T-ISP-021 · Customer Prefix Validation

Validate customer-advertised prefixes against the agreed allow-list and IRR/RPKI: detect bogons, unexpected/more-specific prefixes, and AS-origin mismatches before they reach the route policy.

Cisco IOS-XR

Cisco IOS/XE

Juniper Junos

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Capabilities

Allow-list enforcement
Bogon/private detection
More-specific detection
AS-origin check
IRR/RPKI hint
JSON report

Required inputs

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

Parameter	Type	Default	Notes
Max prefixes max_prefixes	number	100	—
Strict mode (reject extras) strict	string	true	—

Hint 1 — Name your vendors and OS versions

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

Hint 2 — State your real thresholds

Provide concrete values for Max prefixes, Strict mode (reject extras) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can allow-list enforcement and bogon/private detection. 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 14:00:00 INFO  Customer ACME: 42 received prefixes, 40 allow-listed
2026-06-15 14:00:00 WARN  Unexpected prefix 203.0.113.0/24 (not in allow-list)
2026-06-15 14:00:00 WARN  Bogon detected: 10.0.0.0/8
2026-06-15 14:00:00 INFO  Report written to prefix-validation.json (2 violations)