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CHAPTER
25-1
Cisco ASDM User Guide
OL-16647-01
25
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:
• QoS Overview, page 25-1
• Creating the Standard Priority Queue for an Interface, page 25-5
• Creating a Policy for Standard Priority Queueing and/or Policing, page 25-6
• Creating a Policy for Traffic Shaping and Hierarchical Priority Queueing, page 25-7
QoS Overview
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 security appliance, and includes the following
topics:
• Supported QoS Features, page 25-2
• What is a Token Bucket?, page 25-2
• Policing Overview, page 25-3
• Priority Queueing Overview, page 25-3
• Traffic Shaping Overview, page 25-4
• DSCP and DiffServ Preservation, page 25-5