Network Integrated Solution SME Solution Campus Network Program
I. SME program According to the State Economic and Trade Commission, the number of small and medium-sized enterprises in China has exceeded 10 million; 60% of total output values come from SMEs and provide more than 70% of employment opportunities for society. However, it is a small and medium-sized enterprise that has always been critical in China's national economy and society, and its information is very late. Therefore, the Chinese government attaches great importance to the information construction of SMEs, and the "SME Year" in China is China. After a period of implementation, SMEs have achieved gratifying results, but there are also many companies that are unfamiliar with the networking schemes of the network, here to write to everyone. According to the size of the enterprise, the complexity of the network system, the network application is different, the user is different from the needs of the network, from simple file sharing, office automation, complex e-commerce, ERP, etc., this is the general of SMEs Application is some discussion.
The simplest application is the simplest application of the network, which is connected to a number of computers, which makes a peer-to-peer network, and the computer can share resources with each other. If one of them installs printers, modem, etc., the rest of the computer can pass Network system, shared printer and modem, file printing, online query, etc., using corresponding software, you can complete order management, information query, data statistics, etc. Its network topology can be represented as: On PC N, you can install network management software such as Proxy, Firewall, to prevent external attacks, authorize internal employees, and the number of users is only an increase in ports, which can be used Stack, cascaded, use high-density port network node devices to implement. If a large or real-time data communication is required in the work, it can be used to replace the hub in Taiwanese switch, such as processing multimedia or graphical design, such as in operation. For further, in the security, Internet access mode, there are more requirements, the router can be used as a device connected to the Internet, and the specific topology is: In this scenario, the router can be connected to a specific network via DDN line (eg In the Internet, Industry Networks, provide a higher speed, secure connection, or use ISDN / MODEM, connected to the Internet via dial-up. Between the routers and hubs, you can set up a server installed with two NICs, which are connected to the router and hub, as a gateway, run firewall software, etc., to perform network management and security. In the program, use ISDN / MODEM as a unified export to avoid a MODEM for each PC, reduce the purchase fee, and easy to manage; and use a server plus network management methods (that is, the method of Figure 1), Saving a certain extent, it may cause system instability, more difficult to maintain and manage, so it is best to use the router as an interface to connect the WAN as the basis of funding. The general application has been a certain size, and there have been several departments in the interior. If all sectors have no difference in the peer network, not only make many sensitive data is easily acquired, but also within the department A large amount of communication, it will also occupy a large number of network resources, so that the efficiency of the entire network is low, even causing crash. In order to overcome this problem, it is necessary to form a computer that often communicates (usually in the same department), so that a large number of internal data is limited in the subnet, and then connect each subnet together to form a local area network. The specific topology is shown in Figure 3. For a relatively large application, in addition to the network management server, it is recommended to use a dedicated server for database management, file management. At the same time, as a network management host, permission can be limited, subnet divide, etc., can also make MIS, ERP, and even web pages, etc. The system is placed in the server. If DDN is used to connect with a wide area network, you can also load an email service. The biggest advantage of this is that it can be easily managed and maintained. Use a switch in the center to increase the performance and speed of the entire network, and the computer in each subnet is connected with a hub. For sectors that are more important, daily data, such as financial sectors, can consider using departmental servers, store important data, and run firewall programs, block illegal access. The hubs of the ordinary department can be connected directly to the center. For external devices such as printers, plotters, the center or corresponding sector can be placed as needed; and internally, a large number of data transmission can be required, and the switch can be used to replace the hub as a network node of the department.
