T-ISP-034 · IRR Prefix-Filter Generator

Resolve an AS-SET via IRR data and render vendor-specific prefix-lists/route-policies for customer and peer sessions, with max-prefix limits and change-diff against the currently applied filter.

Cisco IOS-XR

Juniper Junos

Nokia SR OS

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Capabilities

AS-SET expansion
Per-vendor filter rendering
Max-prefix suggestion
Change-diff vs running filter
IPv4 + IPv6 output
Dry-run preview

Required inputs

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

Parameter	Type	Default	Notes
AS-SET / origin AS as_set	string	AS-EXAMPLE	—
Target vendor vendor	string	iosxr	—

Hint 1 — Name your vendors and OS versions

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

Hint 2 — State your real thresholds

Provide concrete values for AS-SET / origin AS, Target vendor instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can aS-SET expansion and per-vendor filter rendering. 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 18:20:00 INFO  Expanded AS-EXAMPLE -> 412 prefixes (ipv4)
2026-06-15 18:20:01 INFO  Suggested max-prefix: 494 (412 * 1.2)
2026-06-15 18:20:01 INFO  Diff vs running: +18 added, -3 removed
2026-06-15 18:20:01 INFO  Filter written to filter-iosxr.txt