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Catalyst 6500 Series Switch Command Reference—Release 8.4
OL-6244-01
Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands
set spantree mst
set spantree mst
To configure the mapping of VLANs to an MST instance or to configure ports that are connected to
neighbors that are in pre-standard MST mode, use the set spantree mst command.
set spantree mst instance vlan vlan
set spantree mst {mod/port} {pre-std | auto}
Syntax Description
Defaults Ports are set to auto.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines All changes made to the region configuration (region information and VLAN mapping) are buffered.
Only one user can hold the buffer at a time. This buffer is locked when you first use the set spantree mst
instance or set spantree mst config commands.
If the VLAN is already mapped to some other instance, the VLAN is unmapped from that instance and
mapped to the new instance.
Each time you map a new VLAN or VLANs, they are added to the existing mapping.
All unmapped VLANs are automatically mapped to MST instance 0 (IST).
You can configure up to 64 instances, including the mandatory instance 0. If 64 instances have already
been configured, you cannot create an additional instance by mapping more VLANs to it.
If a port is connected to a neighbor that is running pre-standard MST, you can configure the port to
operate in pre-standard MST mode by entering the set spantree mst mod/port pre-std command.
Pre-standard MST is the implementation of MST that is not compliant with with IEEE Std 802.1s. MST
implementation is pre-standard on Catalyst 6500 series switches that are running software before
release 8.3(1) . MST implementation is pre-standard on Catalyst 6500 series switches that are running
any Cisco IOS software release.
instance Number of the instance; valid values are from 0 to 4094. See the “Usage Guidelines”
section for more information.
vlan vlan Specifies the VLAN number; valid values are from 1 to 4094.
mod/port Number of the module and the port on the module.
pre-std Configures a port that is connected to a switch running pre-standard MST. See the “Usage
Guidelines” section for more information.
auto Reverts a port that is in pre-standard MST mode back to standard MST mode
(IEEE Std 802.1s). See the “Usage Guidelines” section for more information.