I have two routers with two links between them. Ether1 on both router is Prmary link, ether2 on both router is Backup link, and Ether3 on both router is Customer.
I created bridge on both routers and put all port in them(ether1, ether2, ether3) and set protocol RSTP(master rouer set priority 7000). I also set up port cost(20) for backup ports cost and port priority(90).
Now primary link is root port and backup link is alternate port. When i shuttown primary link, backup link then changes to root port and everything works fine, but when is my primary link full of capacity and lossing packet, then RSTP protocol wont change backup link like root port. Why?