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Chapter 7
Configuring Spanning Tree
This example shows how to configure the port instance priority on an MISTP instance and verify the
configuration:
Console> (enable) set spantree portinstancepri 1/1 16 2
Port 1/1 MISTP Instances 2 using portpri 16.
Port 1/1 mistp-instance 1,3-16 using portpri 32.
Console> (enable)
Enabling an MISTP Instance
You can enable up to 16 MISTP instances. Each MISTP instance defines a unique spanning-tree
topology. MISTP instance 1, the default instance, is enabled by default; however, you must map a VLAN
to it in order for it to be active. You can enable a single MISTP instance, a range of instances, or all
instances at once using the all keyword.
The software does not display the status of an MISTP instance until it has a VLAN with an active port
Note
that is mapped to it.
To enable an MISTP instance, perform this task in privileged mode:
Task
Step 1
Enable an MISTP instance.
Step 2
Verify that the instance is enabled.
Enter the active keyword to display active ports only.
Note
This example shows how to enable an MISTP instance:
Console> (enable) set spantree enable mistp-instance 2
Spantree 2 enabled.
Console> (enable) show spantree mistp-instance 2
Instance 2
Spanning tree mode
Spanning tree type
Spanning tree instance enabled
Mapping VLANs to an MISTP Instance
When you are using MISTP-PVST+ or MISTP on a switch, you must map at least one VLAN to an
MISTP instance in order for MISTP-PVST+ or MISTP to be active. These sections describe how to
configure MISTP instances:
•
•
See
Note
OL-8978-04
Determining MISTP Instances—VLAN Mapping Conflicts, page 7-42
Unmapping VLANs from an MISTP Instance, page 7-44
Chapter 11, "Configuring VLANs"
Command
set spantree enable mistp-instance instance [all]
show spantree mistp-instance [instance] [active]
mod/port
MISTP
ieee
for details on using and configuring VLANs.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring MISTP-PVST+ or MISTP on the Switch
7-41
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