The criteria utilized by switches to choose a port to perform in the backup port function are different in RSTP from STP, making it an improved protocol in contrast to the latter.
As its name implies, the rapid spanning tree protocol (RSTP) allows for a quicker switch to the port-forwarding state. RSTP only has three switchport states: discarding, learning, and forwarding, as opposed to STP's five.
RSTP is an improvement over STP (Spanning Tree Protocol) primarily because it reduces convergence time, or the amount of time it takes for all switches on a network to agree on the topology of the network.
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