On Fri, Dec 11, 2020, at 21:44, Paul Bone wrote: > network providers that their CPEs need to support vlan ID 0. > > Can anyone advise why this is done over just adding vlan tags and > 802.1p priorities upon ingress into the OAN providers network?
VLAN ID 0 is supposed to mean "802.1p for unatgged/unknown VLAN ID/native VLAN". (802.1p bits are part of the 802.1q header, along with the VLAN ID). It may also be interpreted as "tagged unknown" or "tagged native vlan" (when 802.1p is not required). It is in the standard for at least 15 ans, so your favorite CPE vendor has no excuse for not implementing it. However, when it does, it may use a different way of specifying it (like "priority-tagged" or "encap 802.1p"). -- R.-A.F.
