334 CHAPTER 10: USING RSTP COMMANDS
Description
Use the stp root primary command to configure the current Switch as the
primary root of a spanning tree.
Use the undo stp root command to cancel the current Switch for primary root of
a spanning tree.
By default, the Switch is not a primary root.
You can designate a primary root for the spanning tree without caring about the
priority configuration of the Switch.
CAUTION: In a switching network, you can configure no more than one primary
root for a spanning tree but you can configure one or more secondary roots for it.
Remember not to designate more than one primary root in a spanning tree;
otherwise, the switching behavior will be unpredictable.
After a Switch is configured as a primary root bridge or secondary root bridge, you
can not modify the bridge priority of the Switch.
Example
To designate the current Switch as the primary root of a spanning tree, enter the
following:
<SW5500>system-view
System View: return to User View with Ctrl+Z.
[SW5500]stp root primary
stp root secondary Syntax
stp root secondary
undo stp root
View
System view
Parameter
None
Description
Use the stp root secondary command to configure the current Switch as a
secondary root of a specified spanning tree.
Use the undo stp root command to cancel the designation of the current Switch
for a secondary root of a specified spanning tree.
By default, a Switch is not a secondary root.
You can designate one or more secondary roots for a spanning tree. When the
primary root fails or is powered off, a secondary root can take its place. If more
than one secondary root exists, the one with the smallest MAC address will
become the primary root of the specified spanning tree.
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