Microsecond redundant link switching

A microsecond redundant link switching solution based on FPGA

With the continuous evolution of Ethernet technology, Ethernet has gradually become the basis of communication in


various fields.In a real network, it is inevitable to encounter link or communication equipment failure.For some applications requiring high network communication quality, the redundancy scheme of two links is generally used for communication.In the dual-link redundancy scheme, there are two main links and two standby links. In normal operation, communication is usually carried out through the main link.When the primary link fails, the system will automatically switch to the standby link to continue working.

Dual-link redundant communication scheme has been widely adopted at present. The common dual-redundant link nICS in the market are usually linked together, and the fault is identified and link switched by the operating system and protocol stack.Since software is required to perceive hardware failure and link switching is required at the protocol level, it takes a long time. Generally, the switching time of primary and secondary links declared by manufacturers is 90 milliseconds, that is, the time between the failure of the primary link and the start of the standby link is 90 milliseconds.For a gigabit link, tens of thousands of data messages will be lost in 90 milliseconds, which will seriously affect the normal operation of system services.At the same time, because of the software processing, it is difficult to ensure that each link switch time can reach 90 milliseconds.

In order to improve the switching efficiency of master and standby links, Wenzhan Technology launched WN202 redundant link network card, which is based on FPGA design and adopts innovative network card structure and link switching technology, so that the switching time between master and standby links can be shortened to less than 1 millisecond, greatly improving the reliability of the system. 

WN202 pairs out of four Ethernet ports, in which port 1 and port 2 are redundant links to each other, and port 1 works as the main link under the default boot state.When the main link fails, the board will automatically switch to the standby link without the participation of the host, greatly shortening the switching time and reducing the number of packets lost in the link switching process.In addition to fast switching speed, WN202 also allows users to set link switching conditions, facilitating fast link switching in special application scenarios.

The card is widely used in all kinds of server, computer, industrial control and custom equipment, etc., to support the common operating systems such as Windows and Linux.In addition to the function of redundancy link WN202 has reserved gigabit Ethernet interface, can be used as data encryption or function extension, still can make a customized according to customer requirements development.

The launch of WN202 has changed the high delay and uncontrollability caused by the traditional dual link redundant network card switching link through the operating system, and greatly improved the reliability of the network system, which has been recognized by the majority of customers.


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