Connect Three DGX Spark in a Ring Topology

1 HR

Connect and set up three DGX Spark devices in a ring topology

Symptom	Cause	Fix
"Network unreachable" errors	Network interfaces not configured	Verify netplan config and `sudo netplan apply`
SSH authentication failures	SSH keys not properly distributed	Re-run `./discover-sparks` and enter passwords
Nodes not visible in cluster	Network connectivity issue	Verify QSFP cable connection, check IP configuration
"APT update" errors (eg. E: The list of sources could not be read.)	APT sources errors, conflicting sources or signing keys	Check APT and Ubuntu documentation to fix the APT sources or keys conflicts