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High speed switching redundant network card

FPGA - based redundant link high speed switching solution


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With the continuous evolution of Ethernet technology, Ethernet has gradually become the basis of communication in various fields.In the actual network, the link or communication equipment will often encounter occasional failures.For some applications that require high quality of network communication, the redundancy scheme of double link is generally adopted for communication.In the scheme of dual link redundancy, there are two main links and two standby links.When the main link fails, the system automatically switches to the standby link to continue working.


The dual-link redundant communication scheme has been widely adopted at present, and the common dual-link network card in the market is generally through the link binding, fault identification and link switching by the operating system and protocol stack.It takes a long time because the software needs to perceive the failure of the hardware and do link switching on the upper layer. The switching time between the main link and the standby link declared by the general manufacturer is 90 milliseconds, that is, the time between the failure of the main link and the start-up of the standby link is 90 milliseconds.For a gigabit link, tens of thousands of data packets will be lost in 90 milliseconds, which will seriously affect the normal operation of the system.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 the main and backup links, wenzhan technology has launched the WN204 high-speed switching redundant network card. Based on the FPGA design, this network card adopts innovative technology to shorten the switching time of the main and backup links to less than 1 millisecond and greatly improve the reliability of the system. 


WN204 pairs of outgoing 4 Ethernet ports are divided into 2 independent double redundant links, each group is 1+1 hot backup.When the main link fails, the board will automatically switch to the standby link without the participation of the host, which greatly shortens the switching time and reduces the number of packet loss in the link switching process.The network card is widely used in a variety of servers, computers, industrial PC and custom equipment, support Windows and Linux and other common operating systems.2 gigabit Ethernet interfaces are reserved between the network card and the host, which can be used for data encryption or function expansion, and customized development can be made according to customer requirements.


The launch of WN204 has changed the high delay and uncontrollability generated by the traditional double-link redundant network card switching links through the operating system, greatly improved the reliability of the network system and won the recognition of the majority of customers.

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