This object can be used to over-ride the vNET tag assigned
to the VRF traffic going through this interface. This object is
applicable only if the cvVrfInterfaceType of this interface
has a value of vNETTrunkSI(1).
By default the tagged traffic will use the value denoted by
cvVrfVnetTag of this VRF. In which case this object will
have a value of zero(0).
A set with a value of zero(0) will revert the tag assignment
behaviour to default behaviour mentioned above.