This attribute specifies the RIP learned routes to which this export policy
applies, based on the RIP interface from which the routes are learned.
This attribute can only be non zero when the protocol is set to rip. The
value of 0.0.0.0 implies any RIP interface on the same virtual router;
otherwise the value of this attribute must match the interface address of
a LogicalIf that has a RipIf on the same virtual router.