0
q2 (Best Effort)
1
q1 (Lowest Priority)
2
q1 (Lowest Priority)
3
q2 (Best Effort)
4
q3
5
q3
6
q4 (Highest Priority)
7
q4 (Highest Priority)