C
HAPTER
33
| Spanning Tree Commands
– 1067 –
DEFAULT SETTING
32768
COMMAND MODE
MST Configuration
COMMAND USAGE
â—† 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.
â—† 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
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 32 instances. You should try to group VLANs
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