Chapter 5
Setup and Configuration
RUGGEDCOM RSG2488
User Guide
146 Configuring the MST Region Identifier
Parameter Description
even if the Cost style is set to RSTP, a port that migrates to STP will have its cost limited to
a maximum of 65535.
Desig Bridge ID Synopsis: $$ / ##-##-##-##-##-## where $$ is 0 to 65535, ## is 0 to FF
Provided on the root ports of designated bridges, the Bridge Identifier of the bridge this port
is connected to.
Section 5.2.9.3
Configuring the MST Region Identifier
Configuring the region identifier and revision level puts the MSTP bridge in a defined group. Other bridges that
have the same identifier and revision level are interconnected within this region. For more information, refer to
Section 5.2.3.1, “MSTP Regions and Interoperability”.
To configure the Multiple Spanning Tree (MST) region identifier, do the following:
1. Navigate to Spanning Tree > Configure MST Region Identifier. The MST Region Identifier form appears.
Figure 96: MST Region Identifier Form
1. Name Box 2. Revision Level Box 3. Digest Box 4. Apply Button 5. Reload Button
2. Configure the following parameter(s) as required:
Parameter Description
Name Synopsis: Any 32 characters
Default: 00-0A-DC-11-12-21
Variable length text string. You must configure an identical region name on all switches
you want to be in the same MST region.
Revision Level Synopsis: 0 to 65535
Default: 0
Use this parameter, if you want to create a new region from a subset of switches in a
current region, while maintaining the same region name.
Digest Synopsis: Any 32 characters
Default: 0
This is a read-only parameter and should be only used for network troubleshooting. In
order to ensure consistent VLAN-to-instance mapping, it is necessary for the protocol
to be able to exactly identify the boundaries of the MST regions. For that pupose, the
characteristics of the region are included in BPDUs. There is no need to propagate the
exact VLAN-to-instance mapping in the BPDUs because switches only need to know
whether they are in the same region as a neighbor. Therefore, only this 16-octet digest
created from the VLAN-to-instance mapping is sent in BPDUs.
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