DNOS-UDLD-MIB

Description: Manages Unidirectional Link Detection (UDLD) for detecting and disabling one-way links on Dell DNOS switches.

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DNOS-UDLD-MIB is a Dell Networking private MIB that manages Unidirectional Link Detection (UDLD) on switches running Dell's DNOS, a protocol feature that detects and shuts down links only passing traffic in one direction, a common symptom of a faulty fiber pair or transceiver. It exposes global UDLD settings (agentUdldGlobalMode, agentUdldMessageInterval, agentUdldTimeoutInterval) and a per-interface table (agentUdldInterfaceTable) with administrative mode and aggressive-mode settings alongside operational status. From a monitoring perspective, agentUdldInterfaceOperStatus is the key hardware/link-health indicator: it reveals whether a given link has detected a unidirectional fault and been placed into an err-disabled/blocking state, a direct sign of a physical layer (cabling or optics) problem rather than a software configuration change. It builds on the switch's underlying interface/link infrastructure (IF-MIB style ifIndex-based tables) since UDLD operates per physical or logical interface. It is deployed on Dell DNOS switches interconnected by fiber links, particularly in data center and campus core/aggregation layers where mis-wired or degraded fiber pairs must be caught automatically, and network teams can get the DNOS-UDLD-MIB download to load directly into their MIB browser.

An admin polling agentUdldInterfaceTable/agentUdldInterfaceEntry can compare agentUdldInterfaceAdminMode (enabled/disabled) against agentUdldInterfaceOperStatus to find interfaces where UDLD is administratively enabled but operationally reporting a unidirectional fault, indicating a bad fiber strand or mismatched transceiver. Checking agentUdldInterfaceAggresiveMode shows whether the stricter aggressive-mode detection is active on sensitive links. Globally, agentUdldMessageInterval and agentUdldTimeoutInterval reveal how quickly the feature will detect and react to a failure, and agentUdldReset can clear a link's err-disabled state after the physical fault is repaired.

Manages Unidirectional Link Detection Protocol (UDLD) to detect and prevent misconfigurations on Dell switches.