setup Layer 2 LAN interface of the switch as an access port to enter the forwarding state immediately, bypassing the listening and learning states. Use PortFast only when connecting a single end station to a Layer 2 access port.
Provides from three to five seconds convergence after a direct link failure and achieves load balancing between redundant Layer 2 links using uplink groups.
Cuts convergence time by max_age for indirect failure.
BackboneFast is initiated when a root port or blocked port on a network device receives inferior bridge protocol data units (BPDU) from its designated bridge.
Prevents an alternate or root port from becoming designated in the absence of BPDUs. Loop guard helps prevent bridging loops that could occur because of a unidirectional link failure on a point-to-point link.
Secures the root on a specific switch by preventing external switches from becoming roots.
When configured on a PortFast-enabled port, BPDU guard shuts down the port that receives a BPDU.
Unidirectional Link Detection (UDLD):
UDLD monitors the physical configuration of fiber-optic and copper connections and detects when a one-way connection exists. When a unidirectional link is detected, the interface is shut down and the system alerted.