To the original question, after Channel Optimization gives the best bi-directional
throughput channel choice, the link channel remains static. Changing a Root
Bridge channel, will cause drops/packet loss for traffic across the bridge links,
is why the 7731 does not change channels (with Channelfly or Background scan).
In extremely challenging environments, you may need to run Chano from time to
time if the throughput appears to be less than it was.