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Quick Steps for Configuring an MST Region Using 802.1s Multiple Spanning Tree
page 6-14 OmniSwitch 6600 Family Network Configuration Guide April 2006
Quick Steps for Configuring an MST Region
An MST region identifies a group of MSTP (802.1s) switches that is seen as a single, flat mode instance
by other regions and/or non-MSTP switches. A region is defined by three attributes: name, revision level,
and a VLAN-to-MSTI mapping. Switches configured with the same value for all three of these attributes
belong to the same MST region.
Note that an additional configurable MST region parameter defines the maximum number of hops autho-
rized for the region but is not considered when determining regional membership.The maximum hops
value is the value used by all bridges within the region when the bridge is acting as the root of the MST
region.
This section provides a tutorial for defining a sample MST region configuration, as shown in the diagram
below.
In order for switches A, B, and C in the above diagram to belong to the same MST region, they must all
share the same values for region name, revision level, and configuration digest (VLAN-to-MSTI
mapping).
The following steps are performed on each switch to define Alcatel Marketing as the MST region name,
2000 as the MST region revision level, map exiting VLANs to existing MSTIs, and 3 as the maximum
hops value for the region:
1 Configure an MST Region name using the bridge mst region name command. For example:
-> bridge mst region name “Alcatel Marketing”
2 Configure the MST Region revision level using the bridge mst region revision level command. For
example:
-> bridge mst region revision level 2000
MST Region
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OmniSwitch 7800
OmniSwitch 7800
OmniSwitch 7800
OmniSwitch 7800
OmniSwitch 7800
Switch C
Switch B
Switch A
Switch E
Switch D
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SST Switches (STP or RSTP)
CST
IST