Zhejiang University of Technology West Zhejiang Branch is located in Quzhou, Zhejiang, a famous scenic spot-the southern foot of Lanke Mountain. It was established with the approval of the Provincial People's Government in April 1985. According to the instructions of the Provincial Party Committee and the Provincial Government, the purpose of running a school in West Zhejiang is to contribute to the economic construction and development of southwestern Zhejiang, and cultivate application-oriented talents with all-round development of moral, intellectual, physical, professional knowledge, and strong practical ability.
In order to meet the needs of education modernization and school informatization construction, Zhejiang University of Technology Zhejiang West Branch is preparing to comprehensively transform the entire campus network, aiming to provide an advanced, reliable, and safe computer network teaching and research environment for teachers and students of our school, and External information exchange, resource sharing and scientific research cooperation support the school's teaching, scientific research and school management.
The construction of the entire campus network is carried out in two phases. The first phase of the project has been completed in September 2001, mainly including the network center and the Xiaohong Building, the new teaching building, the mechanical building, the office building, etc .; the second phase of the project has been determined, including Keshan Single apartment, girl apartment No. 3, new apartment No. 2, new apartment No. 1, party school building, etc.
two. demand analysis
1. Application characteristics of campus network
According to the requirements of the school, we carried out the design of the integrated system of the campus network in accordance with the principle of "unified planning, step-by-step implementation, practical effectiveness, safety and reliability" to meet the needs of the computer system.
The campus network is different from the current general corporate network, and has the following characteristics in comparison:
Large network load: Due to the realization of Video On Demand (Video On Demand), CD-ROM software and data reading, and the use of pure software to achieve media network teaching, the amount of multimedia information has increased greatly, and the network bandwidth requirements are very high.
Large network management and maintenance workload: After the campus network is built, one of the most important applications is multimedia applications. The computer will be used frequently, and the computer will also be used for self-learning. The utilization rate of the computer is high, so management and maintenance The task will be very difficult.
High utilization rate: Because the computer will be applied to daily work, the utilization rate of network equipment and PC is very high.
2. Data type analysis
Information management data (MIS information): The amount of data communication is large, and the rate of increase with time is very high, requiring a certain response speed.
OA and E-MAIL information: The amount of data communication is large, and the growth rate is high over time, requiring a certain response speed;
Desktop video information: The communication time is scheduled, and it is very sensitive to transmission delay and delay jitter, which requires the network to provide a high quality of service guarantee.
3. Network function analysis
For the network system of Zhejiang University of Technology, Zhejiang West Branch, we believe that it should have the following typical network functions and services:
Network reliability: The network must be able to guarantee long-term continuous operation;
Guarantee of network service quality (QoS): It can provide different service quality and transmission and transmission priority for different users and different applications, and can discard priority packets when the network bandwidth is tight;
Network scalability service: to meet the rapid growth needs of Zhejiang University of Technology, Zhejiang West Branch in the next 3 to 5 years, and protect user investment;
Network security services: to ensure the legality of users' access to network resources;
Network multimedia services: use Multicast technology to improve the bandwidth utilization of desktop video systems;
Network management services: configure, monitor, count, and manage the effective operation of the network.
three. Network system solution
1. Network equipment
In the first phase of the project, the network center used a China Digital DCRS-7504 core routing switch as the central switch, using gigabit routing switching technology to build the backbone of the campus network, and switching from 100M to the desktop. The Web server, E-mail server, file server, film and television server and other equipment in the central computer room are directly connected to the 24-port 100M Ethernet module of the DCRS-7504 switch, so that the new network can fully support multimedia network applications such as video on demand and network real-time. Teaching etc.
Digital China DCRS-7504 has 4 slots, here you need to configure an 8-port Gigabit management module MRS-7500-M8GS to build a Gigabit backbone, and a 24-port 10 / 100Base-TX module MRS-7500-24TX Used to connect network center workstations, routers, firewalls and some nearby information points. The management module needs to install the LIC-7504-L3F full three-layer function license chip.
In the second phase of the project, it is planned to add another DCRS-7504, so that two DCRS-7504 can reach 4G bandwidth through two optical fibers for link aggregation (LAG) to increase the bandwidth between the two switches. It can also provide some redundancy.
The access layer switch adopts DCS-3624, DCS-3628S stacking and DCS-3426 independent switches.
Internet access is mainly through renting the IP broadband network of the telecommunications operator. After the 100M fiber is connected to the user terminal, it is directly connected to the external network port of the firewall, and then connected to the core switch DCRS-7504; another 1700 series router is configured to add the MODEM module as RAS to It is used for faculty and staff on business trips to remotely dial into the campus network to access the required resources.
The specific network topology diagram is as follows:
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