1, small campus network solution (55438+ 10,000 yuan scale)
This is a relatively small campus network, suitable for network applications in a single building. The features of this scheme are as follows (the main features are shown in bold, see below):
(1) Support multimedia applications, including multimedia classrooms, electronic reading rooms and multimedia teaching;
(2) high performance, full exchange, to meet the needs of users;
(3) The management is simple, and the browser mode does not need special training;
(4) system security;
(5)ISDN connection mode, which reduces the link cost by establishing the connection on demand.
The application is as follows:
1 multimedia classroom: 50 multimedia users;
1 electronic reading room: 24 multimedia users;
60 ordinary/multimedia users of campus network;
Internet access, secure WAN access.
The topology of this scheme is as follows:
As shown in the figure, the network equipment includes:
Catalyst2924 switch
a
Catalyst 1924/2924 switch
Wutai
Cisco 1700/800 router
a
Cisco's Catalyst2924 switch is the core equipment of this network. It provides 24 adaptive fast Ethernet ports of10/00m, providing high-speed backbone connection for Branch Switch Catalyst1924 and host servers or network management workstations with large data volume. The 1924 switch has two100m fast Ethernet ports and 2410m ports. 100M is used to connect 2924 or teachers' computers, and 10M can be provided for students' computers and office machines with less data traffic. The multimedia classroom in the picture uses two of them, 1924 or 2924, which can provide network connection for nearly 50 students' computers, and the other three are allocated for e-book browsing and office use respectively. This is a fully switched network. Compared with the * * * shared hub, each port of the switch has its own bandwidth, which can realize multi-channel parallel transmission, avoid conflicts and provide better protection for multimedia information.
Considering that Internet access is the development trend of campus network, routers are used in each solution to introduce the remote connection of WAN. This scheme adopts Cisco 1700, a low-end router of Cisco Company, and provides10/00M internal LAN interface and 128K external ISDN or dedicated line connection, so as to realize remote teaching or teaching broadcasting and other applications through the Internet. ISDN is a dialing technology widely used in China. It charges according to the connection time, the cost is only 2-3 times that of ordinary telephone lines, but the bandwidth can reach 3-4 times, with stable transmission and fast connection. On the basis of basic data transmission, users can flexibly select some functions of the above network devices according to their own needs. For example, the multicast function of routers and switches can provide higher quality of service for the transmission of multimedia information; However, 1924 has two 100M ports, which can establish a fast Ethernet channel with 2924 and realize 400M high-speed cascade in full-duplex mode. In addition, there is a red brick wall sign on the 1700/800 router in the figure, which indicates that the router also acts as a firewall-Cisco's series of low-end routers can have firewall performance through operating system upgrade, undertake packet inspection and filtering while undertaking remote connection, and prevent illegal users from invading the internal LAN-for users connected to the Internet, security is an important factor that cannot be ignored in network design.
The advantages of this scheme are simplicity, low cost, and taking into account the application of teaching, management and communication. The products used in the scheme belong to the low-end devices of Cisco products, which are easy to configure and manage while realizing cost-effective desktop applications: 2924 and 1924 are plug-and-play devices, and do not need to be configured unless special functions are added. 1700/800 is also very convenient to set up and manage, and users will be handy and have no worries.
2. Small campus network solution supporting long-distance optical cable (scale 7-65438+500,000 yuan)
This campus network is similar to the first one, but it is connected by optical cable, which can not only have all the characteristics of the former scheme, but also expand the coverage of local area network, and is suitable for the application of multi-floor campus network.
The features of this plan are as follows:
(1) Support multimedia applications, including multimedia classrooms, electronic reading rooms and multimedia teaching;
(2) high performance, full exchange, to meet the needs of users;
(3) The management is simple, and the browser mode does not need special training;
(4) system security;
(5)ISDN connection mode, which establishes the connection as needed to reduce the link cost;
(6) Using optical cable to support long distance and meet the needs of different users.
The application is as follows:
1 multimedia classroom: 50 multimedia users;
1 electronic reading room: 24 multimedia users;
60 ordinary/multimedia users of campus network;
Internet access, secure WAN access.
In the figure, the central switch is Catalyst2924M, and the two branch switches used for office management and electronic browsing are also changed to Catalyst 1924C, and the cascade links between the corresponding switches are changed to optical cables. In this way, the construction cost is slightly increased, and the equipment composition becomes:
Catalyst2924M switch
One set (with 2/4 port 100BaseFX module)
Catalyst 1924/2924 switch
Santai
Catalyst 1924C switch
two
Cisco 1700/800 router
a
The "m" of switch 2924M stands for modularity, and the 2-port or 4-port 100M-m optical fiber module is selected here. The "c" of 1924C stands for optical fiber, and one of its 100M ports is changed from 1924 100BaseTX (twisted pair) to 100ba setx (optical fiber). The connection distance of multimode optical cable between switches can reach hundreds of meters, which can basically meet the connection distance requirements between buildings in campus, so that even if teaching buildings, office buildings and libraries are scattered in different locations, high-performance LAN applications can still be realized. Two 1924/2924 switches for multimedia teaching are still connected to the 2924M of the same building through twisted pair.
