Dynamic Routing and Clustering
In Individual interface mode, each node runs the routing protocol as a standalone router, and routes are learned by each node independently.
In the above diagram, Router A learns that there are 4 equal-cost paths to Router B, each through a node. ECMP is used to load balance traffic between the 4 paths. Each node picks a different router ID when talking to external routers.
You must configure a cluster pool for the router ID so that each node has a separate router ID.