Fixed Switch Configuration Guide 17-1
17
Configuring Quality of Service
This chapter describes the following QoS features:
Quality of Service Overview
Quality of Service (QoS) is:
• A mechanism for the management of bandwidth
• The ability to give preferential treatment to some packets over others
• Based upon packet classification and forwarding treatment
You configure packet preference and forwarding treatment based upon a flow’s sensitivity to
delay, delay variation (jitter), bandwidth, availability, and packet drop.
QoS uses packet priority, in conjunction with queue treatment configuration, to determine the
interface’s inbound and forwarding behavior for a packet. Packet preference and forwarding
treatment for a given flow can be applied to roles configured in Enterasys policy.
Without QoS, all packets are treated as though the delivery requirements and characteristics of
any given packet are equal to any other packet. In other words, non-QoS packet delivery is not
able to take into account application sensitivity to packet delay, jitter, amount of bandwidth
required, packet loss, or availability requirements of the flow. QoS provides management
mechanisms for these flow characteristics.
Implementing QoS
QoS determines how a flow will be treated as it transits the link. To determine how a flow should
be treated, you must first understand the characteristics of the flows on your network, and
For information about... Refer to page...
Quality of Service Overview 17-1
CoS Hardware Resource Configuration 17-9
The QoS CLI Command Flow 17-14
Port Priority and Transmit Queue Configuration 17-15
Port Traffic Rate Limiting 17-17
Note: A flow is a stream of IP packets in which the value of a fixed set of IP packet fields is the
same for each packet in the stream. Each packet containing the same value for all of these fields is
considered part of the same flow, until flow expiration occurs. If a packet is viewed with any set
member field value that is different from any current flow, a new flow is started based upon the set
field values for that packet.
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