Jan Just Keijser schrieb: > Peter Stuge wrote: >> Look at the spec, Table 9-2 on page 86. (100 in PDF) >> >> VID Use >> 0 "no VLAN identifier is present in the frame" >> 1 "The default PVID value used for classifying frames on ingress .. >> The PVID value of a Port can be changed by management." >> FFF "Reserved for implementation use." > > be careful here (from table 9.2; I actually have an older copy of the > 802.1Q spec): > > The null VLAN ID. Indicates that the tag header contains only priority > information; no VLAN identifier is present in the frame. This VID value > shall not > be configured as a PVID or a member of a VID Set, or configured in any > Filtering > Database entry, or used in any Management operation. > > so it *does* have priority info in it and it is *not* the same as no > VLAN identifier ...
I'm not sure whether you're actually disagreeing with each other... :) "No VLAN identifier" does not mean "there is no 802.1Q header". It just means, that it doesn't represent a VLAN. A frame without a VLAN identifier (i.e. where VID == 0) represents a priority packet. Cheers Fabian
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