Huawei 3Com Education Metropolitan Area Network Solution

Introduction: In the spring morning of Beijing, in a famous middle school affiliated to a prestigious high school, Teacher Zhang, the head teacher of the second grade (3) class, finished his morning exercises, returned to the office, made tea, turned on the computer, and quickly approved Zhang Xin ’s application for sick leave through the Internet. After that, enter the student attendance management system to check attendance. All classmates except Zhang Xin arrived at the school on time; the screen showed that the students in the self-study class were studying seriously. Teacher Zhang tastes tea and opens the lesson plan, and the new day begins.

The third session in the morning was Teacher Zhang ’s public class, which was broadcast live online. Math teachers from 10 middle schools in the district and leaders of the district education committee in charge of mathematics subjects participated. Teacher Zhang distributed the prepared electronic courseware to colleagues in various schools through the Internet in advance. At 10 o'clock, the open class started on time. The multimedia classroom was filled with students from 2 classes. Teacher Zhang's blackboard content and projection information were displayed in 11 different locations simultaneously. The open class worked well.

At 2 pm, the Municipal Education Commission organized a video conference for teaching exchanges. The conference materials were distributed to the participating teachers through the network. The atmosphere of the meeting was warm ... At 3 o'clock, Teacher Zhang and the experimental middle school Li agreed to discuss the new courseware online, 30 minutes Completed, and in the past, the experimental middle school could not be reached in 30 minutes. Next is lesson preparation, sports activities ...

In the evening, at home, one hour of online question answering and correction of electronic homework from students.

With the rapid development of modern information technology, the combination of information technology and education is becoming a key component of China's current education reform and development, changing the traditional education model.

The popularization of Internet applications has brought unprecedented changes to the development of education, broke the time and geographical constraints faced in traditional education, and realized the dream of facing everyone in the whole society and providing them with lifelong education and training. To comply with this development requirement, it is imperative to build a high-quality, high-bandwidth, multi-service, and comprehensive education comprehensive information network.

However, due to the construction of the education metropolitan area network, it is necessary to connect a large number of information points in its elementary and secondary schools, including teaching buildings, office buildings, laboratory buildings, libraries, etc. The development of a large number of services such as technical exchanges and cooperative services requires that the education metropolitan area network must be a practical, highly reliable, efficient, highly scalable, and highly secure system.

Functions to be realized in metropolitan area network

In order to ensure that the Education Metropolitan Area Network can serve the education informatization reform and improve teaching quality to the greatest extent, the Education Metropolitan Area Network must meet the following functions:

School access service: strengthen the function and enrich the content of the individual campus network, and fully realize the integration and sharing of teaching resource platforms in the entire region.

Abundant educational resources: provide network teaching, distance education, teaching resource library, auxiliary teacher lesson preparation system, school information platform and other forms of resources to serve teaching.

Advanced management methods: through the centralized management and monitoring of network equipment across the entire network, as well as the management of teaching services such as personnel management, financial management, and even the management of student records in the district, to ensure the stability of the education metropolitan area network And sustainable development.

External information exchange and data exchange: To realize the effective communication and sharing of internal and external information, and promote the development of education informatization.

Safe and effective access control: formulate different access strategies according to different user groups, standardize and guide user data flow, and at the same time ensure internal and external network security isolation and effective prevention and detection of external / internal network intrusions.

High-performance multicast technical support: Provides an important guarantee for the development of multimedia audio and video teaching.

Technical requirements of metropolitan area network

Technology selection for basic network construction: It is necessary to fully consider the capacity, scalability, reliability, and cost performance of the metropolitan area network, and make the right networking technology choices in network backbone technology, network architecture, network equipment, and Internet export design.

Metropolitan area network security design: Metropolitan area network users need to protect themselves from intrusion while enjoying the great convenience brought by the network, and need a more comprehensive security solution.

Multi-technology integration: The education metropolitan area network undertakes multiple tasks. Users can implement distance learning, multimedia network classrooms, and conference TV applications through the metro area network. Each application has different requirements on the network, equipment, and structure. How to ensure The reliable, orderly and efficient transmission of these data streams requires a variety of network technologies to protect them.

Network planning and management: Good network planning and management can eliminate hidden dangers and reduce the burden on teachers.

Basic Principles of Metropolitan Area Network Construction

In order to achieve the goal of high-quality and efficient interconnection of campus networks, in the network design and construction, the following network construction principles should always be adhered to:

High reliability: The stability of the network system is the key guarantee for the normal operation of the application system. Therefore, it is necessary to select high-reliability network products in the network design and rationally design the network architecture to maximize the normal operation of the system.

