This read-write TruthValue, defaulting to false, controls whether 802.1Q/802.1p tags are stripped from frames that are being bridged before they are forwarded out; per the description it does not apply to routed traffic. Admins enable this when downstream bridged devices cannot handle VLAN tags and need untagged frames instead. For example, setting the value to true on a bridged segment feeding an older switch that does not understand 802.1Q ensures that switch receives clean, untagged Ethernet frames.