On-board failure logging (OBFL) stores selected diagnostic and environmental information in nonvolatile memory so engineers can investigate a board or module after a failure—even if the device has since recovered. It preserves clues, not a definitive root cause. OBFL is an implementation feature, not a universal logging standard: recorded data, retention, defaults, and commands depend on the hardware and software release.
What OBFL is for
A failure can disappear before anyone can inspect the device: a module may reset, a transient temperature or voltage condition may pass, or a board may be returned for analysis after the event. OBFL is designed to retain selected records across that interval. An engineer can then review what the board reported before or during the incident.
In a 2010 engineering article, Ashish Nagar described an OBFL layer between application software and the operating system. It can read board resources, collect selected values periodically, record events when errors occur, and provide ways to display or retrieve the resulting records. Nagar summarized the motivation this way: “To assist in troubleshooting failures, all board environment variables and failure messages should be logged and stored at the time of a board failure so that the root-cause for the board failure can be determined at a later point in time.” This is the author’s recommendation, not a standards requirement. EE Times, Ashish Nagar, “On-board failure logging (OBFL),” May 19, 2010.
What OBFL can record
There is no required record schema shared by all OBFL implementations. Nagar’s article groups possible records into three broad types; these are a useful way to understand the design, not a mandated format. Cisco manuals show how some of those ideas appear on particular products.
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Baseline records
Baselines capture reference or recent snapshots of board resources, such as sensor readings and permissible limits. Nagar discusses initial, recent, archived, and “golden” reference baselines. Comparing a snapshot with a reference can help show whether a value was unusual, but only if the relevant measurement and limits were recorded.
Event records
Event logging captures occurrences such as correctable or fatal memory errors, temperature excursions, interrupts, and resets. Depending on the implementation, an entry may include a timestamp, sensor or device identifier, error details, failing address, expected data, or applicable limits.
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Software messages and diagnostic context
Message logs may contain alarms, errors, warnings, stack traces, processor or ASIC register dumps, or optional debug traces. Cisco’s Nexus 9000 NX-OS documentation also lists product-specific examples such as initial power-on time, module slot, temperature, firmware and component versions, serial number, crash stack traces, CPU-hog or memory-leak information, exception logs, environmental history, and ASIC statistics or register dumps. The available records depend on the product and release. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 7.x, OBFL chapter.
How to interpret sampling and persistence
OBFL may combine periodic sampling with event-triggered records. Nagar’s 2010 article gives temperature collection once every 30 minutes and voltage collection once every 60 minutes as implementation examples—not universal settings or current best-practice intervals. A periodic sample can establish a trend, while an event-triggered record can capture a condition when it occurs; neither guarantees that every transient will be recorded.
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Nonvolatile storage is what makes post-event review possible, but its capacity and endurance constrain the design. In its documented Nexus 9000 NX-OS Release 7.x context, Cisco says OBFL is enabled by default and warns that flash has a limited number of write and erase cycles; increasing logging consumes that endurance sooner. Those statements apply to the cited guide’s product and software context, not to all devices. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 7.x, OBFL chapter.
How to retrieve OBFL logs
There is no single OBFL command that applies across manufacturers or product families. Use the system-management documentation for the exact device model and software release to identify supported records, commands, access privileges, export options, and retention behavior. Do not apply Cisco CLI instructions to unrelated hardware, or assume that commands for one Cisco family work on another.
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Cisco’s MDS 9000 Series Release 9.x documentation describes module-persistent storage and retrieval for post-mortem analysis. The procedure and records are specific to that product documentation; consult it for the relevant release rather than inferring commands from another platform. Cisco MDS 9000 Series System Management Configuration Guide, Release 9.x, “System Status Monitoring”.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can OBFL diagnose a failed network module?
OBFL can provide evidence that narrows an investigation—for example, a reset record alongside a temperature history, memory error, exception log, or crash trace. It does not independently prove why a module failed. The available records may be incomplete, sampling may miss a short-lived condition, and interpreting a sequence of events still requires the device’s hardware and software context.
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When evaluating an OBFL implementation or planning an investigation, check these details in the applicable product documentation:
Quick Recap
- Which sensors, identifiers, events, software messages, and diagnostic dumps are recorded.
- Which values are sampled periodically and which events trigger immediate records.
- Where records are stored, how much history is retained, and whether added logging affects storage endurance.
- How logs can be viewed or exported, and which privileges are required.
- Which defaults and behaviors apply to the precise device model and software release.
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