FEC Statistics Detailed Display

Version 33.7.1 adds per-port Forward Error Correction (FEC) operational statistics for high-speed Ethernet interfaces, providing visibility into FEC health to help diagnose marginal links, optics issues, and cabling problems.

Enhancement: The OS previously displayed only FEC configuration state (enabled/disabled and clause) for high-speed ports such as 25G and 100G. Without operational counters, operators had no way to determine whether FEC was actively correcting errors or whether errors were exceeding correction capability. This enhancement exposes two per-port counters — corrected blocks and uncorrectable blocks — for both Clause 74 (BASE-R/Fire Code) and Clause 91/108 (Reed-Solomon) FEC modes. Counters are 64-bit monotonically increasing values that persist across link bounces and reset when FEC is disabled, when the FEC mode is toggled, or when explicitly cleared.

Key Capabilities:

• Corrected Blocks counter tracks FEC blocks or codewords that contained errors successfully corrected by the FEC decoder; a non-zero value indicates a marginal but functional link
• Uncorrectable Blocks counter tracks FEC blocks or codewords that exceeded correction capability and may result in traffic loss; any non-zero value indicates link degradation
• FEC counters can be cleared independently of other port counters using the new clear counters forward-error-correction command option, or cleared along with all counters via the existing clear counters command
• Ports that do not support FEC display blank counter values to preserve table readability