per vlan spanning tree plus (PVST+) | STP Modes and Standards
PVST/PVST+ is a Cisco proprietary protocol. Cisco created the STP-based Per VLAN Spanning Tree Plus (PVST+) protocol, which creates one spanning tree instance per VLAN. RPVST+ provided more features than standardized RSTP, including one tree per VLAN. They can use either the Cisco protocol, PVST+, and RPVST+, or the IEEE standard MSTP. Cisco switches let you configure the BID, but only the priority part.
The switch fills in its universal MAC address as the system ID.
It also plugs in the VLAN ID of a VLAN in the 12-bit system ID extension field. The only part configurable by the network engineer is the 4-bit priority field. the configuration command (spanning-tree vlan vlan-id priority x) requires a decimal number between 0 and sixty fife thousand, five hundred and thirty-five (65,535). But not just any number in that range will suffice; it must be a multiple of four thousand ninety-six (4096).
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