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The final phase is the Fourth Phase that is Utilizing Redundant Routes.
Eventually, each node only consumes the first received copy, and deletes the second copy of that frame delivered from the other route.
However, the node needs to recognize whether or not it has received that copy so that it can consume the other copy from the second route. For that, each of the connection pair¡¯s nodes establishes a counter for each established selected route. Each node consumes the fastest-received frame as long as the frame is error-free. In other words, if the counter of the faster route is equal to or greater than that of the second route, then the node consumes the frame received from that route and deletes the other copy. Therefore, no duplicated frames are received. However, if the faster route experiences a problem or failure, then its counter stops or at least increases slowly such that it is less than the counter of the second route. In that case, the node consumes the incoming frames from the second route and deletes those of the first route.
This behaviour can be represented in the following expression:
If counter 1 ¡Ã counter 2, then consumes the frames of route 1, else consumes the frames of route 2.
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IEEE/ICACT20210235 Slide.11
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