ECS3510-26P_Management Guide R02

C HAPTER 32 | Spanning Tree Commands
– 805 –
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 5832 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 805) 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 to clear the name.
SYNTAX
name name
name - Name of the spanning tree.
DEFAULT SETTING
Switch’s MAC address
COMMAND MODE
MST Configuration
COMMAND USAGE
The MST region name and revision number (page 806) 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.