Branches When the company has further developed, a branch may need to establish a branch, and a branch of geography has a certain distance, and still need to share information interior and achieve office automation. There are many ways to connect to the headquarters, but the form is basically similar, and the example is illustrated in Figure 4. In the scenario, the branch is connected to the point-to-point connection with the headquarters router, and the connection mode can be used, or the ISDN / MODEM can be connected via a dial-up connection, and the headquartered router is used as the dial-in. If the branch is connected to the headquarters, although the two networks are geographically, they can be seen in the network, and the branch can also access the Internet through ISDN / MODEM; if ISDN / MODEM and headquarters Connect, the Internet cannot be connected via ISDN / Modem. In addition to using a wide area network port or backup interface to connect to the branches, the Route is connected to the branches, and use another wide area network interface to provide an external interface for the entire enterprise. If the branch structure and headquarters are in a city, ISDN / MODM, even DDN can be accepted for many companies; if distributed in two cities, the branch can also be connected to the Internet, connecting to headquarters through VPN mode. You can save a lot of fees, but also guarantee safety, but there is a decrease in real-time. Summary For small and medium-sized enterprises, networking methods, network structure, network equipment can be more different, and it is important to determine the application and function of the network, and the good network topology, excellent products can be provided for data transmission. Significant guarantee. Second, the campus network program, the total network products can form all lines, applications in all walks of life in government, bank, finance, insurance, postal, enterprises, schools. Below, the school network program is used as an example, analyzes the application of the full range of network products in the plan. First, the function of campus network is to form a campus network, which is to form a computer network that is substantially capable of covering the entire campus, connects various computers, servers, and terminal devices in the school and connects to the WAN via a certain interface. Based on these networks, the system is formed in the campus, and the campus and external information is used to establish a computer environment that meets teaching, scientific research and management needs. It provides adequate network information services to the various personnel of the school, teaching in the network environment. , Research, collect information, etc. The basic features of the campus: email system: mainly carry out activities with peers, technical cooperation, academic exchanges, etc .; documentation FTP: Mainly uses FTP services to obtain important scientific materials and technical texts; Internet service: Your own homepage, using external web pages for school promotion, provide various consultations, etc., using internal web pages, such as publishing notices, collecting student opinions, etc. Computer teaching, including multimedia teaching and distance teaching; library access system, for computer query, computer search, computer reading, etc .; other applications, such as large distributed database systems, hyperfeit computing resource sharing, management systems, video conferencing, etc.
Second, campus network design requirements As an advanced multimedia campus network, the integrated business information management system including book intelligence information, school administrative office is needed, providing a teaching and research in network environments for major faculty, researchers and students. The advanced platform for work. Campus Network covers the entire school park, and should consider the following requirements on network performance:
Data processing, strong communication processing power, fast response speed; network operation security, high reliability, system easy to expand, easy to manage, easy to increase; main network support multimedia, group, image interface application, support high-performance database software Continuous growth of the package; the system openness, good interconnectivity; the local area network can easily reach the dial-up access of the remote user, but also meet special users to efficiently enter the wide area network, flexible; with strong distributed data processing capabilities. At the same time, in the formation, there is also the following requirements for online products:
Adhere to openness, international standards and general standards; adoption of advanced and mature technologies; easy technology updates and network expansion; practical, cost-effective;
Third, the program design campus network network mainly includes campus office system, internal home page, internal email, multimedia classroom, e-library system, campus IC card management system, internal information service system, etc .; 1. Overview Figure 2.1 Campus network topology map The above figure is the topology map of the campus network. In the system, the entire network is composed of network center, office net, multimedia classroom, IC card system, dormitory net, library subnet, etc., the network center is the main system of the entire network. It is the total node of the network, and the remaining subnets are functional subnets, establish corresponding network environments, adapt to various applications. The network center constitutes the total node, the center of each subnet as the secondary node. The network center uses the real-Daxian STAR-S28G08 intelligent modular switch, in order to meet the high speed, high performance requirements, it is recommended to use the exchange structure at the secondary node, the switch can be selected by the STAR-S1817G, STAR-1824F, STAR- 1924F, STAR-S1824 / S1816 / S1808, the secondary switch is connected to a sub-switch or hub, and the server is connected to these switches or hubs. If you need to strictly control on funds, the secondary switch can also be changed to the hub, which will be affected at speeds. 2. The network center network center has formed a backbone network, which is the total node of the entire campus network, and provides a wide area network and dial-in service. The main advantages of using the Ethernet structure in the backbone network system are:
Gigabit Exchange Ethernet can provide 1G bandwidth for each port, fully meet the needs of users; economic use, high cost performance; Gigabit Ethernet has been widely supported; from existing traditional Ethernet You can smoothly transition to Gigabit Ethernet, do not need to master new configuration, management, etc .; Gigabit Ethernet technology has good interoperability and has backward compatibility.
