An InfiniBand (IB) Router connects two or more InfiniBand subnets , making it possible for nodes in different subnets to communicate through route-managed communication .
From the official NVIDIA InfiniBand Routers Documentation :
"An InfiniBand router provides connectivity between two or more InfiniBand subnets, enabling communication between hosts that are not on the same subnet while preserving isolation and scalability."
Ensures fabric scalability by allowing subnet segmentation.
Uses LID routing across subnet managers (SMs).
Essential in large clusters with thousands of nodes.
Incorrect Options:
A and B are incorrect: InfiniBand does not connect directly to Ethernet or SANs without a gateway.
C is unrelated: NVLink is a GPU interconnect, not tied to InfiniBand routers.
[Reference: NVIDIA InfiniBand Routers Guide, ]
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