For those who often communicate with network cabling, the technical points of the network switch must be understood. Of course, friends who are interested in network switches can learn more.

A network switch is a network-expanding device that provides more ports in a subnet to connect more computers. With the development of the communication industry and the advancement of national economy information, the network switch market has shown a steady upward trend. It is characterized by high performance and price ratio, high flexibility, relatively simple, and easy to implement.

An Ethernet switch is a network device used for electrical signal forwarding. It provides an exclusive electrical signal path for any two network nodes that access the switch.

A switch (Switch), also called a switching hub, is a MAC-based (Media Card Access Control Address) identification that works on the second layer of the OSI (data link layer, see "Wide Area Network" definition). Packet-enabled network device. It re-generates the information and forwards it to the designated port after internal processing, with automatic addressing and switching. The switch does not know the IP address, but it can "learn" the MAC address and store it in the internal address table. By establishing a temporary switching path between the originator and the target receiver of the data frame, the data frame is directly The source address reaches the destination address. All ports on the switch have exclusive channel bandwidth to ensure fast and efficient data transfer on each port. Because the switch sends each packet independently from the source port to the destination port according to the destination address of the transmitted packet, it does not send to all ports, avoiding conflicts with other ports, so the switch can not affect each other at the same time. The transmission of these packets and the prevention of transmission conflicts increases the actual throughput of the network.

One of the technical points of the network switch

Switch selection points and main technical conditions of ordering

1) Select trusted technical indicators, switching speed, switching capacity (Gbps), backplane bandwidth (Gbps), processing power (Mpps), throughput (Mpps).

2) Design the correct test plan, and prepare enough test ports to accurately evaluate the true performance of the switch.

3) Select the correct product module configuration, adopt distributed switching processing structure, all interface modules have the ability of local autonomous switching, thus avoiding the central switching bottleneck problem existing in the centralized switching structure.

4) Delay and delay jitter, using industry-leading switches with a delay of less than 10 microseconds.

5) For multicast support, common multicast protocols include PIM and DVMRP. The product should support both multicast protocols.

6) A variety of interface types, choose a backbone switch that supports both Gigabit Ethernet, POS, and ATM broadband interfaces.

7) Stable routing protocol software implementation, the need for routing protocols (such as BGP, OSPF) that can be implemented on the switch.

8) Support MPLS. The backbone network that can be built with MPLS can support various applications such as traffic engineering and VPN.

9) The main technical conditions for the ordering of the switch are to choose a large amount of network data transmission, strong data exchange capability, stable and reliable, and non-stop operation. Choose products based on high performance, manageability, reliability, suitability and price/performance.

10) The switch size of the main room should be installed in the main cabinet.

The main specifications and parameters of the switch are 8, 16, 24 RJ45 ports, rack-type 19-inch adaptive Ethernet switches, support network standard 802.3 10BaseT, 802.3u100BaseTX, backplane bandwidth: 4.8G packet forwarding rate 10M: 14,880pps; 100M : 148,800 pps 10M/100Mbps MAC address table 4K. In addition, there are smart and fiber-optic switches, depending on the network.

11) The family generally has four ports, and multiple ports are used for enterprises.

12) There are many models and functions at present, and the grades are different! Commonly used general electronics market can be purchased!

13. The switch cannot be applied to adsl dialing. The telephone line cannot use the switch. The switch does not have the function of assigning an ip address. The router can automatically assign ip.

The technical points of the network switch

Job characteristics

1. The network segment adjacent to each port of the AC is a self-defense collision domain.

2. The equipment adjacent to the AC is still in a wide area, that is, the AC does not stop the distance broadcast (the only exception is in the case of a VLAN).

3. The AC machine looks at the spleen according to the information of the frame header. It means that the AC machine is a collection device working at the data link layer (the AC machine here refers only to the traditional Layer 2 communication device).

The understanding of the technical points of the network switch helps the relevant staff to do their job well in the corresponding field and improve their relevant knowledge.

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