* RSTP defines five port roles: root, designated, alternate, backup, and disabled. Note: RSTP is backward compatible with legacy STP 802.1D. If a RSTP enabled port receives a (legacy) 802.1d BPDU, it will automatically configure itself to behave like a legacy port. It sends and receives 802.1d BPDUs only.

•With RSTP, the With RSTP, the role role of a port is of a port is separated separated from the from the state state of a port. of a port. – For example, a designated port could be in the For example, a designated port could be in the discarding state temporarily, even though its final discarding state temporarily, even though its final state is to be forwarding. state is to be forwarding. The Rapid Spanning Tree Protocol (802.1w) is an evolution of the spanning tree protocol (802.1d). 802.1d reconvergence times are no longer acceptable in present day networks. Rapid Spanning Tree Protocol (RSTP) implements new port states, port roles, and the concept of edge ports and point-to-point links. A. RSTP significantly reduces topology reconvening time after a link failure. B. RSTP expands the STP port roles by adding the alternate and backup roles. C. RSTP port states are blocking, discarding, learning, or forwarding. D. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.