3. Medium-sized campus network solution integrating multimedia applications (scale 1.5-0.3 million yuan)
For schools with more complex applications that need higher LAN performance and diversified remote connections, Cisco has launched a third set of suggestions. Features of the plan:
(1) High-performance all-switching, Gigabit backbone, meeting the requirements of heavy-load network operation;
(2) Virtual network is easy to manage, which improves network security and performance;
(3) Support multimedia applications including multimedia classrooms, electronic reading rooms and multimedia teaching;
(4) Excellent IP/TV multimedia application system to meet users' demand for on-demand and broadcasting, and realize multimedia teaching and management;
(5) The management is simple, and the browser mode needs no special training;
(6) system security;
(7) Bandwidth optimization technology to reduce link cost.
The application is as follows:
IP/TV video-on-demand and broadcasting system without user restrictions;
2 multimedia classroom: 100 multimedia users;
1 electronic reading room: 24 multimedia users;
80 ordinary/multimedia users of the campus network;
16 remote users dial-up to access the campus network;
Internet access, secure WAN access.
The topology is as follows:
The network devices in the figure include:
Catalyst3524M switch
two
Catalyst 1924/2924/3524/3548 Switch
Liu tai
Cisco2620 router
One set (equipped with NM-8AM module)
IP/ TV video software
a set
The LAN core in this scheme is composed of two Catalyst3524 switches cascaded through Gigabit Ethernet. The Catalyst3524 switch has 24 10/ 100M ports and two Gigabit ports, so an Ethernet channel can be established between two 3524s through two Gigabit connections, and trunk connections up to 4G can be realized, and different 1000M link types can be selected (/kloc-0 1000BaseSX, Its 10/ 100M port is used to connect the branch switch and the main server.
The remote connection equipment has also been improved into a Cisco2620 router, which has a fast Ethernet port of 10/ 100M, and a NM-8AM module is selected for it, which can establish eight telephone dial-up connections of 1 15.2Kbps at the same time, so the application is very flexible: users can connect some dial-up links. The other part of the link is reserved for teachers preparing lessons at home or reviewing students. Teachers and students can easily connect to the school's 2620 router by using the telephone line and modem at home to meet the needs of Internet access, data query, electronic browsing and other applications. Considering the unsafe factors such as external invasion of the Internet and illegal dial-up users, the operating system of the 2620 router has also been upgraded to the firewall version, and it has the functions of data checking and filtering.
In addition to the function of remote connection, Cisco2620' s 10/ 100M Ethernet port also provides the possibility for campus LAN to realize VLAN application. By VLAN division of switches, the whole LAN can be divided into several relatively isolated virtual network segments (VLANs) corresponding to different institutions and uses, thus improving the data transmission efficiency within VLANs and the security between VLANs; When different departments (VLANs) need to exchange data, they need to use the router's routing function, which is VLAN routing-VLAN routing can only be completed on LAN ports above 100M, which is why Cisco2620 is selected to realize VLAN application. If routing between VLAN is not required, you can also choose Cisco 1750 router.
In addition to a NM module, the 2620 also has two WIC WAN slots, which can be reserved for future network expansion (such as adding links such as DDN, ISDN or Frame Relay).
Another key of this scheme is to introduce a set of powerful video application software-Cisco's IP/TV. Its main manifestations include:
IP/TV is an integrated client/server application system. The server software is used to collect and store TV images, and the client software can call and watch the images. In addition, there are special management software to manage the image content and user situation.
There are two kinds of applications that IP/TV can realize: video broadcasting and on-demand-the former is that the administrator chooses to play the content and sends it to the designated client in real time or regularly; In the latter, the user selects the required content and plays it to his client;
IP/TV images adopt standard video file formats, such as MPEG- 1, AVI, H.26 1, etc. When the server capacity and line quality are sufficient, the image format with higher resolution can be adopted, otherwise the resolution can be reduced to reduce the burden on the server and line.
IP/TV supports standard real-time transmission and intra-group broadcasting protocols, which is conducive to improving transmission quality, realizing full-screen synchronous playback, ensuring data transmission efficiency and avoiding bandwidth waste;
IP/TV has perfect management characteristics, which can arrange programs, track the audience, see which viewers are watching the broadcast content and which viewers are requesting programs, and give analysis to better plan network bandwidth and other parameters;
IP/TV also provides a problem manager and slides for teaching applications. Students can enter questions by clicking Query Manager in the browser window, and the manager will pass the questions to the monitor for immediate reply or archiving for future supplementary answers. Slide show allows students to watch teaching slides in a window and see the image of the teacher at the same time;
IP/TV is based on the popular WindowsNT operating system and TCP/IP network protocol, and the hardware platform is PC server, which is easy to realize and master, economical and feasible.
