Reference Guide

326 Spanning Tree
Multiple Spanning Tree
This section describes Multiple Spanning Tree Protocol (MSTP).
It contains the following topics:
• MSTP Overview
• MSTP Properties
•VLAN to MSTP Instance
• MSTP Instance Settings
• MSTP Interface Settings
MSTP Overview
MSTP maps VLANs into STP instances, using various load balancing
scenarios. As a result of this partitioning into instances, if port A is blocked in
one STP instance, the same port can be placed in the Forwarding State in
another STP instance.
In addition, packets assigned to various VLANs are transmitted along
different paths within Multiple Spanning Trees Regions (MST Regions).
Regions are one or more Multiple Spanning Tree bridges by which frames can
be transmitted.
MSTP Properties
To set an MSTP region:
1
Click Switching > Spanning Tree > MSTP Properties in the tree view to
display the
MSTP Properties: Summary page .
2 Enter the following fields:
– Region Name (1-32 Characters) — Enter the user-defined MSTP
region name.
–
Revision (0-65535) — Enter the unsigned 16-bit number that
identifies the current MST configuration revision. The revision
number is required as part of the MST configuration.
–
Max Hops (1-40) — Enter the total number of hops that occur in a
specific region before the BPDU is discarded. Once the BPDU is
discarded, the port information is aged out.