T-ISP-012 · FRR / TI-LFA Backup Path Verifier

Verify Fast-ReRoute / TI-LFA backup path coverage: per-prefix protection status, unprotected prefix list, backup next-hop sanity, and convergence-readiness scoring.

Cisco IOS-XR

Juniper Junos

Arista EOS

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Capabilities

Per-prefix protection status
Unprotected prefix list
TI-LFA backup NH sanity
Coverage % scoring
SRLG-disjointness hint
CSV report

Required inputs

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

Parameter	Type	Default	Notes
Min coverage (%) min_coverage_pct	number	95	—

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (Cisco IOS-XR, Juniper Junos, Arista EOS) so the generated isp & peering logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for Min coverage (%) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can per-prefix protection status and unprotected prefix list. 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

2026-06-15 12:40:00 INFO  PE-rtr-01: 1840/1902 prefixes protected (96.7%)
2026-06-15 12:40:01 WARN  PE-rtr-02: coverage 91.2% (<95%) — 168 unprotected
2026-06-15 12:40:01 INFO  Report written to frr-coverage.csv