Only one port is selected as DP in a segment.
One switch can have only one root port.
Port opposite to RP can't be in blocking state.
While selecting DP port, root path cost of the switches to root bridge on that segment should be considered.
http://www.youtube.com/watch?v=y-SppCHx1Qs
http://www.omnisecu.com/cisco-certified-network-associate-ccna/what-is-bridge-protocol-data-unit-bpdu-frame.htm
Understanding rstp convergence :
http://swavijay.blogspot.in/2012/05/understanding-rstp-convergence.html
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