Nick Suan via NANOG writes:
> I was actually interested to see if the EX series would let me do this, and i
> t turns out that if STP is enabled on any of the switch interfaces, it won't:
> tevruden@core-02# commit check
> [edit protocols rstp]
>   'interface'
>     XSTP : Interface ge-0/0/0.0 is not enabled for Ethernet Switching
> error: configuration check-out failed

Do you have any rstp-specific overrides in your config? E.g. we
have things like this in some of ours:

  rstp {
      interface ge-0/0/45 {
          cost 1000;
          mode point-to-point;
      }
      interface ge-1/0/45 {
          cost 1000;
          mode point-to-point;
      }
      interface ae4;
      bpdu-block-on-edge;
  }

With the interfaces gone I would expect the commit check to fail.

--lyndon