Mudanjiang Education Metropolitan Area Network Transformation Plan

1. Project Background

With the development of network technology, broadband network has quickly become a hot topic in the field of information technology. Especially in the field of educational informatization, broadband-based applications have a bright future. Distance teaching, VOD video on demand, multimedia information dissemination, etc. can only play a huge role on broadband networks.

In order to respond to the spirit of the Ministry of Education on promoting education informatization and implementing the "School-School Connectivity" project, further implement the "Tenth Five-Year Plan" for the development of education informatization in Mudanjiang City, making Mudanjiang a strategic highland for information technology education in the Northeast. During the "Tenth Five-Year Plan" period, a "Mudanjiang Education Metropolitan Area Network" based on optical fiber broadband network will be established throughout the city.

2. Education metropolitan area network design requirements

1. Practicality

The education metropolitan area network project must have the functions of teaching, scientific research, management and communication. The Education Metropolitan Area Network project has created an environment for students to learn, prepare lessons for teachers, obtain information from the outside world, and master advanced information tools. At the same time, it will also play an important role in promoting the daily work in the education field, mainly reflected in the following aspects:

1. Provide auxiliary teaching methods for teachers' daily teaching activities. Teachers can easily browse and query online resources for instructional design and scientific research work; call online resources for classroom teaching; guide and examine students' learning through the Internet.

2. Students can easily browse and query online resources to achieve online "individualized learning". Through online learning, learn the ability to acquire knowledge and process information from the Internet.

3. To create conditions for administrative leaders at all levels to understand and master the daily teaching situation of the school, promote the informationization of daily management in the field of education, and provide work efficiency. School administrators can easily carry out comprehensive management of educational affairs, administrative affairs, student status, finances, assets, etc. At the same time, they can realize the exchange of management data between all levels of management.

4. Build a resource library for teaching, scientific research and management with local characteristics.

5. Strengthen the publicity of the school's external image and establish new channels of contact with society.

6. Broaden the channels of educational information exchange within and outside the school.

7. Improve the utilization rate of the school's existing information resources.

8. Pave the way for the cultivation of new-type high-quality talents.

2. Advancement

1. The system design should take into account the technological development within 3-5 years and reach the national advanced and first-class in the province.

2. The selection of network equipment should have high versatility and strong compatibility, and can support the expansion of working network segments and nodes.

3. Support newly emerged network protocols and multimedia network application software.

4. Teaching software that supports different storage formats (including online VOD on demand, VCD, DVD teaching software, etc.).

5. The network has the functions of transmitting various information media such as voice, graphics, and images, and has the resource sharing function with superior performance.

6. There is a fast exchange function between the terminals in the campus network.

7. The central system switch adopts virtual network technology and has classified control functions for the network.

8. Provide perfect access control for access to network resources. Permission control can be performed on those connected to the Internet.

3. Security

1. The network center has a "firewall" filtering function after connecting to the Internet to prevent network hackers and undesirable content from entering the network system. Similarly, after the campus network is connected to the public network loop, it also needs to have a "firewall" filtering function.

2. It has anti-virus measures and is convenient for catching and killing viruses to ensure the safety of network use.

4. Usability

1. Chinese interface, friendly interface, easy to operate.

2. There is online help.

V. Economical

1. The investment is reasonable.

2. Long service life.

3. Construction task of the education metropolitan area network

Metropolitan Broadband Fiber Backbone Network

According to the requirements of the municipal government, by the end of August 2003, a fiber optic backbone network covering basically the urban area of ​​Mudanjiang and the main counties and cities will be built, and the optical cable will be laid to the school. The places that cannot be laid temporarily will be supplemented with copper cable ADSL, and eventually all schools and educational institutions will be connected to the Mudanjiang Education Metropolitan Area Network. By the end of 2003, most schools in Mudanjiang City will be connected to the education network, thus completing the construction of the entire education metropolitan area network.

Built a three-level system architecture of city information center, school campus network and multimedia classroom

The information center of the Education Metropolitan Area Network is not only a portal site connecting the campus network websites of various schools and the national elementary and middle school information websites, but also an education information resource center and management center. It realizes the Internet access of the entire education metropolitan area network, and at the same time guarantees the safety and reliability of the education network through information filtering and network security. In the planning, it not only considers the international development trend and closely follows the process of world informatization, but also combines the current situation and development plan of Mudanjiang Education. The website is based on making full use of the existing optical fiber broadband communication network resources, using advanced Internet technology, vigorously developing online information source construction, strengthening user management and security management, making it a collection of office management, education, teaching and other functions. All-in-one, safe and controllable educational broadband information network that can provide multiple services including broadband multimedia content.

