RPVST with VSX guidelines

Path cost is not allowed to be configured on the ISL port.

Layer 2 link connected parallel to ISL link is blocked by RPVST.

Do not configure port-specific spanning tree configurations on 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.

RPVST interoperates with IEEE xSTP BPDU only when VLAN 1 is assigned to a trunk interface or configured with a native VLAN for all layer 2 ports on the RPVST switch. VLAN 1 is assigned to a trunk interface by entering the vlan trunk allowed [<VLAN-LIST> | all] command.

Maximum supported RPVST instances that can be configured.

• 832x series switches: 64

• 8400 series switches: 254