With the quality of service (QoS) monitor, you can verify that the QoS policies are working as you intend them to work. The QoS monitor can help you in the planning phase and the troubleshooting phase of QoS.
You can use the monitor to analyze your IP traffic through the system. This helps you determine where congestion is occurring within your network. The QoS monitor can help you continue to monitor your network so that you can adjust your policies as needed.
One of the most difficult parts of implementing QoS is determining what performance limits to set in your policies. There is no specific recommendation because every network is different. To help you determine what values are right for you, you might use the monitor before you start any business-specific policies.
Try to create a differentiated service policy without selecting metering to identify how your current network traffic is behaving. Enable this policy and start the monitor. The monitor's results can help you tune your policies to your specific needs. See a sample monitor policy that identifies how your current traffic is behaving.
You can also use the monitor to troubleshoot problems. Using the monitor output, you can determine whether the parameters that you assign to a policy are being followed. If your policies are appearing in the monitor but do not appear to be affecting traffic, do the following verification:
Related concepts
Planning for QoS Scenarios: Quality of service policies