The deepening of educational informatization not only improves the teaching quality and efficiency, but also realizes the sharing and network management of educational resources. At the same time, it also puts forward higher requirements for the network construction and upgrading of major universities: the emerging online teaching methods, educational administration systems and the wide application of video on demand make the network traffic increase day by day, which brings great pressure to the existing network systems of major universities. The enrollment expansion of colleges and universities year by year leads to the continuous expansion of the school scale, and the problem of insufficient existing network ports is becoming increasingly prominent. At the same time, with the continuous increase and improvement of university infrastructure, the coverage of the network needs to be further expanded. In addition, due to the increasingly complex network environment, university network communication will face severe security challenges and bring difficulties to network management.
As an important force to fully support education informatization, D-Link, an internationally renowned provider of network equipment and solutions, has tailored all-round and multi-level solutions to the characteristics and needs of large-scale campus network applications, which reflects D-Link's excellent network integration ability and strong technical strength in the education industry.
Network demand
Large-scale campus is large in scale, with many buildings, and even consists of multiple campuses. The number of information points is generally more than 500, so the network coverage can usually reach several kilometers. Coverage is concentrated in multimedia network classrooms, libraries, dormitories, experimental buildings, teaching buildings, office buildings and other buildings. The vast network radiation area and huge access quantity require a strong network core to provide abundant power. At the same time, due to the large number of access units and complex management, we should pay attention to their expansibility and intelligence in equipment selection. In addition, the school network stores a large number of important data such as teaching materials, student files and grades, so the safety of equipment is very important. Finally, the diversified network applications on campus make the network traffic huge and unevenly distributed, which requires the network system to provide sufficient bandwidth and ensure superior stability. Therefore, many factors need to be comprehensively considered in network upgrading construction, including the use of inherent network facilities, flexible network structure, intelligent centralized management, multiple security protection and so on. , to ensure that the campus network can meet the current and future development of network applications and needs.
network structure
After analyzing the characteristics and application requirements of large-scale campus network in detail, D-Link has launched a set of perfect large-scale campus network solutions based on its deep accumulation in the education industry for many years. The whole scheme adopts the standard three-layer network structure, realizes 10 Gigabit connection, and integrates the industry-leading wireless and VoIP technologies for flexible networking, which comprehensively improves the quality of the whole network system. The network topology diagram is as follows:
Topology diagram of large campus network
At the core layer of the network, D-Link chooses the latest high-performance 10 Gigabit core routing switch DES-6500 as the backbone of the network. DES-6500 switch, as the core switching equipment, has a super-large backplane capacity of 352G, which enables all its ports to have full-line speed switching capability, ensuring that under the huge network load, it can always maintain the line-speed Layer 2 and Layer 3 switching. It is an ideal choice for the backbone core routing switch of large campus network.
DES-6500 supports various routing protocols such as RIP, OSPF, IPX-RIP and AppleTalk, which ensures the flexible transmission of routing information in different network environments. DES-6500 has 8 open slots, providing various interface types, and users can flexibly choose access methods according to different network applications. DES-6500 is really designed based on distributed switching architecture, and all data transmitted by interfaces are exchanged locally, which speeds up the data transmission rate. The excellent performance of DES-6500 provides sufficient power for large-scale campus to realize high-speed network communication.
Functionally, DES-6500 provides rich QoS policies, which can not only classify various network tasks, but also adopt different transmission strategies according to different types of data. In addition, hardware-based multicast protocols such as IGMP, GMRP, DVMRP, PIM DM/SM provide sufficient network space and the best network rate for multimedia network applications such as online teaching for campus teachers and students and VOD.
In order to protect the campus network security and protect the school educational administration system and important data from illegal infringement, DES-6500 provides multiple security strategies, including VLAN dynamic division based on 802. 1Q standard, IP filtering function to control network traffic, etc. And fully support the 802. 1x standard, bringing all-round and multi-level security protection to the school.
Due to the relative concentration of teachers and students' online time, the campus network has a huge network traffic in some periods, which is a great test for network lines. In view of this, DES-6500 integrates standard link redundancy functions such as VRRP, spanning tree and port aggregation, and provides hot-plug fault-tolerant modules and redundant power supply for backup, which fully guarantees the stable operation of campus network.
