ECS4100 Series CLI Reference Guide-R07

Chapter 22 | Spanning Tree Commands
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Command Mode
MST Configuration
Command Usage
◆ Use this command to group VLANs into spanning tree instances. MSTP
generates a unique spanning tree for each instance. This provides multiple
pathways across the network, thereby balancing the traffic load, preventing
wide-scale disruption when a bridge node in a single instance fails, and
allowing for faster convergence of a new topology for the failed instance.
◆ By default all VLANs are assigned to the Internal Spanning Tree (MSTI 0) that
connects all bridges and LANs within the MST region. This switch supports up
to 64 instances. You should try to group VLANs which cover the same general
area of your network. However, remember that you must configure all bridges
within the same MSTI Region (page 532) with the same set of instances, and the
same instance (on each bridge) with the same set of VLANs. Also, note that
RSTP treats each MSTI region as a single node, connecting all regions to the
Common Spanning Tree.
Example
Console(config-mstp)#mst 1 vlan 2-5
Console(config-mstp)#
name This command configures the name for the multiple spanning tree region in which
this switch is located. Use the no form of the command to set the name to the
default name.
Syntax
name name
no name
name - Name of multiple spanning tree region. (Range: 1-32 alphanumeric
characters)
Default Setting
Switch’s MAC address
Command Mode
MST Configuration
Command Usage
The MST region name and revision number (page 533) are used to designate a
unique MST region. A bridge (i.e., spanning-tree compliant device such as this
switch) can only belong to one MST region. And all bridges in the same region must
be configured with the same MST instances.