Therefore, IP/TV is a very suitable application solution for teaching system. In the topology diagram, the backbone switch 3524 is connected to the main server of IP/TV through the port of 100M, and the multimedia teaching content is obtained and stored by using the camera or satellite antenna. Other teachers and students can serve as clients of IP/TV and receive images through broadcasting or on-demand. In addition, the distance audio-visual education center also has an IP/TV server, which can copy the teaching content of the main server for local students to watch.
4. Three-layer switching large-scale campus network solution (500,000-800,000 yuan scale)
If the school has sufficient funds, the campus network can have many different forms to meet the specific needs of users. Cisco listed two different solutions, and the following is one of them:
Features of the plan:
(1) High-performance all-switching, Gigabit backbone, meeting the requirements of heavy-load network operation;
(2) Virtual network is easy to manage and improves network security and performance;
(3) Efficient three-layer switching, network distribution on demand, and handy management;
(4) Support multimedia applications, including multimedia classrooms, electronic reading rooms and multimedia teaching;
(5) Excellent IP/TV multimedia application system to meet users' demand for on-demand and broadcasting, and realize multimedia teaching and management;
(6) The management is simple, and the browser mode does not need special training;
(7) Powerful security function, and special firewall products support big data access;
(8) Bandwidth optimization technology to reduce link cost.
The application is as follows:
IP/TV video-on-demand and broadcasting system limited by useless families
2 multimedia classrooms: 100 multimedia users.
1 electronic reading room: 24 multimedia users
120 ordinary/multimedia users of campus network
16 remote users dial-up to access the campus network.
High-speed Internet access, secure WAN access.
The topology is as follows:
The network devices in the figure include:
Catalyst3524/3548 switch
two
Catalyst2948G-L3/4000 switch
a
Catalyst 1924/2924/3524/3548 Switch
Liu tai
Cisco26 10 router
One set (equipped with NM-8AM module)
IP/ TV video software
a set
PIX firewall
a
Compared with the previous scheme, the router in this scheme is changed from 2620 of 10/ 100M Ethernet port to 26 10 or 100M Ethernet port of 10M Ethernet port, which is relatively cheap. This is because of the campus. Two main devices were added: Catalyst2948G-L3 and PIX firewall.
Catalyst2948GL3 has 48 fast Ethernet networks, 10/ 100M and 2 Gigabit Ethernet ports, which together with two Catalyst3524 * * build a more powerful network backbone. More crucially, the newly introduced 2948GL3 switch has the characteristics of Layer 3 switching, which not only retains the high line speed of traditional Layer 2 switching when transmitting data between ports, but also integrates the perfect control functions such as auditing and broadcast isolation that were only available in Layer 3 routing before. In the former scheme, VLANs are divided on switches, but when different departments (VLANs) need to exchange data, they need to use the routing function of routers. Now, the same device supports both layer 2 and layer 3 functions for broadcast isolation and full-line speed network interconnection, thus greatly improving the performance of the campus network. If the Catalyst4000 series three-layer switch is adopted, it can also be directly connected with the teaching building and library with the 4000 as the core.
5, Gigabit backbone, 100 megabytes of large-scale campus network solutions (500,000-800,000 yuan scale)
The former scheme emphasizes the third layer switching and network security, while this scheme with roughly the same investment focuses on high-speed data transmission.
Features of the plan:
(1) high-performance full switching, gigabit backbone, 100 Mbps switching to the desktop;
(2) Virtual network is easy to manage and improves network security and performance;
(3) Support multimedia applications including multimedia classrooms, electronic reading rooms and multimedia teaching;
(4) Excellent IP/TV multimedia application system to meet users' demand for on-demand and broadcasting, and realize multimedia teaching and management;
(5) The management is simple, and the browser mode needs no special training;
(6) system security;
(7) Cache improves the speed of WAN and reduces the network cost;
The application is as follows:
IP/TV video-on-demand and broadcasting system limited by useless families
2 multimedia classrooms: 100 multimedia users.
1 electronic reading room: 24 multimedia users
90 ordinary/multimedia users of campus network
16 remote users dial-up to access the campus network.
High-speed Internet access, secure WAN access
The topology is as follows:
The network devices in the figure include:
Catalyst3508G/4000 switch
a
Catalyst3524/3548 switch
Qitai
Cisco3640 router
a
CacheEngine cache
a
IP/ TV video software
a set
Cache, also known as CacheEngine a product used by Cisco to improve the access performance of Internet and Intranet. As can be seen from the name, it is actually a large-capacity storage device, which is specially used to store the web pages visited by users, so that when other users want to visit the same page, they don't need to access and access it through personal dial-up users.
