This object indicates the encapsulation type of the L2VC associated with the gmac trace.
The value of this object can be:
invalid: indicates that no display shows that the L2VC is associated
with the current gmac trace.
l2vcRaw: indicates that the VLAN tag is not encapsulated into the packet.
l2vcTagged: indicates that the VLAN tag is encapsulated into the packet.
By default, the value is invalid.