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Multiple Instance Spanning-Tree Operation
Configuring MSTP
Enabling or Disabling Spanning Tree Operation
This command enables or disables spanning tree operation for any spanning
tree protocol enabled on the switch. Before using this command to enable
spanning tree, ensure that the version you want to use is active on the switch.
Note The convergence time for implementing MSTP changes can be disruptive to
your network. To minimize such disruption, consider using the spanning-tree
pending command (refer to the following section on “Enabling an Entire MST
Region at Once or Exchanging One Region Configuration for Another”).
Enabling an Entire MST Region at Once or
Exchanging One Region Configuration for Another
This operation exchanges the currently active MSTP configuration with the
currently pending MSTP configuration. It enables you to implement a new
MSTP configuration with minimal network disruption or to exchange MSTP
configurations for testing or troubleshooting purposes.
When you configure or reconfigure MSTP, the switch re-calculates the corre-
sponding network paths. This can have a ripple effect throughout your net-
work as adjacent MSTP switches recalculate network paths to support the
configuration changes invoked in a single switch. Although MSTP employs
rapid spanning-tree operation, the convergence time for implementing MSTP
changes can be disruptive to your network. However, by using the spanning-
tree pending feature, you can set up an MSTP on the switch and then invoke
all instances of the new configuration at the same time, instead of one at a time.
Syntax: [no] spanning-tree
Enabling spanning tree with MSTP configured implements
MSTP for all physical ports on the switch, according to the
VLAN groupings for the IST instance and any other configured
instances. Disabling MSTP removes protection against
redundant loops that can significantly slow or halt a network.
This command simply turns spanning tree on or off. It does
not change the existing spanning tree configuration.
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