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When BPDU Guard is enabled globally on a switch it affects all ports that are configured as portfast

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ports. By default

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BPDU Guard is disabled, when you configure BPDU Guard on interface that port doesn't have to be configured

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as a porfast port.

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If a BPDU is received on that port it will be error disabled.

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So BPDU Guard disables a port of any BPDUs received on the port.

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If you configure it BPDU Guard on the port.

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This is very useful

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once again where ports should have PCs connected to them and not another switch. When enabled

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globally on a switch, BPDU Guard prevents problems with portfast ports, portfast should only be enabled

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on access ports connected to user devices and not to switches.

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When BPDU Guard is enabled globally and a port is then configured as a portfast port and it receives

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a BPDU the port is error disabled.