Class-based queuing(CBQ) allows a bit more control than PRIQ. In CBQ, each class gets a percentage of bandwidth, after being grouped by classes. It divides traffic into a hierarchy of classes and thus allows you to classify traffic into a hierarchy. Criteria for prioritization can include protocol, the application being used, the IP address of the sender, and many other factors. It operates at the IP network layer (Layer 3). An additional appeal of CBQ is that it is in the public domain.
Each class is assigned a bandwidth limit, and packets within the class are processed until the bandwidth limit for the class is reached. This tends to ensure that even low-priority packets get some bandwidth. The first goal of CBQ is quantitative ...
