About Troubleshooting Routing Issues
Layer 3 routing involves determining optimal routing paths and packet switching. You can use routing algorithms to calculate the optimal path from the router to a destination. This calculation depends on the algorithm selected, route metrics, and other considerations such as load balancing and alternate path discovery.
Cisco NX-OS supports multiple virtual routing and forwarding (VRF) instances and multiple routing information bases (RIBs) to support multiple address domains. Each VRF is associated with a RIB, and this information is collected by the Forwarding Information Base (FIB).
See the following documents for more information on routing:
Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide
Cisco Nexus 9000 Series NX-OS Multicast Routing Configuration Guide