EVPN/VXLAN Fabric Verifier

Datacenter fabric integrity check: VTEP discovery, NVE peer state, EVPN type-2/3/5 route audit, VNI↔VLAN mapping consistency, ARP suppression cache drift, and silent-host detection across leaf/spine.

Cisco NX-OS

Arista EOS

Juniper QFX

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Capabilities

VTEP/NVE peer matrix
EVPN type-2 MAC/IP audit
Type-3 IMET completeness
Type-5 prefix leak check
VNI↔VLAN consistency
ARP suppression drift
Silent host detector
Underlay (BGP-EVPN) health

Required inputs

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

Parameter	Type	Default	Notes
Expected VTEP count expected_vteps	number	16	Nokia SR-OS NVE deployments validated for 2–128 VTEPs in this template.
VNI range (start-end) vni_range	string	10000-19999	—
Silent host threshold (m) silent_host_mins	number	30	Silent-host detection depends on BGP-EVPN underlay scrape.
Verify BGP-EVPN underlay check_underlay	bool	true	—
MAC move alert (per hr) mac_move_thresh	number	5	Large fabrics (≥64 VTEPs) generate more legitimate MAC moves — minimum threshold raised to 10/hr.

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (Cisco NX-OS, Arista EOS, Juniper QFX) so the generated fault logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for Expected VTEP count, VNI range (start-end), Silent host threshold (m) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can vTEP/NVE peer matrix and eVPN type-2 MAC/IP audit. 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.

fabric.yaml

yaml

4 spines × 16 leaves (mixed NX-OS + EOS), L2/L3 VNIs, anycast GW, ARP suppression

yaml

# Leaf/spine fabric — 4 spines, 16 leaves (Cisco NX-OS + Arista mix)
fabric:
  asn_underlay: 65100
  asn_overlay: 65101

Expected output

Reference terminal output the script should produce — used as a stylistic and structural target.

terminal

EVPN/VXLAN FABRIC AUDIT — 16 leaves, 4 spines
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

VTEP DISCOVERY:
  Expected: 16   Discovered: 15   ← MISSING 1 VTEP
  Missing:  leaf-07 (10.255.0.107) — last seen 00:42:18 ago

NVE PEER MATRIX (sample leaf-01):
  Peer VTEP        State     Uptime      Routes  Type-3
  10.255.0.102     Up        14d 06h     247     ✓