[Bug 224961] VLAN ID 0 Not Supported

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224961

            Bug ID: 224961
           Summary: VLAN ID 0 Not Supported
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: johnllyon at gmail.com

Creating a virtual interface with the VLAN ID set to 0 (e.g., em0.0, em1.0,
etc.) is not supported by FreeBSD's vlan implementation.  The issue is that
IEEE 802.1Q specifies that VLAN 0 is "reserved." FreeBSD honors this
reservation because the implementation is standards compliant.  However, in
some instances it would be able to create interfaces on VLAN 0 (e.g., when
wanting to use FreeBSD for a "reserved" purpose).

I understand that standards compliance is the good default design here. 
However, it would be great if there were a sysctl flag that could be set to
allow interfaces on VLAN0.  The default value could be for standards compliant
behavior, thereby allowing users to enable VLAN 0 if desired and they know what
they are doing.

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