Figure 2.2 Network Center Scheme Design
In the plan, the central computer room places a central switch, server group, router, rack MODEM and other network devices, with a central switch as a center, and the star topology is connected by no shielded twisted cable. The connection between the network center and the subnet is connected to the switch or hub of the center switch and the subnet through the fiber and no shielded twisted cable by the distance from the subnet. 3, center switch
For a central switch, it is recommended to use the real-Daxian STAR-S28G08 intelligent modular switch. STAR-S28G08 provides 8 slots, with optional modules, can provide Gigabit fiber interface (8), 100M fiber modules (32), 10 / 100m RJ45 interface (64), and management modules, stacking modules . Optional module is:
M2808T 8 port 10 / 100m RJ45 interface
M2804F-M 4 port 100M multimode fiber interface
M2804F-S 4 port 100m single mode fiber interface
M2821S 1 port 1000M fiber interface
MC2831 management module
MC2881 stacking module
STAR-S28G08 In addition to rich interface selection, STAR-S28G08 has a perfect management function that helps network administrators better plan and manage networks, which can be applied to the backbone network, which can be applied to high-bandwidth, high-port density, multi-port types The fiber medium is required, and the gigabit rate is required.
4, the external connection interface main network, that is, the entire campus network and the external connection interface can be divided into two, one is connected to the WAN, one is as a service center, and the external user is received through the dial-up access campus network. Figure 2.3 External connection interface When connecting to a wide area network, the BRD STAR-R2501 router can be used, which has two wide area network interfaces, a local area network interface, a backup port, a control port, which can support PPP, frame relay, x. 25, HDLC, dialing and other protocols. Two wide area network interfaces can be connected to a wide area network using DDN or frame relay. Two wide area networks can be used simultaneously, and the backup interface can be used as a backup line. When the line fails, ISDN / Modem dial-up can be used to connect to a wide area network. The backup interface can also be dial directly to the WAN as the basic port of the WAN. In order to access the campus network to remote users, such as students, teachers from home, the network center must provide remote dialing services. In this service, you can use the STAR-R2501 remote access to the router or 336 nms rack MODEM. In addition to the same functionality with STAR-R2501, STAR-R2501 has eight asynchronous ports, which can connect up to 8 ISDN or Modem as a response device, remote users can log in, enter the campus network . The 336NMS rack MODEM provides up to 16-way dial port, which can also receive 16 remote user dial-up access, and provide remote dialing services with the server. The STAR-R2501 and STAR-R2509 can be directly connected to the central switch, or can also be connected to the center switch through the proxy server, but the latter has increased the cost, but greatly increases the security of the network; 336NMS rack MODEM must be connected After the proxy server is connected to the center switch. 5, the office network school management agency as the central management system, coordination, organization of the school work, in order to adapt to the function of the management agency, the office network needs to complete the data generation, modification, query, Work in office automation, personnel data management, curriculum management, etc. Figure 2.4 Officer Network Office Network and Network Center information is more communication, accessing a large number of data, there are also demand for audio, video, etc., the recommended switch can adopt STAR-S1817G, the switch with a Gigabit fiber module There is 1G bandwidth when there is a central switch with the network center, sufficient to adapt to the application of various occasions. If only 100m speed is required, it can be based on the distance from the center of the network, and the STAR-S1824F / S1924F switch with 100M fiber module is used in accordance with the distance from the center of the network, and the S1808 / S1816 / S1824 switch is used. Of course, when using fiber, the S1808 / S1816 / S1824 switch without a fiber optic module can be used, with the STAR-TFX100 fiber-twisted pair converter. The hub can use STAR-H1208S / H1216S / H1324S, which can be stacked, increase the number of users, and STAR-H1324S can also use fiber optic modules, suitable for use in a distance from the subnet center and requires the use of fiber. Each stacked hub constitutes a node of a subsystem, connects each PC, a terminal device, and the like, and the device within the subsystem can communicate directly, and the contacts of other sectors need to pass the secondary switch. 6. Multimedia teaching son nets In multimedia teaching activities, there is a need for a large number of videos, audio data to transmit, and hub-based hubs based on shared work mode, which are not conducive to these signals. Therefore, it is recommended to use a switch as a primary device. Only when the number of individual users is less, the hub is adopted when the signal quality requirements are not high.
