Lossless Fabric Config Deployer

Push lossless Ethernet config across an AI DC fabric: PFC per-priority enable, ECN threshold tuning, DSCP-to-queue mapping, RED/WRED disable and per-vendor config generation.

Arista EOS

Cisco NX-OS

NVIDIA Cumulus

Juniper

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Capabilities

Per-vendor config generation
PFC per-priority enable
ECN threshold tuning
DSCP→queue mapping
RED/WRED disable
Pre/post diff validation
Atomic rollback

Required inputs

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

Parameter	Type	Default	Notes
No-drop priority priority	number	3	—
RoCE DSCP dscp	number	26	—
ECN Kmin (KB) kmin_kb	number	150	—
ECN Kmax (KB) kmax_kb	number	1500	—

Hint 1 — Name your vendors and OS versions

Mention the exact platforms you run (Arista EOS, Cisco NX-OS, NVIDIA Cumulus, …) so the generated ai/gpu dc logic uses the right CLI/NETCONF syntax.

Hint 2 — State your real thresholds

Provide concrete values for No-drop priority, RoCE DSCP, ECN Kmin (KB) instead of the defaults — they shape what counts as a fault.

Hint 3 — Prioritize the checks you need

This tool can per-vendor config generation and pFC per-priority enable. 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

[2026-06-12] INFO  Rendering lossless config for 18 devices (3 vendors)...
  arista_eos  → 14 lines  cisco_nxos → 17 lines  cumulus → 11 lines
[DRY-RUN] leaf07 (cisco_nxos): 17 added / 0 removed
[APPLY]   leaf07: pushed · post-check PFC=on ECN=150/1500 OK
Summary: 18/18 rendered · 18 pushed · 0 failures