Dell-LBD-MIB

Description: Manages Loopback Detection (LBD) to identify and respond to network loops on Dell switches.

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Dell-LBD-MIB is a Dell proprietary MIB managing Loopback Detection (LBD), a switch feature that identifies Ethernet loops on access ports (e.g. from a misconfigured cable or unmanaged switch) and automatically disables the affected port to prevent broadcast storms. It exposes global enable/mode/interval configuration alongside a per-port table showing administrative and operational status of loop detection. Its monitoring purpose is squarely fault detection, tracking which ports have detected a loop and been shut down operationally, a key indicator of a physical wiring or topology fault on the network. It is a self-contained vendor MIB without notable dependency on standard MIBs, though conceptually related to STP loop-guard mechanisms. It is deployed on Dell PowerConnect/Networking access-layer switches to protect against accidental network loops in wiring closets. Engineers can download the Dell-LBD-MIB file directly to load it into their MIB browser.

An operator would poll rlLbdPortTable/rlLbdPortEntry checking rlLbdPortOperStatus against rlLbdPortAdminStatus to find a port that has been automatically shut down by loop detection versus one intentionally disabled, which quickly isolates a mis-cabled port causing a broadcast storm. Global settings rlLbdEnable, rlLbdDetectionInterval, and rlLbdMode let an operator confirm the feature is active fleet-wide and how frequently loop checks run.

Loopback detection configuration MIB for Dell network switches, preventing network loops through port-based detection.