SMC Networks 2555W-AG2 User Manual page 78

6
System Configuration
Spanning Tree Protocol – STP uses a distributed algorithm to select a bridging
device (STP-compliant switch, bridge or router) that serves as the root of the
spanning tree network. It selects a root port on each bridging device (except for the
root device) which incurs the lowest path cost when forwarding a packet from that
device to the root device. Then it selects a designated bridging device from each
LAN which incurs the lowest path cost when forwarding a packet from that LAN to
the root device. All ports connected to designated bridging devices are assigned as
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