CBQoS (Class Based Quality of Service) is a Cisco feature set that is part of the IOS 12.4(4) T and above. This provides information about the QoS policies applied and class based traffic patterns within an enterprise's network.
If you opt to monitor your network with CBQoS, along with Cisco's NetFlow technology, you can achieve an additional insight into your organization's business critical applications utilization. The CBQoS can be utilized to show how these applications are delivered across an infrastructure with defined policies. It is generally available at no additional cost. The QoS statistics provided by CBQoS are made available via SNMP polling and give detailed information about the defined QoS policies applied to interfaces and class-based traffic patterns.
A distinctive network that has no defined QoS policies can run with a best-effort delivery, with all traffic having equal priority and an equal chance of being delivered. But, in case if such a network becomes congested, all traffic also has an equal chance of being dropped. The definition of policies (class-maps defined in policy-maps) allows specific traffic to be prioritized according to its relative importance and uses congestion-avoidance to ensure its delivery.
ManageEngine IT360 has provision for Cisco CBQoS by which it generates reports on the QoS policies that you have deployed. The report is all about the pre-policy, post-policy and drops in different traffic class along with queuing. CBQoS monitoring in such a deep level helps you validate the QoS policies. You can change your policies according to the reports, which you see in IT3. This is a tool, which can be best used for QoS policy validation