2-592
Catalyst 6500 Series Switch Command Reference—Release8.1
78-15474-01
Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands set spantree disable
set spantree disable
To disable the spanning tree algorithm for all VLANs or a specific VLAN or disable spanning tree
instance, use the set spantree disable command.
set spantree disable vlan
set spantree disable all
set spantree disable mistp-instance instance
set spantree disable mistp-instance all
Syntax Description
Defaults The default is spanning tree is enabled, and all instances are enabled (flooding disabled).
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines This command is not supported by the NAM.
If you do not specify a VLAN number or an instance number, 1 is assu med.
When an instance is enabled, the Spanning Tree Protocol starts running on that instance.
When an instance is disabled, the switch stops sending out config type-length values (TLVs) for that
instance and starts flooding incoming TLVs for the same instance (but checks t he V L AN mapp in g o n
the incoming side). All the traffic running on the VLANs mapped to the instance is flooded as well.
This command is not available in MST mode.
Examples This example shows how to disable the spanning tree for VLAN 1:
Console> (enable) set spantree disable 1
VLAN 1 bridge spanning tree disabled.
Console> (enable)
vlan Number of the VLAN; valid values are from 1 to 1005 and from
1025 to 4094.
all Specifies all VLANs.
mistp-instance
instance Specifies the instance number; valid values are from 1 to 16.
mistp-instance all Deletes all instances.