Configuring Pvst Simulation Per Port - Cisco Nexus 7000 Series Configuration Manual

Configuring PVST Simulation Per Port

DETAILED STEPS
Command or Action
Step 1
switch# config t
Step 2
switch(config)# no spanning-tree mst
simulate pvst global
Step 3 switch(config)# exit
Step 4 switch# show spanning-tree summary
Step 5 switch# copy running-config startup-config
This example shows how to prevent the device from automatically interoperating with a connecting device
that is running Rapid PVST+:
switch# config t
switch(config)# no spanning-tree mst simulate pvst global
switch(config)# exit
switch#
Configuring PVST Simulation Per Port
Note PVST simulation is enabled by default. By default, all interfaces on the device interoperate between MST
and Rapid PVST+.
You can configure PVST simulation only when you are running MST on the device (Rapid PVST+ is the
default STP mode). MST interoperates with Rapid PVST+. However, to prevent an accidental connection to
a device that does not run MST as the default STP mode, you may want to disable this automatic feature. If
you disable PVST simulation, the MST-enabled port moves to the blocking state once it detects that it is
connected to a Rapid PVST+-enabled port. This port remains in the inconsistent state until the port stops
receiving Rapid PVST+ BPDUs, and then the port resumes the normal STP transition process.
You can block this automatic feature either globally or per port.
Before You Begin
Ensure that you are in the correct VDC (or enter the switchto vdc command).
Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x
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Configuring STP Extensions Using Cisco NX-OS
Purpose
Enters global configuration mode.
Disables all interfaces on the switch from automatically
interoperating with a connected device that is running in Rapid
PVST+ mode. The default for this feature is enabled; by default, all
interfaces on the device operate between Rapid PVST+ and MST.
Exits global configuration mode.
(Optional)
Displays detailed STP information.
(Optional)
Copies the running configuration to the startup configuration.