CLI Reference Guide-R05

Chapter 18 | Spanning Tree Commands
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Command Usage
◆ MST priority is used in selecting the root bridge and alternate bridge of the
specified instance. The device with the highest priority (i.e., lowest numerical
value) becomes the MSTI root device. However, if all devices have the same
priority, the device with the lowest MAC address will then become the root
device.
◆ You can set this switch to act as the MSTI root device by specifying a priority of
0, or as the MSTI alternate device by specifying a priority of 16384.
Example
Console(config-mstp)#mst 1 priority 4096
Console(config-mstp)#
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 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 445) 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.