Cisco Labs Configuration of BPDU Guard
1)PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port.
2)When we enable BPDU guard on the switch, spanning tree shuts down PortFast-configured interfaces that receive BPDUs instead of putting them into the spanning tree blocking state.
3)Errdisable is a feature that automatically disables a port on a Cisco Catalyst switch. When a port is error disabled, it is effectively shut down and no traffic is sent or received on that port. The error disabled feature is supported on most Catalyst switches running the Cisco IOS software.
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