usdPimMRouteRouteAddr 1.3.6.1.4.1.4874.2.2.43.1.1.12.1.16

The address of the route being used to do RPF check for this entry. It is set to 0.0.0.0 (with usdPimMRouteRouteMask set to 255.255.255.255) if there is no route available.