Chapter 5: Switching Commands 327
When PVSTP or rapid PVSTP (PVRSTP) is enabled, MSTP/RSTP/STP is
operationally disabled. To reenable MSTP/RSTP/STP, disable PVSTP/PVRSTP.
By default, FASTPATH has MSTP enabled. In PVSTP or PVRSTP mode,
BPDUs contain per-VLAN information instead of the common spanning-tree
information (MST/RSTP).
PVSTP maintains independent spanning tree information about each configured
VLAN. PVSTP 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 forwarded on some VLANs and blocked on other VLANs.
PVRSTP is based on the IEEE 8012.1w standard. It supports fast convergence
IEEE 802.1D. PVRSTP is compatible with IEEE 802.1D spanning tree. PVRSTP
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 PVRSTP, version 0 STP BPDUs are no longer
transmitted and version 2 PVRSTP BPDUs that carry per-VLAN information are
transmitted on the VLANs enabled for spanning-tree. If a version 0 BPDU is
seen, PVRSTP reverts to sending version 0 BPDUs.
Per VLAN Rapid Spanning Tree Protocol (PVRSTP) embeds support for PVSTP
FastBackbone and FastUplink. There is no provision to enable or disable these
features in PVRSTP.
no spanning-tree
mode
This command globally configures the switch to the default FASTPATH
spanning-tree mode, MSTP.
spanning-tree mst This command sets the Path Cost or Port Priority for this port within the multiple
spanning tree instance or in the common and internal spanning tree. If you
specify an
mstid parameter that corresponds to an existing multiple spanning
Default Disabled
Format
spanning-tree mode {pvst|rapid-pvst}
Mode Global Config
Format
no spanning-tree mode { pvst | rapid-pvst }
Mode Global Configuration
To Next Page
Loading...
