Category Archives: Network Switch

What is the Function of Switch in Networking

Network switches have been an indispensable component in corporate or data center networking. However, faced with the question that what the exact function of switch in networking is, a few people can answer that in a systematic way. In this post, this question is going to be solved.

What Is the Network Switch

The network switch in networking is a small hardware device that can be regarded as a network bridge with multi-ports, centrally addressing communications among all sort of connected devices, like servers, PCs, and access points within one local area network (LAN).

Network Switches in Networking

Figure 1: Network Switches in NetWorking

Types of the Network Switches

As shown in the market, there is a wide range of switches in the market. If you want to figure them out, you should bear in mind with clear criteria. With different standards, types of the switch are matched differently. For example, based on the transmitting rapid, you can get subbranches, like fast Ethernet switch, Gigabit Ethernet switch, 10Gigabit switch, etc. When looking at the configuration options, unmanaged switch and managed switch can be found. In this part, the configuration option will be introduced in details.

Unmanaged Switch

In networking, an unmanaged switch is used to achieve basic connectivity without any configuration interface or options. Just plug them in, they will work. Mostly, they are preferred in small offices and home offices environment or wherever a few ports are needed.

Managed Switch

Comparing with an unmanaged switch, the managed switch, also called smart switches, gives users more flexibility to configure switches as they need. Surely, it brings greater security and targeted networking to users. It supports many management interfaces, like Web UI, CLI, or both. The configuration of VLAN is the common application for a managed switch. For this type, 10gbe switch, 40gbe switch and 100gbe switch are the common choices.

Unmanaged Switch (Left) and Managed Switch (Right)

Figure 2: Unmanaged Switch (Left) and Managed Switch (Right)

The Function of Switch in Networking

No matter in your home or small offices, the network switch seems to be ubiquitous in network applications. For people outside the industry, you may wonder what the switch function is or what the benefits will the network switch brings about. Here, the main function of switch in networking will be listed below:

  • Saving cost. Running cables to industrial Ethernet nodes one by one, it’s a huge cost and even unreliable. Therefore, the switch can be a cost-effective choice in wiring.
  • Easy installation. Without the need for the climate controlled enclosure, switch installation will be easier and more convenient.
  • Low latency. When the transmission of network packet between the source device and target device has low latency, the time will be saved.
  • Eliminating collision. With specified ports of the network switches, the access of the data packet sent by different devices will be spotted faster and targeted transmitted to the matching devices without unnecessary collision.
Front and Back Panel Overview of S5800-8TF12S Fully-Managed Switch

Figure 3: Front and Back Panel Overview of S5800-8TF12S Fully-Managed Switch


As an essential component in network cabling, the function of switch in networking has been highlighted by many users. In this post, the general function of switch has been introduced. If you want to know more about network switches or solutions for network cabling, you can visit FS.COM for professional guidance.

What Is IGMP Snooping and IGMP Snooping Switch?

IGMP snooping switches are gradually entering the core of the network. Maybe some people are still not familiar with the fresh terms such as IGMP snooping, IGMP snooping switch, etc. What is IGMP snooping? What is IGMP snooping switch? All tells in this post.

What Is IGMP Snooping?

IGMP snooping, short for Internet Group Management Protocol Snooping, is a multicast constraint mechanism that runs on layer 2 devices to manage and control multicast groups. As shown in the following figure, this Layer 2 device is usually a data switch. The Layer 2 device (switch) running IGMP snooping analyzes the received IGMP messages and establishes a mapping relationship between the Layer 3 (router) and receivers. Then the layer 2 device (switch) forwards the multicast data according to the mapping relationship. When the layer 2 device (switch) is not running IGMP snooping, the multicast data is broadcast on the second layer. After the layer 2 device (switch) runs IGMP snooping, the multicast data of the multicast group is not broadcast on the second layer but among the known receivers on the second layer.

IGMP Snooping

Enable IGMP Snooping: Before and After

Types of IGMP Snooping

There are two types of IGMP snooping. One is passive and the other is active. The passive mode only parses multicast packets and does not filter packets. The active mode filters out multicast packets that are meaningless to the router. For example, two receivers under the switch using the passive mode are added to the same group, so that there is an entry in the router above the switch. If a receiver wants to leave the group, it sends a leave message to the router. However, even if the router receives the leave message, it does not delete the entry because there is another receiver in the multicast group. Different from the passive mode, the active mode enables the switch to filter out such packets.

What Is IGMP Snooping Switch?

A data switch with IGMP snooping is called an IGMP snooping switch. This kind switch can parse the IGMP packets passing through it and establish a multicast forwarding mapping relationship. In this way, the switch can forward multicast data according to the multicast mapping relationship. If this function is disabled, the switch can only broadcast multicast data. The practical application of IGMP snooping switch is to reduce the processing load caused by receivers on the network receiving unnecessary multicast packets. Most IGMP snooping switches use the active mode, so they can snoop the IGMP messages and leave messages and forward them only when necessary to the connected IGMP routers.


Today, IGMP snooping has become very common and advanced, and the current network supports multicast transmission. Besides, for the convenience and saving the load of the server, using the IGMP snooping switch is required. Although there are some shortcomings, the future of the this kind switch is promised. FS.COM can provide IGMP snooping 10Gbe switch. In addition to this, we also offer the Gigabit Ethernet switch for various ports. If you have any questions or needs about these, please visit