This value specifies the ingress service label. It is used
to identify a remote source bound to the mirror destination
service. This label is obtained manually or through signalling
with the far end.
When tMirrorDestinationRemoteSourceLabelSignaling is set to
'none(1)', this object can take the values 2048..18431. When
tMirrorDestinationRemoteSourceLabelSignaling is set to 'tldp(2)',
this object will have a value of zero. Also, setting this object
will reset signalling to 'none(1)'.