T-ISP-014 · Inter-AS L3VPN (Option A/B/C) Validator

Validate Inter-AS L3VPN interconnects across Options A/B/C: VRF/RT import-export consistency, VPNv4 label exchange, ASBR next-hop reachability, and end-to-end route presence.

Cisco IOS-XR

Cisco IOS/XE

Juniper Junos

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Capabilities

Option A/B/C aware checks
RT import/export consistency
VPNv4 label exchange audit
ASBR next-hop reachability
End-to-end route presence
Per-VRF summary

Required inputs

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

Parameter	Type	Default	Notes
Inter-AS option (a\|b\|c) option	string	b	—
VRF to validate vrf	string	CUST-A	—

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 Inter-AS option (a|b|c), VRF to validate instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can option A/B/C aware checks and rT import/export consistency. 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 15:05:00 INFO  Validating Inter-AS Option B for VRF CUST-A
2026-06-15 15:05:01 INFO  ASBR-1 ↔ ASBR-2 VPNv4 session Established (label exch ok)
2026-06-15 15:05:01 WARN  RT mismatch: import 100:1 missing on PE-rtr-09