Redundancy
RM Web L3E
Release
6.0
07/2010
7.5
Spanning Tree
185
Multiple Spanning Tree Protocol (MSTP)
MSTP is a further development of the Rapid Spanning Tree Protocol used to
increase the benefits of VLANs. MSTP allows you to define multiple groups
of VLANs, and to configure a separate Spanning Tree Instance for each
group. This Spanning Tree Instance prevents loops within the related VLAN
group and provides redundancy in the case of a failure.
Additionally, MSTP enables existing connections to be used more efficiently
in normal operation. For example, MSTP can set a connection between
2 bridges to the “discarding” state for a certain VLAN group, while
simultaneously operating the same connection for another VLAN group in the
“forwarding” state. MSTP thus enables you to use your resources more
efficiently.
Note: The following text uses the term Spanning Tree (STP) to describe
settings or behavior that applies to STP, RSTP or MSTP.
7.5.1 Global
With this dialog you can:
X switch the Spanning Tree Protocol on/off and select the RSTP or MSTP
protocol version
X display bridge-related information on the Spanning Tree Protocol
X configure bridge-related parameters of the Spanning Tree Protocol
X set bridge-related additional functions
X display the parameters of the root bridge and
X display bridge-related topology information.
Note: Rapid Spanning Tree is activated on the device by default, and it
automatically begins exploding the existing topology into a tree structure. If
you have deactivated RSTP on individual devices, you avoid loops during the
configuration phase.
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