The value of sdpBindingPort specifies the port id for
the binding on this SDP.
The value of sdpPwPortOperStatus will be set to 'down' of
all the related SDP pseudo-wire ports, if the SDP
resolves to another port than the one specified here.
An 'inconsistentValue' error is returned when this object
is set to a non-default value when sdpDelivery is set to
'gre'.