The campus network of each school is connected to the city data center through optical fiber, and the city data center provides Internet access in a unified manner. Multimedia classrooms include multimedia network classrooms, multi-function electronic classrooms, and class-wide classrooms. Through these classrooms, a wide range of educational resources can truly serve education.

4. Network transformation plan

According to the classification of the campus network, a variety of network architectures can be used. According to the above analysis, the Gigabit Ethernet structure based on layer 3 switching is mainly used in the construction of the campus network. The network architecture is as shown below.

In the network structure shown in the figure, the backbone switch and the secondary switch and the optical fiber connecting the backbone switch and the secondary switch form the backbone of the metropolitan area network, and the secondary switch and the underlying tertiary switch and the connected equipment constitute the work Networking. The network also uses different levels of network firewalls placed in different locations of the network to provide network security protection, and provides an IP telephone system and certificate issuing system for the entire education metropolitan area network. And through the professional network billing system to ensure the service billing of the relevant remote business. Some schools or departments with high security requirements can also build highly secure encrypted tunnels by using dedicated VPN equipment.

The layered network structure is the basic principle of large-scale network design. The layered network structure can obtain good network scalability, which is convenient for predicting and planning network changes.

The Mudanjiang Education Metropolitan Area Network serves the entire Mudanjiang City, and has the characteristics of wide area, complicated application and diverse access methods. The construction of the network needs to focus on the future, and it must be able to be easily expanded to accommodate a variety of different users and applications. Therefore, the design of Mudanjiang Education Metropolitan Area Network uses a layered structure.

The metropolitan area network is divided into core layer, distribution layer and access layer. As shown:

1) Urban network core layer function and structure

The core layer of the metropolitan area network is at the center of the metropolitan area network. It is responsible for the rapid exchange and forwarding of data packets to realize the interconnection with CHINANET / CERNET. Use a mesh network connection in the topology.

2) Distribution layer function and structure

The distribution node implements one or more of the following functions:

a. Expand the port density and types of core layer equipment;

b. Expand the business coverage of core layer nodes;

c. Bring together users of the Education Bureau and users of key schools;

d. To realize the manageability of access users. When the access node equipment cannot guarantee user flow control, the distribution layer equipment needs to provide user flow control and other policy management functions.

The distribution layer is a bridge connecting users, and its position should consider its security. Therefore, the connection between the distribution layer node and the core layer node adopts a protection routing structure.

3) Access layer function and structure

The setting of the access layer node is mainly to access direct users and further expand the coverage of the metropolitan area network, to quickly and effectively access specific geographically distributed school users, and to connect to the distribution layer in a star-shaped manner.

4.1 Core node design

The main goal of the core layer is to provide a high-speed and reliable transmission platform, which is responsible for connecting to the nodes of the distribution layer. The node equipment at this layer should have wire-speed non-blocking routing and forwarding performance, and is responsible for providing high-speed channels for data forwarding throughout the network. . And can provide traffic engineering capabilities, this layer needs to support a variety of access technologies such as high-density Ethernet, xDSL, Cable, etc., to aggregate all kinds of traffic into the core layer. It is responsible for connecting the access equipment of urban schools and education bureaus at all levels. In addition to the wire-speed routing and forwarding, the equipment at this layer is also responsible for most of the control and service processing in the network, such as ACL, QOS, rate limiting and based on Policy routing, MPLS VPN, etc. In response to the requirements of the education authority of Mudanjiang City on the education metropolitan area network and our understanding of the education metropolitan area network, we recommend the use of Gigabit routing layer 3 switching equipment MP8608 / 8616 as the core of the Mudanjiang education metropolitan area network. To meet the needs of more than 100,000 users in the city for the use of various educational resources and the network of educational management.

4.2 High-speed backbone network channel

Two or three MP8608 / 8616 routing network devices are interconnected with 1000M ports to form a load-sharing, redundant backup 2G connection line or 1000M loop to ensure core