Administrator Guide

Layer 2 Switching Commands 768
RSTP-PV maintains independent spanning tree information about each
configured VLAN. RSTP-PV uses IEEE 802.1Q trunking and allows a trunked
VLAN to maintain blocked or forwarding state per port on a per VLAN basis.
This allows a trunk port to be forwarding for some VLANs and blocked on
other VLANs.
RSTP-PV extends the IEEE 802.1w standard. It supports faster convergence
than IEEE 802.1D. RSTP-PV is compatible with IEEE 802.1D spanning tree.
RSTP-PV sends BPDUs on all ports instead of only the root bridge sending
BPDUs and supports the discarding, learning, and forwarding states.
When the mode is changed to rapid-pvst, version 0 STP BPDUs are no longer
transmitted and version 2 RSTP-PV BPDUs that carry per-VLAN information
are transmitted on the VLANs enabled for spanning-tree. If a version 0 BPDU
is seen, RSTP-PV reverts to sending version 0 BPDUs.
RSTP-PV embeds support for STP-PV Indirect Link Rapid Convergence and
Direct Link Rapid Convergence. There is no provision to enable or disable
these features in RSTP-PV.
Example
The following example configures the spanning-tree protocol to MSTP.
console(config)#spanning-tree mode mst
spanning-tree mst configuration
Use the spanning-tree mst configuration command in Global Configuration
mode to enable configuring an MST region by entering the multiple
spanning-tree (MST) mode.
Syntax
spanning-tree mst configuration
Default Configuration
This command has no default configuration.
Command Mode
Global Configuration mode