Jun 26, 2012
What is BPDU Guard, PortFast?
PortFast is only configured on End User Access Port.
and only switch/hub/router sends BPDUs
so when a PortFast Port receives a BPDU it will automatically error-disabled the port.
In Spanning Tree Protocol, only root bridge sends BPDUs, but in RSTP all the swtich sends BPDUs and if the swith missed 3 BPDU (2s/6s)the it's consider Dead on the network.
configuration
(config)#spanning-tree portfast
(config)#spanning-tree bpduguard