The VLAN translation is applied in both ingress and
egress sides of the layer 2 trunk on the port. It makes
the traffic arriving on the VLAN with this VLAN ID to
be mapped to or tagged with the corresponding instance
of cvtPortTranslatedVlan on the port. It also
causes all the traffic internally tagged with the
corresponding instance of cvtPortTranslatedVlan and
leaving the trunk port to be tagged with the VLAN of
this VLAN ID.