Interface Forensics

Real-time interface health scanner: error rate trending, CRC/input error correlation, flap detection, duplex/speed mismatch, LACP bundle integrity, and bandwidth utilisation anomalies.

Cisco IOS/XE/XR/NX-OS

Juniper

Arista

Open in Generator Open in Platform

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Capabilities

CRC & input error rate/sec
Interface flap timeline
Duplex & speed mismatch
LACP/LAG bundle check
Utilisation spike detection
Error-to-traffic correlation
Auto-clear noise threshold

Required inputs

Parameters the script accepts. Defaults shown; some are vendor- or context-gated.

Parameter	Type	Default	Notes
Error rate threshold /s err_rate_threshold	number	10	—
Utilisation alert (%) util_threshold	number	85	—
Flap window (mins) flap_window_mins	number	30	—
Check LACP bundles check_lacp	bool	true	—

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (Cisco IOS/XE/XR/NX-OS, Juniper, Arista, …) so the generated fault logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for Error rate threshold /s, Utilisation alert (%), Flap window (mins) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can cRC & input error rate/sec and interface flap timeline. Ask for the subset relevant to your incident to keep output focused.

Hint 4 — Describe your inventory format

Tell the assistant whether your device list is CSV, YAML, or JSON and which columns it has, so parsing matches your data.

Sample inventory schema

Authoritative shape of the device/policy data this script consumes.

No bundled inventory sample. The script accepts standard device lists (CSV/YAML) with hostname, mgmt IP, vendor, and credentials.

Expected output

Reference terminal output the script should produce — used as a stylistic and structural target.

terminal

[14:30:02] Scanning 1,847 interfaces across 47 devices...

INTERFACE ERROR REPORT — core-rtr-01
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Interface        State  CRC/s  Drop/s  Util%  Issues
Gi0/0/0          up     0      0       45.2   OK
Gi0/0/1          up     142    87      92.1   ← HIGH: CRC=142/s, util=92%
Gi0/0/2          down   -      -        0.0   ← CRITICAL: flapped 4x/30m
Te0/1/0          up     0      12      78.4   WARN: output drops=12/s
Po1 (LACP)       up     -      -       61.2   OK — 2/2 members active