I have several RBs as wireless backhaul servers (ROS 6.7). Typically, I set up both ends as bridge or ap-bridge, using wds-mode=dynamic-mesh, and it works flawlessly.
There is one link that has a habit of failing intermittently, averaging once or twice day, for a half-hour to an hour at a time. During this time, the radios continually associate and then time out. The log shows:
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10:03:15 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: connected, is AP, wants WDS
10:04:11 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: disconnected, management-protection failure
10:04:15 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: connected, is AP, wants WDS
10:05:11 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: disconnected, management-protection failure
10:05:15 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: connected, is AP, wants WDS
10:06:11 wireless,info 00:0C:42:xx:xx:5A@wlan1-TLT: disconnected, management-protection failure
None of the suggestions in the aforementioned thread have worked. I have seen & reported similar issues with the use of WDS in ap-bridge to ap-bridge links (e.g., the packet-storm problem introduced in 5.x and finally resolved in 5.18), so I'm wondering if this could be a similar situation.