The concept IP device that introduces IP layering can fully adapt to the large network application scenario of mobile bearer.
With the rapid development of wireless broadband services and the continuous advancement of base station IPization, mobile bearer networks will inevitably evolve toward packetization, and the introduction of IP devices is the general trend. Traditional IP devices—routers are mainly used in metropolitan area networks and bearer networks. The size of network nodes in a single autonomous domain usually does not exceed 1000. In the mobile bearer field, the number of base stations in large cities often exceeds 10,000. Batch creation, flower expansion, and controller splitting all have a constant impact on network stability, which poses unprecedented challenges for IP devices. The traditional wireless backhaul service is usually carried by the MSTP network and is carried by the end-to-end rigid static pipeline. The core layer, the aggregation layer and the access layer are clearly defined. Since the entire network is static and there is no dynamic control plane, the adjustment of services and networks is all done manually by the network management. On the one hand, network adjustment and faults will not spread through the control plane, and will not affect the network and other services; on the other hand, the access layer equipment only needs to have simple access capability, and will not be controlled from the control level. Convergence and core layer access, the requirements for access layer equipment are very low. IP devices enable dynamic automatic routing through a powerful control plane, and provide flexible expansion capabilities and diverse access capabilities. In the scenario of metropolitan area network and bearer network, the number of network nodes is relatively small, the frequency of network adjustment is also small, the impact of network adjustment and faults is small, and the grades of equipment are not much different, and the pressure on the control plane will not be Excessive concentration on low-end devices. After the IP device with the dynamic control layer is introduced into the mobile bearer domain, can the IP device adapt to the special needs of this large-network scenario? Different device specifications vary greatly. How to reduce the requirements of access layer devices after introducing dynamic control layers? The network is large in scale and frequently adjusted. How to minimize the scope of influence? If the static mode of operation and maintenance is guaranteed to be a smooth transition to a semi-dynamic mode? For the application scenario of the mobile bearer, the IP device solves the adverse effects brought about by the introduction of the dynamic control layer in the large-network scenario through layered ideas. The layering includes physical layering and layering of the control layer. The physical layering is consistent with the layered architecture of the MSTP network, and is divided into a core layer, an aggregation layer, and an access layer. The number of nodes in the access stratum is the same as the number of base stations. Take 4000 points as an example. The ratio of the aggregation layer to the access layer is about 1:30. The number of nodes in the aggregation layer is 130. The number of access rings connected to each aggregation node. For six, the ratio of the core layer to the aggregation layer is approximately 1:10, and the core layer nodes are 13. Control plane layering is a logical concept, that is, logical layering of physical topologies from the perspective of a three-layer routing domain. Specific methods include sub-processes and sub-areas. The sub-regional approach requires less capacity for the aggregation layer equipment, but the isolation between the different layers is not complete. The process of the sub-process has high requirements on the aggregation layer device. For example, the aggregation layer device needs to support multiple routing processes. According to the above networking model, 6+1 processes need to be supported. Currently, high-end routers can support, but the benefits are different levels. It can be completely isolated. Take the sub-process as an example: the core layer and the aggregation layer are assigned to a routing process X, and one or several access rings are assigned to the routing process Y. Then the access layer will have several processes Y, process X and process. Between Y and different processes Y are isolated at the control level, which means that adjustment changes within one process do not affect devices in other processes. After the routing domain is divided in the process mode, on the one hand, the number of core layer and aggregation layer devices in process X is small, the capability is strong, and the difference between the two layers of devices is small. This part can be directly analogized to the existing metropolitan area network or bearer. Network, process Y consists of a small number of access layer devices, which reduces the control level requirements of the access layer devices. On the other hand, because the processes are isolated, the frequent adjustment of the access layer does not affect the aggregation layer and the core layer. The impact is caused, and vice versa, thus solving the problem of large networks in the mobile bearer scenario. For mobile carrier operators who are accustomed to static, the uncertainty and complexity of the dynamic control layer are difficult to accept. For the specific application scenario of mobile bearer, it can be packaged by technology simulation (PW) and network management. The method is to shield the technical differences to the maximum extent, and to realize the operation and maintenance mode of the SDH of the IP equipment by using the concept of pipeline, so as to ensure the smooth transition of the traditional operation and maintenance personnel from pure static to semi-dynamic operation and maintenance. By introducing the concept of layering, the control layer is isolated between the core aggregation layer and the access layer, the access layer, and the access layer. When the requirements on the access layer device are reduced, isolation between different layers is achieved. The device can also adapt to the large-network application scenario of mobile bearer, and implement the SDH-like operation and maintenance experience through technical simulation and network management packaging. Dc Axial Fan ,12V Axial Fan,Dc Axial Fan 12V,Dc Axial Fan 24V Hangzhou Jinjiu Electric Appliance Co Ltd. , https://www.jinjiufanmotor.com