A、RSTP significantly reduces topology reconverging time after a link failure.

B、RSTP expends the STP port roles by adding the alternate and backup roles.

C、RSTP port atates are blocking，discarding，learing，orforwarding.

D、RSTP also uses the STP proprsal-agreement sequence.

E、RSTP use the same timer-baseed processas STP on point-to-pointlinks.

F、RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.