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Chapter 7
Configuring Spanning Tree
To configure the port instance priority for a port, perform this task in privileged mode:
Task
Configure the port instance priority on a MISTP
instance.
This example shows how to change the port instance priority on a port and verify the configuration:
Console> (enable) set spantree portinstancepri 2/12 10 2
Port 2/12 instances 2 using portpri 10.
Port 2/12 mistp-instance 1,3-16 using portpri 40.
Console> (enable)
Enabling a 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.
Note
The software does not display the status of a MISTP instance until it has a VLAN with an active port
mapped to it.
To enable a MISTP instance, perform this task in privileged mode:
Task
Step 1
Enable a 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 a 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
.
.
.
78-12647-02
MISTP
ieee
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Command
set spantree portinstancepri {mod/port}
priority [instances]
Command
set spantree enable mistp-instance instance [all]
show spantree mistp-instance [instance] [active]
mod/port
Using MISTP-PVST+ or MISTP
7-25
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Troubleshooting
