Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2(1) (OL-16599-01, March 2009)

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Cisco Nexus 5000 Series Command Reference
OL-16599-01
Chapter 2 Ethernet Commands
spanning-tree mst simulate pvst
spanning-tree mst simulate pvst
To reenable specific interfaces to automatically interoperate between Multiple Spanning Tree (MST) and
Rapid per VLAN Spanning Tree (Rapid PVST+), use the spanning-tree mst simulate pvst command.
To prevent specific MST interfaces from automatically interoperating with a connecting device running
Rapid PVST+, use the spanning-tree mst simulate pvst disable command. To return specific interfaces
to the default settings that are set globally for the switch, use the no form of this command.
spanning-tree mst simulate pvst
spanning-tree mst simulate pvst disable
no spanning-tree mst simulate pvst
Syntax Description This command has no keywords or arguments.
Command Default Enabled. By default, all interfaces on the switch interoperate seamlessly between MST and Rapid
PVST+. See spanning-tree mst simulate pvst global to change this setting globally.
Command Modes Interface configuration mode
Command History
Usage Guidelines MST interoperates with Rapid PVST+ with no need for user configuration. The PVST simulation feature
enables this seamless interoperability. However, you may want to control the connection between MST
and Rapid PVST+ to protect against accidentally connecting an MST-enabled port to a Rapid
PVST+-enabled port.
When you use the spanning-tree mst simulate pvst disable command, specified MST interfaces that
receive a Rapid PVST+ (SSTP) BPDU move into the STP blocking state. Those interfaces remain in the
inconsistent state until the port stops receiving Rapid PVST+ BPDUs, and then the port resumes the
normal STP transition process.
Note To block automatic MST and Rapid PVST+ interoperability for the entire switch, use no spanning-tree
mst simulate pvst global command.
This command is useful when you want to prevent accidental connection with a device running Rapid
PVST+.
To reenable seamless operation between MST and Rapid PVST+ on specific interfaces, use the
spanning-tree mst simulate pvst command.
Release Modification
4.0(0)N1(1a) This command was introduced.