Quality Of Service (Qos); Overview Of Quality Of Service; Building Blocks - Extreme Networks BlackDiamond 6800 User Manual

7

Quality of Service (QoS)

This chapter describes the concept of Quality of Service (QoS) and explains how to
implement QoS on the BlackDiamond.
O
VERVIEW OF
QoS is a feature of the BlackDiamond that allows you to specify different service levels
for outbound traffic. QoS is an effective control mechanism for networks that have
heterogeneous traffic patterns. Using QoS, you can specify the service that a traffic type
receives.
The main benefit of QoS is that it allows you to have control over the types of traffic
that receive enhanced service from the system. For example, if video traffic requires a
higher priority than data traffic, using QoS you can assign a different QoS profile to
those VLANs that are transmitting video traffic.
B
UILDING
QoS is determined by one or more of the following building blocks:
• QoS mode — Indicates whether the system should use egress or ingress traffic
classifications. Ingress is the default.
• QoS profile — Includes bandwidth and priority parameters.
• Traffic classification —A method of grouping traffic that has one or more attributes
in common.
B D U G
LACK IAMOND SER UIDE
Q
UALITY OF
B
LOCKS
S
ERVICE
7-1