Lenovo Education Network stationed in Central Plains

In the booming broadband network construction, the education industry is undoubtedly one of the bright spots. With the continuous improvement of the domestic education informatization level, broadband network education has become a general trend. The education system of Luoyang City, Henan Province has built a 10 Gigabit education metropolitan area network in China, and has become a leading region in the construction of domestic education informatization.

The new metropolitan area networks mostly use open optical transmission platforms. Through the integration of various technologies, voice, data, image, IP access and various value-added services and intelligent services are realized. Compared with the ordinary metropolitan area network, the educational metropolitan area network must undertake the network transmission and exchange of teaching business activities in the area, and a large amount of courseware and multimedia materials need to be transmitted; on the other hand, the education industry also needs to Online teaching provides stable streaming media transmission quality assurance. At the same time, the education metropolitan area network must also be operable and manageable to provide community users with access management needs.

WDM weaving 10 Gigabit network

On the basis of absorbing the technical experience in various fields, Lenovo Network, based on its Tiangong LE 6808 10 Gigabit core switching equipment and all-line IP broadband products, multiplexed wavelength division multiplexing technology, IPv6 solutions and QoS capabilities based on policy routing, Luoyang Education Metropolitan Area Network provides a complete solution from application system to hardware platform.

In response to the specific needs of Luoyang Education Metropolitan Area Network, Lenovo Network adopts a network construction program with WDM technology (WDM) as the core. WDM is a technology that increases the ability of optical fibers to transmit information. It transmits multiple signals simultaneously on the same optical fiber at different wavelengths (or colors). In fact, WDM converts a single fiber into multiple "virtual" fibers, each of which operates independently at a different wavelength.

Education Metropolitan Area Network Topology

Compared with other optical fiber transmission technologies, WDM can avoid waste in trunk capacity expansion, and its capacity potential is unmatched by single wavelength TDM (time division multiplexing) technology. This advantage is extremely important in China's metropolitan area network construction, because the low-cost WDM allows the entire network to be connected from the backbone to the premises network with only one fiber, which greatly saves resources, investment protection and high availability for users Both aspects demonstrate a high degree of unity.

List of star ring structures

In this project, the topology of the entire network trunk is a star plus ring structure: the network core equipment and the information center are connected by Gigabit fiber, and the information center provides users with access protected by firewall security; the network core equipment and four aggregation layer nodes ， Apply 4-way wavelength division multiplexing technology to form 4G link bandwidth to carry most of the network traffic; 4-way wavelength division multiplexing technology is still used between the four aggregation nodes to form a 4G bandwidth loop, while backing up the link Effectively load balance.

As the basic work of data transmission, Lenovo's solution guarantees high bandwidth. In response to the application needs of Luoyang Education Metropolitan Area Network users, Lenovo Tiangong LE 6808 high-performance core backbone multi-layer switch was adopted as the network equipment for the construction of the backbone link of Luoyang Education Metro Area Network in the project, and advanced dense wavelength division multiplexing was selected (DWDM) technology, which keeps the star link from the core layer to the aggregation layer and the ring link bandwidth between the nodes of the aggregation layer at 4G. This design idea has laid a solid foundation for the success of the project.

In addition, the solution has high reliability. Based on the wavelength division multiplexing technology of the trunk and loop, Lenovo network equipment can effectively backup the link (EAPS technology) and routing (ESRP technology). The entire system can complete the self-healing fault within 50 milliseconds. At the same time, in terms of hardware, the Lenovo Tiangong LE 6808 based on passive backplanes formed 100% redundancy, eliminating single-fault nodes.

Lenovo Tiangong LE 6808 all implements wire-speed IP / IPX routing, wire-speed QoS, wire-speed ACL, and wire-speed multicast through hardware. Its maximum wire-speed backplane bandwidth of 384G and wire-speed third-layer packet forwarding of up to 260M Filtering, etc., can provide users with very good exchange performance. The LE 6808 is a 10-slot design, which can provide the port density of ordinary 18-slot equipment, saving deployment and management space. It also has interfaces such as 10G, DWDM, ATM, SONET, POS, and frame relay, and it has great flexibility.