Figure 2.5 Multimedia Teaching Sub-network multimedia classroom and network center data communication is generally not much, but the distance is far, can be based on the classroom, choose STAR-S1808 / S1816 / S1824 with TFX-100 converter or STAR-S1824F / S1924F as The secondary switch, the switch of each classroom is more port number, such as STAR-S1824, or 8 M2808T modules with STAR-S28G08, a total of 64 ports can be used. A good condition can set a server in each classroom, otherwise the server is set in the subnet, which is shared by each classroom. 7. The main function of the library subnet library subnet is to conduct computer literature retrieval, electronic reading, computer borrowing system and literature search on campus online. Due to the number of books, literature, etc., the amount of data is not large, and the hub can be used as a node. Figure 2.6 Library Subnet Library The subnet needs to store large amounts of data, so set the dedicated database server as a data storage, management system, and data store in the CD Tower, Hard Disk Array and other systems, support the visit of the library subnet and campus network users. And query. The amount of data traffic in the library subnet and network center is not large. It is sufficient to use 100M bandwidth, so the secondary switch adopts STAR-S1824F / S1924F or uses TFX100 converters to cooperate with the TAAR 10 / 100M switch, and the terminals in each function subsystem pass STAR-H1208S / H1216S / H1324S and other hub connections. 8, the dormitory in the dormitory net campus is generally distributed in different parts of the campus, but several dormitory buildings in the same location are relatively close, constitute a dormitory group. Since the number of rooms in each dormitory group is more port number, if the exchange cost is relatively high; and the dormitory is mainly used in the network between the dormitory, constitute internal networks between dormitory or dormitory groups. The amount of data is not large with the outside world, so the network system is constituted by the hub. Figure 2.7 Subssenger net in each dormitory, stacked by STAR-H1208S / H1216S / H1324S, providing users in the dormitory building, up to 144 ports, hinges between each dormitory, through hub The switching port is connected. Due to the distance between the dormitory buildings between the dormitory, the use of the switching port can be used to connect the hinges from the hinges without having to use expensive fibers. Each dormitory uses a STAR-H1324S hub to connect the dormitory and campus network through the central switch of the fiber and the center of the network. 10. Campus Network Program Summary In the entire program, the STAR-S28G08 intelligent 8 slot module Gigabit Ethernet switch is used as the center switch of the campus network, which provides 10 / 100m RJ45 port, 100M fiber port, The 1000M fiber port variety combination interface, has network management, stacking function, backplane bandwidth up to 16G, which is fully applicable to this requirement of high-speed transmission, requires high-port density and flexible applications. The network center is connected to the outside world, using the STAR-R2501 router of Zha, STAR-R2509 Remote Access server, 336NMS rack MODEM. In the transmission medium selection of the center switches to each subnet, the application requirements should be based on the application requirements, and the cost is considered. Since the campus distribution is generally wide, the cable is mainly in multimode fiber between the center switch to the secondary switch; if the distance exceeds the limit of the multimode fiber, a single mode fiber needs to be used as the transmission medium.
