RPVST with VSX guidelines
Path cost is not allowed to be configured on the ISL port.
Do not configure port-specific spanning tree configurations on the ISL.
Do not have redundant links to the ISL.
Topology changes for VSX LAGs are accounted on the active multichassis LAG role only.
RPVST is supported in both VSX and non-VSX environments.
The common bridge ID continues to be used even after the VSX split brain scenario is identified.
STP configurations on VSX LAG ports must be the same on VSX switches.
To find the maximum supported RPVST instances that can be configured, enter the following command:
show capacities rpvst