What Is Bpduguard Errdisable?
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BPduguard Errdisable is a feature found on Cisco switches that automatically shuts down an interface when a BPDU (Bridge Protocol Data Unit) is detected. BPDUs are used by switches to detect loops in a network and this feature helps to prevent unauthorized devices from connecting to the network. When a BPDU is detected, the switch will automatically disable the port and alert the administrator, preventing any malicious devices from having access to the network.