This is part of the Cisco Notes series on Mike’s World News.
Spanning-Tree Protocol or STP is IEEE standard 802.1d.
Rapid Spanning-Tree Protocol or RSTP is IEEE standard 802.1w.
The first manufactured switch will be, by default, the root switch in a Spanning Tree. This is because it has the lowest bridge ID (lowest priority plus mac address) is the root switch. If all switches are using the default priority of 32768, then the switch with the lowest MAC address is the root switch.
With Spanning-Tree, LOWER IS ALWAYS BETTER.