Software application system includes principal's office system, educational administration system, financial management system, file management system, multimedia teaching system, electronic lesson preparation system, electronic reading system, score statistical analysis, question bank and testing system, book management system, principal evaluation system, etc. At the same time, it provides e-mail for every customer on the network.
Building 10 that needs networking: 3 teaching buildings, 2 office buildings, 1 complex building, 1 swimming pool, 1 library building and 2 dormitory buildings;
Have certain requirements for network security;
Topology design:
Considering the advantages of Internet connection and remote dial-up access, leading Gigabit Ethernet technology and good cost performance, customers chose Cisco's network products to build the campus network of Chen Jinglun Middle School.
The network topology is as follows:
Application analysis:
Campus network is composed of fast Ethernet with the highest cost performance and gigabit Ethernet with the best performance. The star topology is adopted. Cisco3548 and Cisco3508 are used as the backbone central switches in the park through gigabit port cascade. The departmental (building) switches use Cisco3524, which is mainly connected with the central switch through 1000BASE-SX. The local switches at all levels use Cisco3524, and the lan switches and departmental switches use 65438+. The switches from the central switch to the teaching building, library building and swimming pool building are Gigabit Ethernet backbones, and the switches to other buildings are 100M Ethernet backbones; Specifically, after the Gigabit ports of Cisco3548 and Cisco3508 are cascaded, * * * provides 8 Gigabit backbones and 1 100m backbones, and then the information terminal is10/00m adapter port. This way of networking according to bandwidth requirements not only saves money, but also gives full play to the advantages of equipment and obtains the best overall cost performance.
As shown in the figure, the school will set up an Internet website and connect to the Internet through a router. In addition, an Internet service center has been established to provide dial-up Internet service for remote users and mobile users, which is located in the school network control center. The router accessing the Internet and the dial-up server in the service center can be realized by Cisco26 10 router, and the interface card with 1 WAN serial port is selected, with a bandwidth of up to 2M, and the Internet is accessed through DDN dedicated line. Optional NM- 16AM module can provide 16 dial-up connection.
In order to realize multimedia teaching, Chen Jinglun Middle School installed Cisco IP/TV software to provide video broadcasting 6 and on-demand services for students in various buildings.
Considering that there are many network devices and the structure is complex, the school also plans to install CiscoWorksWindows, a network management system of Cisco, in the second phase of the project to manage all network devices. Because the whole system uses Cisco network products, the network management of the same manufacturer can manage the equipment more carefully. It has a database of Cisco products, which can bring up the intuitive views of various products and go deep into each physical port to query the status information. And based on the popular Windows operating platform, the interface is friendly and easy to operate.
In terms of security, the school adopted a proxy firewall to check the incoming data from outside; In addition, the server of key services in the school has also set up a perfect user authority record and multiple password verification system, which can implement multiple defenses.
2. Xuzhou No.5 Middle School Campus Network Scheme
Demand analysis:
The campus network will cover the teaching and living areas of the whole school, mainly used for teaching;
There are two kinds of data transmitted in the network: ordinary text and multimedia data. Applications include multimedia teaching, video on demand and so on.
Taking the network center of the experimental building as the core, connecting the network sub-centers such as teaching building, office building, administrative building and library;
The network should have the characteristics of high speed, openness, security and easy management.
Topology design:
Considering that Cisco Network Technology Co., Ltd., as a leading manufacturer in the network industry, has advanced technology and unique advantages in the field of routing and switching, and can perfectly meet the above network requirements, Cisco products are selected as network equipment.
The network topology is as follows:
Application analysis:
The network can be a three-tier structure, and the backbone adopts 100 Mbps switched Ethernet; The first level is the network management center, which is located in the experimental building. Cisco Catalyst2924 switch is used as the core switch, and the second level includes several backbone nodes, which are connected to the campus backbone nodes from the network management center. Catalyst2924 switch is used, and all the backbone nodes from the network management center are 100 megabits interconnected. The third floor is the local area network and stand-alone users from each backbone node to the main building, as well as the hub between floors. They arrive at the desktop or the original hub equipment of each building at the speed of 19 12 (12 10M Ethernet ports and 2 100M Ethernet ports).
According to the floor information exchange process, all floor wiring closets can choose Catalyst 19 12 or hub as the floor switch, and the central server, office server and some clients performing key tasks can also access the network through 100M, forming a network structure for all information points exchange.
The multimedia teaching in the school uses the IP/TV network video system of Cisco Company, and its main applications include courseware making, on-demand teaching, broadcast teaching, electronic reading, distance teaching and so on.