BPDU Guard
A switch port with PortFast configured detects and shuts down the switch port if it detects an incoming BPDU frame
BPDU Filter
A switch port with PortFast configured detects and ignores the switch
port if there is incoming BPDU frame to the switch port
Unlike
BPDU Guard feature, BPDU Filter feature does not shutdown the switch
port. However you may need to reset the switch ports (issue shut and no
shut on the switch port) in order to "revive" the switch port condition
after BPDU frame is received on such switch port.
Root Guard
A switch port configured with Root Guard will never
become a Root Port. You might need this feature when the switch port should never become a Root Port, for example when a switch port connects to
host or edge port, or possibly a switch port with low bandwidth.
Loop Guard and UDLD
As the name implies, Loop Guard feature sets the switch port to detect potential loop due to inactive UDLD.
More Info: Spanning-Tree Protocol Enhancements using Loop Guard and BPDU Skew Detection Features
More Info: Loop Guard versus UDLD
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