How tinc route traffic when two subnets are identical?

[Bright Zhao]

Hi, All

Two remote tinc nodes(A, B) advertised the same route to the Tinc domain, and the local tinc node(C) has two ConnectTo to point to those two remote nodes, and I found, and let’s assume connection from C to A is better than C to B (better latency from ping) :
1. when two remote nodes are up, the traffic always send through A
2. when A is down, traffic send through B
3. when A recovered, traffic send back to A
4. when B is down, traffic will go through A
5. when B is recovered, traffic not switch to B, instead, still goes on A.

So I would like to know, the underlying mechanism for equal path of Subnet is what? Tinc will test the latency, or something else to make the decision?

BTW, I know if I put weight on the Subnet, it will select by weight, but in my case, same weight.