Extreme networks Summit1 Manuale Utente
S
UMMIT
S
WITCH
I
NSTALLATION
AND
U
SER
G
UIDE
8-1
8
Quality of Service (QoS)
This chapter describes the concept of Quality of Service (QoS) and explains how to
implement QoS on the Summit.
implement QoS on the Summit.
O
VERVIEW
OF
Q
UALITY
OF
S
ERVICE
QoS is a feature of the Summit 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.
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 switch. 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.
that receive enhanced service from the switch. 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
B
LOCKS
Quality of Service is determined by one or more of the following building blocks:
• QoS mode
— Indicates whether the switch 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.
Summit.bk : 8QOS.FM Page 1 Thursday, June 18, 1998 9:27 AM