In your CCNA contemplates, you found out about PortFast and the issue it can cause whenever arranged on an inappropriate port! Reasonable just for switch ports associated straightforwardly to a solitary host, PortFast enables a port running STP to go legitimately from hindering to sending mode.
A Cisco switch will give you an admonition when you design PortFast:
SW1(config)#int quick 0/5
%Warning: portfast should just be empowered on ports associated with a
single host. Associating centers, concentrators, switches, spans, and so forth...
to this interface when portfast is empowered, can cause transitory
crossing over circles. Use with Alert
%Portfast has been designed on FastEthernet0/5 yet will in particular
have impact when the interface is in a non-trunking mode.
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Not exclusively will the switch caution you about the correct use of PortFast, yet you should place the port into access mode before PortFast will produce results.
Presently, you'd feel that would be a sufficient admonition, correct? In any case, there is an opportunity - only a shot - that somebody will figure out how to associate a change to a port running Portfast. That could prompt two significant issues, the first being the development of an exchanging circle. Keep in mind, the explanation we have tuning in and learning modes is to help forestall exchanging circles. The following issue is that there could be another root extension chosen - and it could be a switch that isn't even in your system!
BPDU Gatekeeper ensures against this tragic probability. In the event that any BPDU comes in on a port that is running BPDU Gatekeeper, the port will be closed down and set into blunder incapacitated state, appeared on the switch as fail impaired. A port set in blunder impaired state must be revived physically.
BPDU Gatekeeper is off on all ports of course, and is empowered as appeared here:
SW1(config)#int quick 0/5
SW1(config-if)#spanning-tree bpduguard empower
It's a smart thought to empower BPDU Watchman on any port you're running PortFast on. There's no expense in overhead, and it prevents the plausibility of a switch sending BPDUs into a port designed with PortFast - also the probability of a switch not under your influence turning into a root change to your system!