Command Line Interface
806 1553-KDU 137 365 Uen D 2006-06-16
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. The
ECN330-switch supports up to 4094 instances. Try to group VLANs
which cover the same general area of the network. However, remember
that all bridges within the same MSTI Region (section 7.15.12 on page
807) must be configured 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
7.15.11 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)
Console(config-mstp)#mst 1 vlan 2-5
Console(config-mstp)#
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