This object specifies the interface to which the REP edge
should propagate the segment topology change notifications.
The interface should be of type ifType = 'ethernetCsmacd'
or an ethernet based virtual port with ifType = 'propVirtual'.
'0' specifies that the device should not propagate STCNs to
any interface.
This value is only effective on the device acting as the REP
primary edge.