Beacon probing is a networking troubleshooting feature in VMware vSphere that pinpoints failures with physical Ethernet adapters and physical switches.
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The beacon probing function in vSphere detects whether network interface cards in a team can receive and broadcast beacon probes from the host to determine their status. This function can also determine if a physical switch has had a power failure, if a cable has been pulled from a physical switch or if there are failures in downstream switches.