Planet IGSW-2840, User Manual

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User’s Manual of IGSW-2840
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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: 1-4094)
Default Setting
none
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 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 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)#
mst priority
This command configures the priority of a spanning tree instance. Use the no form to restore the default.
Syntax
mst instance_id priority priority no mst instance_id priority
instance_id - Instance identifier of the spanning tree. (Range: 0-4094)
priority - Priority of the a spanning tree instance. (Range: 0-61440 in steps of 4096; Options: 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440)