The development of router equipment in our country is very rapid, and its market demand is also very high. So I studied the practical application of router equipment and the planning and implementation of multiple computer networking. Here I will share it with you and hope it will be useful to everyone. . With the continuous popularization of informatization, more and more units have felt that they cannot do without the network. Therefore, the establishment of a LAN network suitable for work needs has been mentioned on the agenda of many units. For organizations with hundreds of computers at all times, how to build a network with fast internet access and stable signal transmission has become a "subject" that the network administrator of the organization must carefully plan and design. In order to help all network administrators to skillfully plan and design a lot of computer networking solutions, this article deliberately starts from practice to provide you with a medium-sized network formation plan that contains more than 200 computers to ensure that the unit LAN network formed is not only Fast and stable, and has the ability to upgrade smoothly! Networking requirements A unit building has two floors, and each floor has about 100 computers. Due to work needs, unit leaders require network administrators to come up with a reasonable networking solution to ensure that all computers can be grouped into a local area network, and require that the formed LAN network not only be able to quickly access the Internet, but also have good stability And hope to facilitate maintenance and management in the future to improve the efficiency of network operation and management. demand analysis Generally speaking, a local area network with more than 100 computers can be regarded as a medium-sized network. Such a network requires high transmission speed and stability of the Internet signal, and network administrators are planning and designing this scale. Network should also consider the convenience of future maintenance. Based on these requirements, we recommend that a network of this size use several ordinary 100M Layer 2 switches to connect to the computer, and all Layer 2 switches are cascaded into the core switch, and in order to meet the fast requirements of Internet speed, we need to purchase Gigabit level Core switch. If the requirements for Internet stability are extremely strict, we can consider using dual-fiber lines of telecommunications and Netcom to access the Internet when conditions permit. network layout According to the above analysis, the networking scheme of this network can adopt the two-layer network structure of the user access layer and the core access layer, and form a unit LAN through the stack connection of ordinary layer 2 switches and core switches to meet the various Internet access requirements of the unit . Ordinary computers are connected to ordinary 100M Layer 2 switches through twisted pairs. Considering the large number of computers, here we can choose 10 24-port Layer 2 switches. All ordinary Layer 2 switches can be connected to gigabit core switches through fiber optic lines or direct-connect cables. To facilitate future management and maintenance of the network, we recommend that core switches and ordinary Layer 2 switches should have VLAN functions and other manageable functions. In this way, we can divide computers located in the same department into the same VLAN, so as to ensure that the Internet access of each department is not interfered by other departments. In order to achieve the purpose of LAN shared Internet access, we also need to use fiber optic cables to connect the core switch to the router device. In order to ensure Internet stability, we can use router devices that support dual WAN ports to allow the unit network to access the telecommunications network at the same time. And Netcom network, in this way, not only can effectively improve the overall speed of LAN Internet access, but also to achieve the role of network load balancing. Of course, in order to further simplify the network topology, we can directly use the gigabit-level core routing switch, instead of buying router equipment separately. For example, the Huawei S8500 gigabit core routing switch is a good choice. The switch can not only achieve the purpose of routing, but also has VLAN settings and other manageable functions, and even has network filtering functions to ensure network security. . Divide address Because there are too many Internet users, if 200 computers are set up in a subnet at the same time, not only the security of the LAN network is not guaranteed, but also the future network management and maintenance efficiency will be affected. To this end, we can divide several computers into different subnets according to the floor or work department, and require different subnets to use different VLANs; considering that computers in different VLANs cannot communicate directly with each other, for this reason We also need to set up routing methods to ensure that each VLAN can communicate with each other, which can greatly improve the transmission stability of LAN network signals. Specifically, even if there is a network failure in a VLAN, the failure will not be affected. The entire unit's local area network has an impact, so that it can effectively reduce the failure loss. Generally speaking, when the number of computers in the domain network exceeds 250, these computers cannot be concentrated in the same subnet, because the maximum number of computers in an IP subnet is 252. After exceeding this number, we It is necessary to divide them into different subnets through the VLAN function of the switch; normally, the number of computers in the same department or the same floor will not exceed 252, at this time we can according to the floor Or different departments, to divide multiple computers located in the same geographical location into the same subnet. For example, for this article, we can divide more than 100 computers distributed in each floor into two different subnets; for example, we can divide all the computers in the first floor into VLAN1 , The IP address in this network segment can be set to 10.176.6.2—10.176.6.254, the gateway address can be set to 10.176.6.1, and the subnet mask address can be set to 255.255.255.0; then we can set all All computers are divided into VLAN 2. The IP address in this network segment can be set to 10.176.8.2—10.176.8.254, the gateway address can be set to 10.176.8.1, and the subnet mask address can be set to 255.255.255.0. In order to allow all computers in the two network segments to share the Internet, we also need to properly configure the two gateway parameters 10.176.6.1 and 10.176.8.1 in the core routing switch or dual WAN port router device to ensure that each sub The computers in the network can access the Internet through the LAN routing function. If we want computers in different network segments to be able to access each other, then we also need to set routing parameters in the core routing switch or dual WAN port router device to ensure that they can use the routing function to communicate with each other. If we do not want to allow computers on different network segments to access each other in the future, we only need to control the routing parameters. Here we need to remind you that even if we modify the routing parameters to achieve the mutual access function of two different network segments, we still cannot find the shared resources located on computers in different subnets through the network neighbor window, but need to open the system The operation dialog box or the address box of the IE browser, enter "\ target computer name or IP address" in it, and click the Enter button to achieve the purpose of cross-network access.
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