This defines the VLAN value on the physical port, or VPLS virtual port, if a change is required to the VLAN value between the VC and the port; its value can be ignored if all port traffic is forwarded to one VC regardless of tagging, in which case the MIB recommends setting it to 4097 to indicate not relevant. This holds the actual VLAN ID involved in whatever tag manipulation cpwVcEnetVlanMode specifies, and an admin auditing configuration should treat 4097 as intentional rather than assuming it is a misconfigured, out-of-range VLAN ID. For example, with vlan mode set to changeVlan, this object would hold the specific target VLAN ID, say 200, the local port's traffic gets remapped to before entering the pseudowire, while a portBased VC on the same platform would correctly show the 4097 placeholder instead.