Petr over at Internetwork Expert has been writing some great articles related to CCIE field. His Private VLANs post was a great source of information for me and I just saw his latest post on PVST+. I have not worked with spanning tree in great detail and have read a few cisco docs on it but Petr’s explaination beat all of those.
“Cisco switches run different types of STP protocol, depending on whether the connected port is access, ISL trunk or 802.1q trunk. Natively, a Cisco switch runs a separate STP instance for each configured and active VLAN (this is called Per-VLAN Spanning Tree or PVST) and standard IEEE compliant switches run just one instance of STP protocol shared by all VLANs. Due to that, a group of switches running IEEE compatible STP protocol is called MST (Mono Spanning Tree) region.”
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