AT-UDLD-MIB

Description: Manages Uni-Directional Link Detection (UDLD) protocol configuration and unidirectional fault detection on Allied Telesis switch ports.

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AT-UDLD-MIB is an Allied Telesis private MIB for the Uni-Directional Link Detection (UDLD) protocol, which detects links that appear up at layer one but are only passing traffic in one direction. It would expose per-port UDLD administrative mode, operational/detection state, and neighbor information rather than raw traffic counters. Its role in monitoring is to catch a specific class of hardware/cabling fault - a unidirectional fiber or copper link - that ordinary link-status monitoring cannot see, which is important because such faults can cause spanning-tree loops. It complements Allied Telesis's spanning-tree and link-aggregation MIBs rather than a formal IETF standard. It is typically deployed on fiber uplinks between Allied Telesis switches in campus or data center topologies, where AT-UDLD-MIB SNMP monitoring helps catch unidirectional link faults before they trigger a spanning-tree loop.

No concrete object names were supplied for this MIB, so a specific table/object cannot be cited here. Conceptually, an operator would poll a per-port UDLD table for administrative mode and detected neighbor/link state, and would investigate a port reporting a unidirectional condition as a likely miswired or damaged fiber pair.

UniDirectional Link Detection (UDLD) protocol implementation for Allied Telesis switches.