Chapter 3 - Advanced STP Tuning

BPDU filter

An STP Feature that filters BPDUs from being advertised/received across the configured port

BPDU Guard

An STP feature that places a port into an ErrDisabled State if a BPDU is received on a portfast-enabled port.

root guard

An STP feature that places a port into an ErrDisabled state if a superior BPDU is received on the configured port.

STP portfast

An STP feature that places a switch port directly into a forwarding state and disables TCN generation for a change in link state.

STP loop guard

An STP feature that prevents a configuration alternative or root port from becoming a designated port toward a downstream switch.

Unidirectional Link Detection (UDLD)

A protocol that provides bidirectional monitoring of fiber-optic cables