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4 - 64 ONline Ethernet Bridge Module Installation and Operation Guide
SET SPANTREE BRIDGE_PRIORITY
Use the SET SPANTREE BRIDGE_PRIORITY command to change the
Spanning Tree priority of the local Bridge Module.
Format
SET SPANTREE BRIDGE_PRIORITY {variable}
Parameters
{variable} = 0 - 65535 (default is 128)
Example
OEBM> set spantree bridge_priority 117 [ENTER]
Spanning tree parameter changed
Description
The SET SPANTREE BRIDGE_PRIORITY command enables you to change the
Spanning Tree priority of the local Bridge Module.
The bridge priority is used with the bridge Ethernet Address to determine
which bridge becomes the Root Bridge in the network. The full bridge
priority is the numeric value that consists of (Bridge Priority)/(Bridge
Ethernet Address), for example, 128/08008F00A103. Since the bridge
priority is the first part of this number, lowering this value has a dramatic
effect on whether the bridge is the Root Bridge or not.
The Root Bridge controls the active Forward Delay_Time, Hello_Address,
Hello_Time, and Listen_Time parameters used by all bridges that are active
in the Spanning Tree topology. The 3Com factory setting for the bridge
priority is 128 to reduce the chance that this bridge will have the lowest
number and so become root. It is suggested that you do not change this
value unless you want to force this bridge to be the root.