HCIA load balancing and solution of packet by stream problem

tesingxxx

The most basic load balancing experiment is as follows:In this way, PC1 goes through two paths through R1 and finally arrives at PC2. Here, two static routes are configured with the same priority. By default, he chooses to go through R3, so the priority of the two paths is the same. Whether R3 is selected because I check the five tuples written in the data and then hash it for encryption, what is the algorithm, and why R3 is selected for the two results, The most important thing is that after R1 is down and R3 is connected, it can‘t be pinged directly. How to solve this problem