Cisco Cisco ISA550 Integrated Security Appliance Leaflet
Application Note
© 2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information.
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Configuring QoS for Your Local Network
If your local network is very busy or includes time-sensitive applications such as Voice over IP, you can ensure that
important traffic is prioritized.
Choosing How to Classify and Prioritize LAN Traffic
To classify LAN traffic, use the Networking > QoS > LAN QoS > Classification Methods page. CoS is the default
classification method. As a general rule, use CoS for trunk ports that connect to devices that use CoS to prioritize
traffic. Use DSCP for access ports and for trunk ports that connect to devices using DSCP to prioritize traffic.
Example: Using CoS values to prioritize LAN traffic
You can specify the CoS value for each port, and assign the CoS values to priority queues to manage the traffic. This
process involves the following tasks:
1. Classify traffic by assigning CoS values to ports.
2. Assign the CoS values to priority queues.
To assign CoS values to ports, use the Networking > QoS > LAN QoS > Default CoS page. In this example, port GE8
is connected to a computer, and port GE9 is connected to a voice gateway. The administrator classifies the voice
traffic by assigning the lowest CoS value, 1, to GE8 and the highest CoS value, 7, to GE9.