This object indicates how the IEEE 802.1P bits (P bits) in the
IEEE 802.1Q header of the trunk VLAN are to be set. The P bits
in the trunk VLAN can be set by copying the P bits of the
outer PE tag or the inner CE tag.
'copyFromOuterTag' - Copy the P bits from the outer PE tag.
'copyFromInnerTag' - Copy the P bits from the inner CE tag.