Allied Telesis UDLD LICENSE GS980MX

Expose and protect against unidirectional fiber or copper link faults by enabling UDLD on Allied Telesis GS980MX switches. UDLD (Unidirectional Link Detection) actively verifies bidirectional connectivity on physical links; when a mismatch or one‑way reception is detected, the switch can flag the port or place it in an errdisable state according to policy. The license (MPN AT-FL-G98MX-UD) unlocks UDLD functionality on supported GS980MX models, giving operations teams deterministic detection for link-level failures that otherwise evade standard monitoring. For enterprise uplinks, stacking or complex fiber topologies, UDLD shortens mean time to detect and isolate asymmetric faults, reducing packet loss and routing flaps. Because the license is a software feature, teams can deploy UDLD selectively to critical aggregation switches, verifying compatibility with existing link‑monitoring and STP configurations prior to rollout.