Cisco Cisco ISA570 Integrated Security Appliance Leaflet
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Application Note
© 2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information.
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• Support dedicated bandwidth.
• Prevent and manage network congestion.
• Set priorities for users, applications, and services.
Enabling QoS Features
Use the Networking > QoS > General Settings page to enable QoS features on each interface. Until you enable QoS,
other configuration pages are unavailable and traffic is handled on a best-effort basis.
Configuring QoS for Your Internet Traffic
Most network congestion involves traffic to and from the Internet, through a WAN interface. To control traffic and
prevent issues such as delay and jitter, you can classify traffic and establish policies to ensure that important users,
applications, and services receive priority treatment. For example, you can prioritize inbound traffic for a web server
that you host, or reserve bandwidth for Voice over IP calls. Another approach is to specify the types of traffic that
have low priority.
This process involves the following tasks:
1. Enable WAN QoS.
2. Specify the available bandwidth.
3. Create “traffic selectors” to classify the WAN traffic.
4. Create “policy profiles” to handle the selected traffic.
5. Apply one inbound and one outbound QoS policy profile to each WAN interface.
6. Decide how the priority queues operate (if you are using these queues in your policy profiles).
Specifying the Bandwidth from your ISP
It’s important to specify the upstream bandwidth that is provided by your ISP. Enter this information on the
Networking > QoS > WAN QoS > Bandwidth page. It will limit the upstream rate to the specified bandwidth. If the
upstream traffic exceeds this bandwidth, the traffic will be handled according to the applicable QoS policy profiles and
queue settings.
Tip: Effective bandwidth is typically less than the ISP’s advertised limit. From a practical standpoint, some
administrators choose to specify a rate that is one level below the advertised limit.
Classifying the WAN Traffic
After enabling WAN QoS, use the Networking > QoS > WAN QoS > Traffic Selector (Classification) page to classify
the traffic that is important to you. Traffic selectors tell the ISA, "Watch for traffic that matches these criteria." The ISA