wlan2 = 5Ghz, auto frequency, 40Mhz Ce, SSID BThis is just so cool! I am one happy MikroTik user!
To be as compatible as possible one usually wants to set (in CAPsMAN) channel width to 20MHz and extension channels to "Ce". This will give you 20/40MHz (auto). Similarly setting width to 20MHz and extension channel to Ceee gives you 20/40/80MHz (auto).
If you set channel width to 40MHz an extension channel to "Ce" you will get 40/80MHz (auto), and some wireless clients may not like this.
Just one question...let's say everything is up and running...and the manager for some reason is rebooted....what happens to the CAP's? Do they keep on running autonomous until the manager returns? Or will all devices stop wlan until the manager is back
That depends on whether you use local forwarding or manager forwarding mode. When using local forwarding mode already connected clients should continue working even if manager goes down, however new associations will not be possible until the manager is back up. When using manager forwarding mode the whole wireless network will not work if the manager is down.