What is a four-layer switch? What are the functions of the four-layer switch?


The switch is one of the necessary devices for networking. The switch connects to each LAN. The switch plays an increasingly important role in network construction. Now that the switch has been developed to a four-layer switch , what is the fourth layer? switch? What are the functions of the four-layer switch? Let's take a look at the decoration home decoration network Xiaobian.

四层交换机

What is a four-layer switch?

The four-layer switch has a common name in the industry called "application switch", which is a function that determines the transmission not only based on the MAC address (the second layer bridge ) or the source / destination IP address (the third layer route ) , but also The port number is applied according to TCP/UDP ( layer 4 ) . The first four switching function like a virtual IP, to the physical servers. The services it transmits are subject to a variety of protocols, including HTTP , FTP , NFS , Telnet, or other protocols.

四层交换机功能

What are the functions of the four-layer switch?

1. Packet filtering: On the traditional router, the fourth layer information port number is used to define the access control list filtering rule. Layer 4 switching also borrows the concept of a control list, but unlike software-based routers, Layer 4 switching is implemented in ASIC- specific high-speed chips, allowing filtering control to be done at wire speed.

2. Quality of Service: The fourth layer of TCP/UDP information can also be used to establish the priority of application communication. Layer 4 switching allows the use of port-based numbers (applications) to prioritize and prioritize queues to ensure that critical traffic (eg, VOIP , video) is processed the fastest, enabling emergency applications to obtain high-level services from the network.

3. Load balancing: The principle of the fourth layer switching load balancing is to exchange the virtual connection according to the IP address and the TCP port, and directly send the data packet to the corresponding port of the destination computer. A switch with Layer 4 switching capability can be used as a hardware load balancer to load balance servers.

4. Host standby connection: The host standby connection provides a redundant connection for the port device, which effectively protects the system when the switch fails. This service allows the definition of the active and standby switches. They have the same configuration parameters as the virtual server definition. The master switch continuously informs the backup switch of Layer 4 about the data, MAC data, and its power state. When the primary switch fails, the backup switch automatically takes over without interrupting the conversation or connection.

5. Statistics and Reports: The Layer 4 switch can provide more detailed statistical records by querying the fourth layer of data packets. Because the administrator can collect more detailed information about which IP address is communicating, it can even collect communication information according to which application layer service is involved in the communication.

The above is what Xiaobian brought to you. What is a four-layer switch? What are the functions of the four-layer switch? I believe that everyone has a basic understanding of the four-layer switch function after reading this article. If you want to know more about decoration consultation, please click to enter the decoration knowledge channel .


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What is the principle of the switch? The working principle of the switch

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What is a telephone exchange? What are the functions of the telephone exchange?

What is a poe switch? What is the power of the poe switch?

What is a Layer 3 switch? Which layers does the Layer 3 switch mean?

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