Enclosed is rather straightforward diagram of square network design.
R-1 - R-2
R-3 - R-4
Note: Please ignore the dots, since blanks/spaces are being removed.
OSPF is running on all interfaces with only one line "network ... 0.0.0.3 ...".
Question: If link between R2 and R4 fails, ping from R1 to R4 is going through R2 instead of R3. Also, I have two equal routes on R1 for R2/R4 subnet, no matter what's happening with the R2/R4 link?