i use the topology for test stp tcn_bpdu: sw_1 (root bridge) | |<port1:root port> sw_2 |<port2:designated port> | --------pc sw_2's port1 is root port. sw_2...

the stp construct a static topology.can anybody tell me some tech aboutdynamic method which according user application demands? i know,this question is a bud in my head.and,this quesiton perharps is no a question.

0.does span have any standard ,like ip's is rfc791？1.if i use a low bandwith port to monitor a high port ,what result i will get?2.how dose span influence the mathcine perfomance?