The value of tMirrorDestinationEnablePortId indicates whether the
port-id of the system is to be included in the mirrored packets.
The value of 'true' indicates that the port-id is to be included in the
mirrored packets.
An 'inconsistentValue' error is returned if an attempt is made to set
the value of tMirrorDestinationEnablePortId to 'true' when
tMirrorDestinationEncapsulation is not set to 'ppp (3)'.