The advantage of the tandem approach is better network control and the ability to block and shape traffic in a timely manner. However, this method also introduces the defect of the point of failure, in order to enhance the reliability of the equipment, usually in the front section of the equipment to add optical circuit protector, so as to minimize the impact on the existing network in the event of equipment upgrades or failures.

Network construction is a huge and complex system engineering, in the deployment of the network, the first consideration is the implementation of business solutions, while the network visualization program is put on the back burner or even not dealt with. Waiting until there is a need for visualization, and then add splitter equipment, which leads to each increase in network visualization equipment needs to be transformed on the existing network, the business and operation and maintenance personnel are a huge challenge.

Expanded Information

Disadvantages of DPI

1, the current form of DPI equipment can not adapt to the "big data", "cloud computing" and other new technologies put forward by the Virtualization requirements, can not adapt to the trend of network cloud.

2, network management, application management, security management, business platforms and other different functional departments have different functional requirements, each planning their own network visualization program, in the same link, may be deployed many times, duplication of construction.

3. Application analysis only needs to extract specific traffic, and the splitter does not distinguish, all traffic will be copied to the DPI device, increasing the pressure on the DPI device, inefficient. Although the traffic is selectively filtered after the deployment of the front-end machine, the filtering rules of the front-end machine are static and cannot be adjusted automatically, and a front-end machine can only serve a specific service, resulting in a waste of resources.

4, in the pre-construction of the network, did not give enough attention to network visualization and application visualization, and so there is a need, and then through the network nodes on the patch, to solve the architectural problems, this solution, there are many generality and compatibility issues, the realization of the inefficiency.