Core Issue
Both Bridges are in the same role in the radio network.
Resolution
For a connection between two Ethernet Bridges to work, one must be set as a "root" bridge and the other as a "non-root" bridge. Verify that both bridges are not set as root and that both bridges are not set as non-root.
For information on how to verify or configure the role of your bridge, refer to the following documentation:
Problem Type
Device cannot associate
Products
Bridge
What can you ping?
Cannot ping peer