You want to mitigate failures that are caused by STP loops that occur before UDLD detects the failure or that are caused by a device that is no longer sending BPDUs. Which mechanism do you use along with UDLD?
Loop guard is a Spanning Tree Protocol (STP) feature that helps prevent the formation of unidirectional link failures and STP loops in the network. It works by monitoring the receipt of BPDUs on non-designated ports. If a designated port stops receiving BPDUs, it assumes that there is a unidirectional link failure and puts the port into a loop-inconsistent state, blocking the port to prevent potential loops.
By enabling loop guard in addition to UDLD, you can further enhance the resilience of the network against STP-related failures. UDLD helps detect unidirectional link failures, while loop guard helps prevent loops in situations where BPDUs are not being received.
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