Diagnose network interface errors

Diagnose link health from counter trends and error analysis

Systematic link troubleshooting before hardware replacement, with trend evidence.

• · show interfaces output
• · counter baseline
• · interval measurement

• · error diagnosis
• · counter trend analysis
• · cable/hardware assessment

• · network device CLI

Device access, baseline captured, second measurement interval recorded

• · Historical counters masked by resets
• · Single-sided measurement misses transceiver issues
• · Parser assumes Cisco format

• · Counter reference table with cause mappings
• · Diagnosis flow with state interpretation
• · Safe parser example with header boundaries
• · Examples of CRC and drop scenarios