C
HAPTER
33
| Spanning Tree Commands
– 766 –
mst vlan This command adds VLANs to a spanning tree instance. Use the no form to
remove the specified VLANs. Using the no form without any VLAN
parameters to remove all VLANs.
SYNTAX
[no] mst instance-id vlan vlan-range
instance-id - Instance identifier of the spanning tree.
(Range: 0-4094)
vlan-range - Range of VLANs. (Range: 1-4093)
DEFAULT SETTING
none
COMMAND MODE
MST Configuration
COMMAND USAGE
â—† 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.
â—† 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 58 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 766) 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
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