Network redundant link test

A test solution for redundant link networks


With the rapid development of communication technology, network plays an increasingly important role in daily work, and Ethernet has gradually become the basis of communication in various fields.In the actual network, it often encounters the link or the communication equipment and so on occurrence accident breakdown.For some applications with higher requirements of network communication quality, single link is difficult to meet the requirements of system reliability, so the redundancy scheme of double link is generally adopted for communication.In the double-link redundancy scheme, there are two links, the primary link and the secondary link.When the main link fails, the system will automatically switch to the standby link to continue working.Dual-link redundant communication scheme has been widely used, but there is no corresponding testing tool to improve the development efficiency and reliability of the system.

Aiming at dual link redundant network system, WS1008 network damage tester was introduced by wenzhan technology.The instrument adopts FPGA+CPU system architecture. Each instrument contains 12 (24 RJ45 ports) 10/100/1000m adaptive Ethernet links, and both ends of each link have Ethernet high-speed switches. The switching on and off controlled by FPGA can simulate the connection and disconnect of real physical links.The instrument can control the physical opening and closing of each link efficiently and conveniently through the remote control of the client.The two adjacent links can be connected to each other, and the switching time of the two links can be accurately measured.It can also cache the data message passing the link, which is convenient for system debugging and analysis.

Application scenario 1: simulate the opening and closing of physical links


Through the client software, the link can be set up to be disconnected or connected.When each link is disconnected, the last two-way data packets sent by the link will be cached by the system and can be displayed on the client side.On - off control is divided into single switching and cycle switching. Single switching can realize link switching from on to off or from off to on by manually clicking the button, and loop switching can realize link switching repeatedly.There are two test modes: alternating on and off of primary and secondary links and cyclic on and off of independent links.

The function of alternate switching on and off of the main and backup links is to automatically switch on and off the main and backup links of the selected pair or pairs according to the set switching time and cycle times.Contains 6 groups, each group can be independently tested, without interference.It can be used to test the on-off switching capability of network with redundant links.

The cycle on and off of independent link can be used for the cycle on and off test of independent link.In this mode, multiple links can also be set as a group, which can be operated as a unit and support up to 2 test groups. Each group can set independent cycle times, link-on to link-off time, and link-off to link-on time.Realize the system reliability test.

Application scenario 2: measure the switching time of main and secondary links

Choose any two PAIR links. The rules for PAIR links are (1/2), (3/4), (5/6)..., the primary/secondary link can be set arbitrarily within the PAIR link. For example, link 1 or link 2 can be set as the primary link.Click on the corresponding main link of the main switch button, the instrument will be closed by a FPGA high-speed switch at the ends of the main link (tens of nanoseconds), within the FPGA start timing at the same time, monitoring the corresponding backup link, when the direction of one of the backup link to receive the broadcast packet packets correctly, that the backup link has normal work.At this time, FPGA timing results are the switching time of primary and secondary links.When the main link works normally in this application, it is necessary to ensure that there is no valid communication data in the standby link.

The launch of WS1008 effectively solves the efficient simulation of link faults in redundant link systems, as well as the accurate measurement of switching time between main and secondary links.It greatly improves the development and debugging efficiency of r&d personnel, provides effective support for optimizing the automatic switching time of primary and secondary links, and greatly improves the reliability of redundant link network system.


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