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To do... Use the command... Remarks
Configure the name of the MST
region
region-name name
Required
The default MST region name of a
switch is its MAC address.
instance instance-id vlan
vlan-list
Configure the VLAN-to-instance
mapping table for the MST region
vlan-mapping modulo
modulo
Required
Both commands can be used to
configure VLAN-to-instance
mapping tables.
By default, all VLANs in an MST
region are mapped to MSTI 0.
Configure the MSTP revision
level for the MST region
revision-level level
Required
The default revision level of an
MST region is level 0.
Activate the configuration of the
MST region manually
active
region-configuration
Required
Display the configuration of the
current MST region
check
region-configuration
Optional
Display the currently valid
configuration of the MST region
display stp
region-configuration
Available in any view
Neighbor Topology Discovery Protocol (NTDP) packets sent by devices in a cluster can only be
transmitted within the MSTI where the management VLAN of the cluster resides. For more information
about clusters and the NTDP protocol, see Cluster Operation.
Configuring MST region-related parameters (especially the VLAN-to-instance mapping table) results in
spanning tree recalculation and network topology jitter. To reduce network topology jitter caused by the
configuration, MSTP does not recalculate spanning trees immediately after the configuration; it does
this only after you perform one of the following operations, and then the configuration can really takes
effect:
z Activate the new MST region-related settings by using the active region-configuration command
z Enable MSTP by using the stp enable command
z MSTP-enabled switches are in the same region only when they have the same format selector (a
802.1s-defined protocol selector, which is 0 by default and cannot be configured), MST region
name, VLAN-to-instance mapping table, and revision level.
z The 3Com switches 4500 support only the MST region name, VLAN-to-instance mapping table,
and revision level. Switches with the settings of these parameters being the same are assigned to
the same MST region.