Network Interface Health

Use this skill when a network symptom might be caused by a physical link, switch port, cable, transceiver, duplex setting, or congested interface.

When to Use

• A host or VLAN has packet loss, latency spikes, or intermittent reachability.
• A switch or router interface shows CRCs, runts, giants, drops, resets, or flaps.
• You need to compare both ends of a link before replacing hardware.
• A change window needs before/after interface counter evidence.
• Monitoring reports rising ifInErrors, ifOutErrors, or ifOutDiscards.

How It Works

Interface counters are evidence, but the trend matters more than the absolute number. Capture a baseline, wait a measurement interval, capture again, then compare increments.