Besides addresses, what does the subnet manager program in switches?
Why D is the answer
Forwarding tables
The SM calculates and sets routes.
In detail
- The SM calculates routes and programs them.
- Routes change as the fabric changes.
Use case
An illustrative scenario, not a real incident.
The subnet manager calculates routes, and it programs forwarding tables in switches.
See it in different ways
flowchart LR A["Discover fabric"] --> B["Assign LIDs"] B --> C["Program routing tables"] C --> D["Ports go Active"] D --> E["Standby SM takes over on failure"]
stateDiagram-v2 [*] --> Down Down --> Initializing: link comes up Initializing --> Armed: SM assigns a LID Armed --> Active: SM finishes the configuration Active --> [*]
flowchart LR S0["Discover fabric"] --> S1["Assign LIDs"] --> S2["Calculate routes"] --> S3["Program switches"]
Key point: The SM programs forwarding tables.
Why the other options are wrong
- A. BIOS passwords
- That is a server setting.
- B. Slurm partitions for GPU jobs
- That is a scheduler setting.
- C. GPU clocks
- That is a GPU setting.