RSTP speeds Network convergence by having three port states:
With normal STP, the ports goes through 5 states in order to be in forwarding STP state:
Enhanced RSTP features are:
1- Alternate port
2- Backup port.
Alternate and Backup Port Roles:
These two port roles correspond to the blocking state of 802.1D. A blocked port is defined as not being the designated or root port. A blocked port receives a more useful BPDU than the one it sends out on its segment. Remember that a port absolutely needs to receive BPDUs in order to stay blocked. RSTP introduces these two roles for this purpose
please refer to the bellow link for more info about RSTP 802.1 w:
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