HP AP775A Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2(1) (OL-1 - Page 217
spanning-tree mst simulate pvst
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Chapter 2 Ethernet Commands spanning-tree mst simulate pvst Send comments to [email protected] 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 Release 4.0(0)N1(1a) Modification This command was introduced. 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. OL-16599-01 Cisco Nexus 5000 Series Command Reference 2-69