IS-IS Topology Analyzer

Full IS-IS diagnostic: LSP database TLV parsing, DIS election verification, overload bit detection, metric consistency audit, SPF tree reconstruction with networkx, and split-brain detection across areas.

cisco-iosxr

juniper

arista

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Capabilities

IS-IS
TLV
SPF
Graph
NetworkX
TLV binary parsing

Required inputs

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

Parameter	Type	Default	Notes
IS-IS Process process	string	1	—
Area Address area	string	49.0001	—

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (cisco-iosxr, juniper, arista) so the generated analysis logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for IS-IS Process, Area Address instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can iS-IS and tLV. 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

[INFO] Loaded 12 IS-IS LSPs across area 49.0001
[OK]   DIS election consistent on all LANs
[WARN] R3: overload bit SET (lifetime 1180s)
[CRIT] R7↔R9: metric mismatch (10 vs 100) — asymmetric routing
[INFO] SPF tree reconstructed: 12 nodes, 23 edges
[OK]   No split-brain detected across L1/L2 boundary