CHAPTER
49-1
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
49
Configuring QoS
Have you ever participated in a long-distance phone call that involved a satellite connection? The
conversation might be interrupted with brief, but perceptible, gaps at odd intervals. Those gaps are the
time, called the latency, between the arrival of packets being transmitted over the network. Some network
traffic, such as voice and video, cannot tolerate long latency times. Quality of service (QoS) is a feature
that lets you give priority to critical traffic, prevent bandwidth hogging, and manage network bottlenecks
to prevent packet drops.
This chapter describes how to apply QoS policies and includes the following sections:
• Information About QoS, page 49-1
• Configuring QoS, page 49-5
Information About QoS
You should consider that in an ever-changing network environment, QoS is not a one-time deployment,
but an ongoing, essential part of network design.
Note QoS is only available in single context mode.
This section describes the QoS features supported by the adaptive security appliance and includes the
following topics:
• Supported QoS Features, page 49-2
• What is a Token Bucket?, page 49-2
• Information About Policing, page 49-3
• Information About Priority Queueing, page 49-3
• Information About Traffic Shaping, page 49-4
• DSCP and DiffServ Preservation, page 49-5
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