LAN switch configuration and purchase extension Functions

When you go to the market to ask about the price of the switch, you will find that there will be a huge price gap between different models for switches with the same number of ports produced by the same manufacturer. This is because various vendors have developed many extension functions for different types of users.
● Vlanw.ul Lan Virtual Lan
It divides users into different logical groups based on their logical characteristics, and isolates different user groups on the data link layer. For example, the finance department and the engineering department of the company are connected to a switch. They are in a broadcast domain and can communicate with each other, which leads to security issues. Therefore, we can divide these two departments into two different VLANs on the vswitch so that they have their own broadcast domains, thus improving network security.
In the market, the Vlan functions of a switch can be divided into Vlan conforming to the IEEE 802.1Q standard and port-based Vlan. IEEE 802.1Q Vlan supports a maximum of 4096 Vlan groups and can be implemented across switches. A port-based Vlan can only be implemented on one vswitch, and its Vlan information is not carried into other vswitches connected to it.
● Qos
The wide application of voice, video and other multimedia technologies puts forward certain real-time requirements for data transmission. To implement Qos, the switch needs to forward traffic based on the service type. Of course, the service level can be determined based on the user's actual situation.
● Layer-3 routing
Generally, a common switch only works on the data link layer, while a router works on the network layer. A powerful layer-3 switch can work at both the data link layer and the network layer, and forward data packets based on the MAC address or IP address. However, it should be noted that the layer-3 Switch cannot completely replace the router, because it is mainly used for communication between two VLANs in different subnets, rather than for the complex path selection of data transmission.
● Network Management
Network management refers to the centralized management of switches by network administrators through network management programs. The management level supported by a vswitch reflects the manageability and operability of the device. Vswitches with network management function can monitor the traffic of each port, set the speed of each port, and close/open the port connection. By monitoring vswitch ports, you can distinguish network service traffic and quickly define network faults, improving network manageability.
In addition to the features described above, some new vswitches also provide extended functions such as port aggregation, 802.1X authentication, and MAC Address binding.

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