NVSwitch SXid: Severity, Topology and Recovery Scope
Interpret NVSwitch SXid severity and affected ports before recovery. Distinguish legacy Fabric Manager reporting from B200/B300 NVSDM telemetry.
On platforms using legacy SXid reporting, the full severity and affected port determine impact. Fatal GPU-facing and baseboard-facing faults can have different scopes. NVIDIA states that this SXid model does not apply to DGX/HGX B200/B300 systems, which use NVSDM-based switch telemetry.
- Root cause
- Unconfirmed until the event family, topology and preceding fabric evidence identify the affected path.
- Recommended fix
- Ask the operator to isolate the affected workload and follow the generation-specific vendor workflow.
- How Denpex helps
- Denpex investigates NVSwitch SXid: Severity, Topology and Recovery Scope using the evidence you provide or your connected workload collects. Earlier rank, host or application evidence is needed to distinguish an initiating failure from a downstream report.
What this failure is
Topology-aware interpretation of NVSwitch events on platforms that actually use the cited SXid reporting model.
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Why it happens (the mechanism)
A switch event describes an affected fabric path. A propagated GPU Xid or aborted job does not prove the GPU initiated the fault, and recovery scope depends on the port and partition.
What you'll observe
- GPU jobs fail or stop progressing while switch or Fabric Manager events are reported.
Common symptoms and what they mean
Check possible explanations against the incident evidence. A matching symptom alone does not establish its cause.
| Symptom | Possible explanation |
|---|---|
| An nvidia-nvswitch SXid line with fatal/non-fatal classification and a link identifier | Unconfirmed until the event family, topology and preceding fabric evidence identify the affected path. |
Which systems are affected
- NVSwitch systems covered by the legacy SXid section of their Fabric Manager guide; not a universal Blackwell reporting model
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Record system generation and management stack before applying an SXid runbook.
- ✓Preserve the entire switch message, severity, port identity and Fabric Manager logs; map GPU-facing versus inter-baseboard paths.
- ✓Correlate affected partitions and propagated GPU events. Non-fatal does not guarantee unchanged performance.
Root cause
- Unconfirmed until the event family, topology and preceding fabric evidence identify the affected path.
The fix and how to prevent it
The fix and the prevention pattern
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Why the recommended fix works
Correct event and topology scope prevents a switch fault from being misattributed to a GPU and avoids applying an incompatible reset procedure.
Diagnose this failure in VS Code
Select the traceback or open the failed terminal, then run Denpex locally to inspect matched failure patterns, supporting evidence and next checks without uploading the log. Verify recommendations against your workload before changing production.
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Frequently asked questions
Questions engineers and on-call staff commonly ask about this failure.
Should the same SXid runbook be used on B200?
Don't just read the fix, diagnose your run
The encyclopedia explains documented failure patterns. Denpex investigates your logs, configuration and stack, shows the supporting evidence, and asks for missing details when needed.