Core layer (high-speed switching backbone of the Network), convergence layer (providing policy-based connections), and access layer (connecting workstations to the network ).

A layer-3 network is a layered layer-3 network. The three-tier network architecture adopts a hierarchical model design, which divides the complex network design into several layers. Each layer focuses on some specific functions, in this way, a complex big problem can become many simple small problems. The three-tier network architecture has three layers: the core layer (the High-speed switching backbone of the Network), the convergence layer (providing policy-based connections), and the access layer (connecting workstations to the network ). ,
Core layer: the core layer is the backbone of high-speed network switching and plays a vital role in the entire network connection. The core layer should have the following features: reliability, efficiency, redundancy, fault tolerance, manageability, adaptability, and low latency. In the core layer, a high-bandwidth Ge-or above switch should be used. Because the core layer is the hub of the network, it is important. It is necessary to use dual-host redundancy for hot backup on the core layer equipment. The Server Load balancer function can also be used to improve network performance.
Convergence layer: the convergence layer is the "intermediary" between the network access layer and the core layer. It is to converge before the core layer of the workstation to reduce the load on the core layer devices. The aggregation layer provides implementation policies, security, workgroup access, routing between virtual LAN (VLAN), source address or destination address filtering, and other functions. In the aggregation layer, a switch that supports layer-3 switching and VLAN should be used to achieve network isolation and segmentation.
Access layer: the access layer provides workstation access to the primary network segment. In the access layer, you can reduce the number of workstations in the same network segment and provide high-speed bandwidth to the Working Group. For the access layer, you can select a common switch that does not support VLAN and layer-3 switching.
Comments from the network architecture of L2 switching technology to the network architecture of L3 switching technology, the network optimization effect is obvious, with network management software, network security and protection is greatly improved. By rationally configuring the core switch, the hardware performance of the core switch is fully utilized, and the structure of the core switch in the bandwidth and network traffic processing capacity is adjusted. The core switch has good scalability and VLAN is divided according to business needs, control the broadcast range, suppress broadcast storms, and improve the overall performance and security of the LAN. The reliability of the entire network is enhanced. The core switch adopts dual-host hot backup and load balancing, that is, both core switches normally participate in the work. when either of them fails, the other one can take over its work automatically and seamlessly, which is transparent to network administrators and users without manual intervention. Improve the automatic fault tolerance capability of the network for emergencies and minimize the network failure time. The network scalability can meet the needs of Internet cafes in the future for a period of time, and support the future expansion and network change needs of large Internet cafes.