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Spanning-Tree loop because one of the links ain't blocked.
I think it's because you've got an access layer switch set with a MAC of 1111.1111.1111 and a default priority, making it the root bridge.
Placement of the root bridge is undesirable.
The correct answer is : Access layer switch will become root and will cause issues/black hole in the network.
Access layer switch will became bridge root。（default priority，lowest MAC address 1111.1111.1111）。And this L2 network will working at low efficiency。