So the 2 cases I mentioned are correct, but additionally there are 2 other ones:
3) when R2 receives from R1 the route with metric 16, but it receives as well the same route from another router R3 with a metric M3 different from 16, the router R2 will advertise back to R1 the route with metric M3+1.
4) when R2 receives from R1 the route with metric 16, and it doesn't receive the same route with a metric strictly lower than 15 from any another router, the router R2 will advertise back to R1 the route with metric 16.
And only this last case 4) is the one associated to poison reverse.
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