Re: [Openvpn-devel] [PATCH 4/9] vlan: Prepend and remove VLAN identifiers on outgoing and incoming frames

[Jan J. K. <ja...@ni...>]

Peter Stuge wrote:
> Jan Just Keijser wrote:
>   
>> FYI: 802.1Q defines VLAN 1 as the 'native' LAN: all packets on VLAN 1 
>> are *by definition* not encapsulated (according to my CCNA guide ;-))
>>     
>
> 802.1Q != CCNA..
>
> 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 ...


cheers,

JJK