Configuring Multicast (MRIB)
The Cisco NX-OS IPv4 Multicast Routing Information Base (MRIB) is a repository for route information that is generated by multicast protocols such as PIM and IGMP. The MRIB does not affect the route information itself. The MRIB maintains independent route information for each virtual routing and forwarding (VRF) instance.
For more information, see the Cisco Nexus 9000 Series NX-OS Multicast Routing Configuration Guide, Release 7.x.