Independence: not only to ensure that the entire education network is a physically independent entity, but also to achieve unified network management of the entire education network; at the same time, each school as the basic network element of the education network should have a certain degree of physical independence, for In the future, each school will develop independent features and lay a solid foundation.

Technological advancement and practicability: In network design, advanced technology should be combined with existing mature technologies and standards, and the current status and future development trends of network applications should be fully considered.

High performance: The network design must guarantee the high throughput of the network and equipment, and ensure the high-quality transmission of various information (data, images), so that the network does not become a bottleneck for business development.

Standard Openness: Supports open protocol standards such as internationally-available network protocols and routing protocols to ensure smooth connection and interoperability with other networks (such as public data networks and other networks) and future network expansion.

Flexibility and scalability: According to future business growth and changes, the network can be smoothly expanded and upgraded to minimize adjustments to the network architecture and existing equipment.

Manageability: Implement centralized monitoring and decentralized management of the network, and uniformly allocate bandwidth resources.

Strong QOS, strong multicast features: Perfect QOS features are particularly important for education networks, and the end-to-end QOS feature mechanism of the entire network will be a guarantee for high-quality network services. At the same time, the strong multicast feature helps to ensure multimedia streaming performance and save bandwidth.

Security: Formulate a unified network security strategy and consider the security of the network platform as a whole. Ensure that key data is not illegally stolen, tampered with or leaked.

Compatibility and economy: While maximizing the availability and continuity of the school ’s existing computer software and hardware resources, the overall investment of the network system is minimized while ensuring the overall performance of the network.

Huawei 3Com Education Metropolitan Area Network Solution

In view of the above situation, and considering the increasing integration of information technology, communication technology and storage technology based on IP technology, Huawei 3Com provides a converged IT solution for the construction of the education metropolitan area network, as well as personalized services to help users build a unified The open platform meets the personalized needs of the industry and education, and ultimately helps users achieve personalized business.

The entire solution is divided into five parts: infrastructure, multimedia network, security planning, storage solutions, and network management and optimization.

1. Infrastructure

The core of the education metropolitan area network is the construction of the network infrastructure. While ensuring the basic requirements of network connectivity, it is also necessary to consider the reliability of the network, including the design of equipment, links and network architecture, and network self-healing capabilities to fully reflect the network. Availability; network capacity and response time; network scalability and technological advancement, cost performance, etc. Based on the above considerations, Huawei 3Com recommends the following two network technologies to build an education metropolitan area network.

One is RPR ring network technology. This technology realizes the perfect combination of SDH and IP technology. It retains the powerful protection switching function of SDH (50ms switching), and is well adapted to data services. The entire ring shares a bandwidth of 2.5G × 2 total 5G. The ring and the outer ring transmit data at the same time, and the inner and outer rings back up each other without additional bandwidth.

RPR technology network construction has the following characteristics:

High reliability, 50ms protection switching;

The nodes are fully connected at Layer 2 and the links are highly reliable;

High bandwidth utilization, full utilization of outer ring and inner ring;

Allocate bandwidth fairly and avoid single node monopolizing bandwidth;

Good expansion ability, plug and play;

Shared ring structure, Layer 2 forwarding, natural support for multicast;

Multi-service carrying capacity, supporting video and voice services;

2 × 2.5G double ring structure, 5G high bandwidth.

In the product system of Huawei 3Com, multiple router products such as NE80 / 40 and SR8800 are the best networking equipment for education ring network (RPR). Among the implemented metropolitan area network solutions, the RPR ring network solution has been positively evaluated by users And widely recognized.

The second is Ethernet ring network technology. Today, Ethernet technology has become the mainstream network technology using various environments, especially after the standardization of the 802.3ae 10 Gigabit Ethernet technology in June 2002, Ethernet technology has become an important technical force in the construction of metropolitan area networks.

Compared with other network technologies, the construction cost of 10 Gigabit Ethernet is lower, and the implementation technology is relatively simple. It is based on the expansion of traditional Ethernet and does not require any changes to the network. Its design is very flexible, almost no restrictions on the network structure, can be switched, shared or router-based. Due to the same heritage as traditional Ethernet, 10 Gigabit Ethernet can be fully integrated into the existing IP network to form a fully IP-based 10 Gigabit Ethernet.

The advantages of this technique are:

The implementation technology is simple, retaining the Ethernet frame format, management tools, etc.

It is easy to upgrade and can smoothly transition to 10 Gigabit Ethernet without introducing new technologies.

Network investment is protected.

Has good interoperability and backward compatibility.

Port prices are relatively low.

Provides 10 times the transmission speed of Gigabit Ethernet.

main problem:

Network structure problem

Redundancy and protection issues

Management and QOS issues

It still has many problems to overcome in terms of scale, end-to-end business establishment, quality assurance, and reliability.

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