Instance Priority (Mstp) - Allied Telesis SwitchBlade x908 Series Software Reference Manual

instance priority (MSTP)

Use this command to set the priority for this device to become the root bridge for the
specified MSTI.
Use this command for MSTP only.
Use the no version of this command to restore the root bridge priority of the device for the
instance to the default.
Syntax
instance <msti-id> priority <priority>
no instance <msti-id> priority <priority>
Parameter
<msti-id>
<priority>
The default priority value for all instances is 32768.
Default
MST Configuration Mode
Mode
MSTP lets you distribute traffic more efficiently across a network by blocking different links for
Usage
different VLANs. You do this by making different devices into the root bridge for each MSTP
instance, so that each instance blocks a different link.
If all devices have the same root bridge priority for the instance, MSTP selects the device with
the lowest MAC address to be the root bridge. Give the device a higher priority for becoming
the root bridge for a particular instance by assigning it a lower priority number, or vice versa.
To set the root bridge priority for MSTP instance 2 to be the highest (0), so that it will be the
Example
root bridge for this instance when available, use the commands:
awplus(config-mst)#
To reset the root bridge priority for instance 2 to the default (32768), use the commands:
awplus(config-mst)#
region (MSTP)
Related Commands
revision (MSTP)
show spanning-tree mst config
spanning-tree mst instance
spanning-tree mst instance priority
C613-50007-01 REV B
Description
The MST instance ID (1-15).
<0-61440> Specify the root bridge priority for the device for the MSTI. A
lower priority number indicates a greater likelihood of the device
becoming the root bridge. The priority values can be set only in
increments of 4096. If you specify a number hat is not a multiple of 4096, it
will be rounded down.
Default: 32768
awplus# configure terminal
awplus(config)# spanning-tree mst configuration
instance 2 priority 0
awplus# configure terminal
awplus(config)# spanning-tree mst configuration
no instance 2 priority
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Spanning Tree Commands
19.7