Is dot1.x supported in all models of routerboard?
If not Which models support this protocol?
I can’t say for sure, but I think I remember seeing in changelog that they removed dot1x from smips version to save space.
So can we say that after updating all mipsbe routers
dot1x will be added.?
If you don’t require legally binding answer, then yes. Otherwise “probably”, because I haven’t seen all. If you have the devices, just try it, it’s the simplest way.