Does the 2600 allow you to set a static DFS channel? It looks like it might support an auto-switch mode but I can’t find anything specific.
This is a contradiction. The whole point of DFS is "if you detect radar on this frequency you must stop transmitting on it". This is typically followed by a change of channel to avoid an outage of the Wi-Fi, hence "dynamic frequency selection".
As far as I can tell, there isn’t even a way to perform auto DFS selection on my current router.