As a network hub responsible for data aggregation, aggregation and distribution, convergence layer plays a key role in connecting the preceding with the following. The main equipment in convergence layer adopts D-Link DGS-3324SRi full Gigabit stacked switch. DGS-3324SRi is a three-layer switch with excellent performance and rich functions. It can be used as a stacked main switch or a high port density gigabit switch with 24 ports connected by copper cables and optical fibers. DGS-3324SRi, as a high-performance extended switching architecture, can work with stacking devices to increase the stacking interconnection bandwidth from 20Gbps to 120Gbps. In the practical application process, school users can flexibly choose the number of stacks according to their campus size.
DGS-3324SRi combines more leading practical functions, and its performance in stability is better. In addition to providing rich QoS policies and supporting compatible 802. 1d and 802. 1w fast spanning trees, DGS-3324SRi also specially introduces the design of redundant power supply to ensure that the built-in power supply can continue to work when it fails.
The performance of DGS-3324SRi in management has also brought a lot of convenience to the school. This product adopts a single IP management mechanism, and has practical functions such as VLAN division, RMON monitoring, DNS relay and link aggregation based on 802. 1Q standard. It fully supports SNMP v 1/v2c/v3 management, which can make network management more efficient, centralized and convenient.
Access layer shoulders the heavy responsibility of connecting all network terminals, and its quality directly affects the quality of network use. D-Link DES-3526 stacked switch is an ideal choice for access layer switching equipment. The high-density 24-port setting and the stacking of up to 32 devices make DES-3526 have outstanding expansion advantages, which can provide rich network ports for the huge network users on campus. Superior virtual technology enhances the flexibility of the network and is very suitable for the rapidly developing campus network.
DES-3526 provides a flexible access mode, which can not only directly connect clients, but also realize flexible network coverage by accessing wireless local area network in libraries, campus conference rooms and other environments that are not suitable for network wiring or need to be connected at any time, so as to meet the networking needs of teachers and students in special places.
Facing a large number of network access terminals, DES-3526 adopts SIM single IP management technology to realize cluster management, which not only saves IP addresses, but also provides a graphical and batch centralized management mode, which is beneficial for managers to centrally control stack groups and simplify network deployment and management processes. In addition, the enhanced functional features and security features of DES-3526 are also an important support to ensure the high-speed and stable network application of campus teachers and students.
Scheme characteristics
Looking at the whole scheme, the D-Link large campus network solution has the following characteristics.
1. The network core adopts DES-6500 high-performance 10 Gigabit switch to ensure the high-speed, continuous and stable operation of the network system under any circumstances. Rich network interface types can not only realize remote connection with educational networks, but also meet the diverse network application needs of campus teachers and students.
2. This scheme provides sufficient, rich and flexible access modes for network terminals. Not only provide high-density PC access ports in teaching areas, office areas and dormitory buildings with intensive network use, but also flexibly introduce wireless connection and VoIP network voice system according to local conditions.
3. The switching devices selected in the scheme have multi-layer switching capability, and provide multiple security access mechanisms based on policies, including VLAN segmentation, IP filtering, 802. 1x, etc., which bring all-round and multi-layer security protection to the large campus network.
4. Intelligent network management can not only realize remote control, but also the unique single IP address management technology greatly simplifies the management steps, realizes the graphical and batch centralized management mode, comprehensively improves the maintainability of the system and reduces the use cost.
5. Rich QoS policies ensure the timely and accurate forwarding of delay-sensitive network data such as audio and video, and provide sufficient network bandwidth and the best network speed for multimedia applications such as online teaching and VOD for campus teachers and students.
On the whole, the large-scale campus network solution of D-Link leads the university network to the expressway, which fundamentally solves the bottleneck of network congestion. The whole network system integrates scalability, intelligent management, security and stability, fully meets the diverse network application needs such as online teaching, network management, resource sharing, VoIP, etc., realizes the harmony and unity of leading network communication technology and educational informatization, and constantly improves the teaching methods and management modes of colleges and universities, providing strong support for comprehensively improving the teaching quality of colleges and universities and further improving the academic and scientific research level. At the same time, the proposal of D-Link complete campus solution has also promoted the informationization of many universities.