I have an AP122 allowed to work on DFS channels.
Usually AP selects channel 136 because it is the only one transmitting on that channel (0 interferences from other APs nearby).
However, after detecting radar signals AP does not come back to that DFS channel after several days or even weeks. Logs keep saying this: “ah_dcd: wifi: [DFS-dcost] wifi1: Invalid channel 136” after radar signal disappears.
I thought that once radar signals are not detected anymore, AP would come back in a matter of minuter/hours.
Best answer by john_kern
Coming back to this thread, I’ve since stopped using DFS channels, as I’ve been told by GTAC that APs do not perform background scans while on a DFS channel. This means no radio auto power adjustments, or rrm channel changes.