User's Manual

PMP 450 Planning Guide
Data network planning
pmp-0047 (June 2013)
2-51
The 802.1ad S-VLAN is the outer VLAN that is configurable on the Configuration => VLAN web page of the AP.
The Q-in-Q EtherType parameter is configured with a default EtherType of 0x88a8 in addition to four alternate
EtherTypes that can be configured to aid in interoperability with existing networks that use a different EtherType
than the default.
The C-VLAN is the inner VLAN tag, which is the same as 802.1Q. As a top level concept, this operates on the
outermost tag at any given time, either “pushing” a tag on or “popping” a tag off. This means packets will at most
transition from an 802.1Q frame to an 801.ad frame (with a tag “pushed” on) or an untagged 802.1 frame (with the
tag “popped” off. Similarly, for an 802.1ad frame, this can only transition from an 802.1ad frame to an 802.1Q
frame (with the tag “popped” off) since the radio software only supports 2 levels of tags.