248 CHAPTER 10: RSTP CONFIGURATION
By default, no VLAN is STP-Ignored if STP is enabled on the Switch.
Set Priority of a
Specified Bridge
Whether a bridge can be selected as the “root” of the spanning tree depends on
its priority. By assigning a lower priority, a bridge can be artificially specified as the
root of the spanning tree.
You can use the following command to configure the priority of a specified bridge.
Perform the following configurations in System View.
Table 269 Set Priority of a Specified Bridge
Note that if the priorities of all the bridges in the Switching network are the same,
the bridge with the smallest MAC address will be selected as the “root”. When
RSTP is enabled, an assignment of a priority to the bridge will lead to recalculation
of the spanning tree.
By default, the priority of the bridge is 32768.
Specify the Switch as
Primary or Secondary
Root Bridge
RSTP can determine the spanning tree root through calculation. You can also
specify the current Switch as the root using this command.
You can use the following commands to specify the current Switch as the primary
or secondary root of the spanning tree.
Perform the following configuration in System View.
Table 270 Specify the Switch as Primary or Secondary Root Bridge
After a Switch is configured as primary root bridge or secondary root bridge, you
cannot modify the bridge priority of the Switch.
A Switch can either be a primary or secondary root bridge, but not both of them.
If the primary root of a spanning tree instance is down or powered off, the
secondary root will take its place, unless you configure a new primary root. Of two
or more configured secondary root bridges, RSTP selects the one with the smallest
MAC address to take the place of the failed primary root.
Cancel the configuration of the STP-Ignored
VLAN
undo stp ignored vlan
vlan_list
Operation Command
Operation Command
Set priority of a specified bridge stp priority
bridge_priority
Restore the default priority of specified bridge undo stp priority
Operation Command
Specify the current Switch as the primary root bridge of the
spanning tree.
stp root primary
Specify the current Switch as the secondary root bridge of the
spanning tree.
stp root secondary
Disqualify the current Switch as the primary or secondary root. undo stp root
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