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Subject: Re: vlan id 0
From: "Danny J. Mitzel" <mitzel@acm.org>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>,
 Tony Moseby <tsmoseby@yahoo.no>
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  On Sat, Sep 27, 2014 at 4:44 PM, Adrian Chadd wrote:
  > .. the spec allows vlan id=0?

0 is not a valid VLAN ID but the specs do allow it
in a tagged packet, it's called "Priority tagged".
The priority bits should be interpreted when making
any queuing / scheduling decisions during forwarding.
The VLAN ID bits are ignored and packet is to be
treated as untagged during forwarding / flooding
decisions.