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Chapter 7
Configuring Spanning Tree
If you are working from a Telnet connection to your switch, the first time you enable MISTP-PVST+ or
Caution
MISTP mode, you must do so from the switch console; do not use a Telnet connection through the data
port or you will lose the connection to the switch. Once you map a VLAN to a MISTP instance, you can
Telnet to the switch.
To change from PVST+ to MISTP-PVST+ or MISTP, perform this task in privileged mode:
Task
Set a spanning tree mode.
This example shows how to set a switch to MISTP-PVST+ mode:
Console> (enable) set spantree mode mistp-pvst+
PVST+ database cleaned up.
Spantree mode set to MISTP-PVST+.
Warning!! There are no VLANs mapped to any MISTP instance.
Console> (enable)
You can display VLAN-to-MISTP instance mapping information propagated from the root switch at
runtime. This display is available only in the MISTP or MISTP-PVST+ mode. When in the PVST+
mode, use the optional keyword config, to display the list of mappings configured on the local switch.
Note
MAC addresses are not displayed when the keyword config is specified.
To display spanning tree mapping, perform this task in privileged mode:
Task
Step 1
Set spanning tree mode to MISTP.
Step 2
Show spanning tree mapping.
This example shows how to display the spanning tree VLAN instance mapping in MISTP mode:
MISTP/MISTP-PVST+
Console> (enable) set spantree mode mistp
PVST+ database cleaned up.
Spantree mode set to MISTP.
Console> (enable) show spantree mapping
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Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Command
set spantree mode {mistp | pvst+ | mistp-pvst+}
Command
set spantree mode mistp
show spantree mapping [config]
Using MISTP-PVST+ or MISTP
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Troubleshooting
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