Cisco supports ISL with a separate STP instance per vlan. That´s PVST.
For 802.1q, Common STP is the Cisco implementation. That´s only one tree although trunks carry n vlans.
STP+ stands for the "merge area" between ISL and dot1q trees, and here we shoud consider that the "boundary" bridge will manipulate BPDUs that arrived in different Layer 2 format and even consider that ISL can see a BPDU for each VLAN but dot1q will only understand BPDUs on VLAN1.
In addition, cat6000 allows Multiple Instance STP. You can create a STP instance, and assign its corresponding VLANS, allowing faster troubleshooting, easier configuration, and reducing redundant BPDU Traffic.
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