The campus network adopts three-layer design, which is mainly divided into core layer, convergence layer layer and access layer. The core layer is the network center, which is the central node of the whole campus network. The network center is located in the central building of the campus. The network center is equipped with the core equipment of the campus network, such as switches, routers, servers (Web servers, email servers, DNS servers, dial-up servers, etc. ), and reserved the communication interface with the new campus in the future. The core layer switches adopt four high-performance 10Gb core routing switches to realize 10Gb link connection between core layers, 10Gb link connection between core layers and convergence layer, and 100Gb link connection between access layer and desktop. Convergence layer is the node of all buildings and the secondary node of the campus network. A number of backbone optical cables are set up in the campus network according to the region, radiating from the network center to several main buildings and finally connecting to the secondary backbone nodes. Switches installed on convergence layer network nodes are located at the second layer of the network, connecting the core switches in the network center upwards and the switches or hubs in the access layer (floor) downwards. The access layer is the node of each building floor and the third-level node of the campus network. Access layer nodes are LAN devices directly connected to servers and workstations, mainly fast Ethernet hubs or switches.
There are two interfaces between the whole campus network and the outside world, one is to connect to the wide area network (such as CERNET), and the other is to serve as a service center to accept external users to access the campus network by dialing or other means. The new campus and the old campus are connected to each other by renting or buying out communication optical cables, so that the two campuses can share resources, including office language telephones, cable TV programs, video conferences and so on.
The hardware equipment used in the network construction of the new campus includes transmission media, switches, hubs and other equipment, twisted pair, network cards, hubs or switches, broadband routers, ADSL modems, etc. The software equipment mainly includes various application systems and network platforms, such as security authentication systems and network management platform systems.
Transmission medium: mainly including twisted pair and optical cable. Twisted-pair cables are mainly class 3, class 5 and class 5 unshielded twisted-pair cables, and class 5 is used for long-distance connection. There are single-mode optical cables and multimode optical cables, and single-mode optical cables are used for long-distance connection.
Core layer switch: The quality of core switch directly affects the performance of the whole campus network. Modular 10 Gigabit intelligent switches should be selected to support the configuration of redundant power modules and management engine modules. The Ruijie network RG-S68 10E 10 Gigabit core switch is adopted here. Its backplane bandwidth is 1.6Tbps, and it provides 10 slots, which can be configured with redundant power modules and management engine modules. All modules support hot plug, which is beneficial to improve the reliability and stability of the system. It can provide 32 10 Gigabit ports, and the forwarding rate of Layer 2 and Layer 3 switches is 572Mbps. The core and its sub-centers adopt RG-S68 10E switch, and use RG-S68 10E 10M port to connect office subnets, multimedia classrooms, libraries, student dormitories and other subnets.
Convergence layer switch: convergence layer switch communicates frequently with the core switch and needs to access a large amount of data, including audio and video, every day. Convergence layer switches must have sufficient bandwidth. The RG-S3760- 12SFP/GT full Gigabit switch is selected here. Backplane bandwidth is 48Gbps, providing 12 Gigabit port, and the second and third layer forwarding rate is 18Mbps. In addition, it also supports redundant power interfaces, and can be configured with dedicated redundant modules to provide power, which fully supports IPv 6 and can meet the needs of fully deploying IPv 6 networks.
Access layer switch/hub: The access layer switch (or hub) is directly connected to the computer. Because there are many nodes to connect to the campus network, it is necessary to choose stacked switches or hubs. Star-S2 100G series Gigabit switches of Ruijie Network are selected here, which can be configured with Gigabit and 100M modules and can stack up to 8 devices. In addition, this series of switches supports 802.x five-element binding authentication, including user name, computer IP address, computer MAC address, access switch IP address, access switch port number and other elements.
Remote router: The network center usually provides remote dialing service so that remote users (teachers and students) can access the campus network from home. At this time, you can use a router with remote access function. When remote users dial the router through ISDN or modem, they can log on to the campus network. The Star-R2600 modular router is selected here, which can provide 8/ 16 asynchronous port, and can connect 8/ 16 ISDN or Modem as answering equipment. The Star-R2600 router can be directly connected to the core switch or connected to the switch through a proxy server. The latter is more expensive than the former, but the network security is also higher.
Rack modem: The network center can also use a rack modem as a remote access connection device. When remote users dial-up to the device through ISDN or modem, they can log on to the campus network. Choose 336NMS rack modem here, which can provide 16 dial-up ports and accept dial-up access of 16 remote users at the same time. Before connecting to the core switch, the 336NMS rack modem must be connected to the proxy server.
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