The method used to replace the Tag Control Information (TCI)
field in all VLAN tagged frames received on the port specified
by the indexing of this entry.
When this is enabled(1), the device will replace the 802.1Q
TCI field with results of the INGRESS stage of frame forwarding.
Logically, this happens immediately prior to the PROGRESS stage
of frame relay.
When this is disabled(2), the device operates in compliance with
the IEEE 802.1Q standard and honors the TCI field of incident
frames.