A service provider's PE router receives the same prefix 10.50.0.0/16 from two different route reflectors, each advertising a distinct next-hop. The network engineer wants the PE to install both paths into the RIB for load balancing. All BGP attributes for both paths are identical up to and including the IGP metric to the next-hop, but by default only one path is being used. Which configuration change enables the PE to install both IBGP paths?