Network redundant link testing

Testing solutions for redundant link networks

With the rapid development of communication technology, network plays a more and more important role in daily work, and Ethernet gradually becomes the communication foundation in various fields.In a real network, accidental failures such as link or communication equipment are often encountered.For some applications requiring high network communication quality, the single link is difficult to meet the reliability requirements of the system, so the redundant scheme of the two links is generally adopted 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 used, but there is a lack of corresponding testing tools to improve the development efficiency and reliability of the system.

Wenzhan Technology launched the WS1008 network damage tester for the dual-link redundant network system.Each instrument contains 12 (24 RJ45 ports) 10/100/1000m adaptive Ethernet links. Ethernet high-speed switches are installed at both ends of each link. The connection and disconnection of real physical links can be simulated through the on-off switch controlled by FPGA.The instrument is controlled remotely by the client, which can effectively and conveniently control the physical opening and closing of each link.The two adjacent links can be primary and secondary links, and the switching time of the primary and secondary links can be measured accurately.It can also cache the data message passing through the link, which is convenient for system debugging and analysis.

Application Scenario 1: Simulate the on-off physical link


Through the client software, the link can be set up to disconnect or connect, simulate the network cable or connector in the link when the fault occurs.When each link is disconnected, the bidirectional data packets sent by the link will be cached by the system and displayed on the client.On - off control is divided into single switch and loop switch.A single switch can realize the link from on to off or from off to off by manually clicking the button, and a cyclic switch can realize the link repeatedly on and off.There are two test modes for cyclic on and off: alternating between primary and secondary links and cyclic off of independent links.

The function of the alternate on-off mode of master and standby links is to automatically switch on and off the selected pair or multiple pairs of master and standby links according to the set on-off time and number of cycles.Contains 6 groups, each group can be independently tested, non-interference.It can be used to test the on-off switching capability of network with redundant links.

Independent link cycle on and off can be used for the periodic on and off test of independent links. The link cycle on and off operation is automatically carried out according to the set time interval and the number of on and off.In this mode, multiple links can also be set into a group, and the operation can be carried out in the unit of the group. The maximum number of two test groups can be supported. Each group can set independent cycle times, link-on-link break time and link-on-link break time.Test the reliability of the system.

Application Scenario 2: Measure the switching time of main and standby links

Choose any two PAIR links. The rules for PAIR links are (1/2), (3/4), (5/6)..., the master/standby link can be set arbitrarily within PAIR link. For example, link 1 and Link 2 can be set as the main 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 point, FPGA timing results are the switching time of primary and secondary links.In this application, when the main link works normally, it is necessary to ensure that there is no valid communication data in the standby link.

The launch of WS1008 effectively solves the problem of efficient simulation of link failures in redundant link systems, as well as the accurate measurement of switching time between primary 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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