The full name of QoS is quality of service, and quality of service technology is developed under this background. QoS technology itself will not increase the network bandwidth, but how to allocate bandwidth for various services in a balanced way according to the different needs of various services under limited bandwidth resources.

To provide end-to-end service quality assurance is simply to divide traffic into three or six categories, treat different traffic differently, give priority to important traffic services, delay forwarding or even discard unimportant traffic.

Application of QoS in enterprise network

3. 1 Access layer service identification As a border switch, the access switch needs to be responsible for data flow identification, classification and traffic marking on the access side; On the network side, it needs to undertake the work of congestion management, congestion avoidance and traffic shaping for different application data streams.

3.2 convergence layer/Core Layer provides differentiated services. Convergence layer and core layer device ports trust QoS parameters based on access layer identification, and realize QoS policies through queue scheduling, traffic shaping, congestion avoidance, etc. To ensure that high-priority services are scheduled first.