Configuring Spanning Tree Parameters Sample MST Region Configuration
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 6-46
Sample MST Region Configuration
An MST region identifies a group of MSTP 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.
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 ALE 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 spantree mst region name command. For example:
-> spantree mst region name “ALE Marketing”
2 Configure the MST Region revision level using the spantree mst region revision-level command. For
example:
-> spantree mst region revision-level 2000
Note. An additional configurable MST region parameter defines the maximum number of hops authorized
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.
MST Region
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Switch CSwitch B
Switch A
Switch E
Switch D
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SST Switches (STP or RSTP)
CST
IST
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