Set Priority Of A Specified Bridge; Specify The Switch As Primary Or Secondary Root Bridge - 3Com 400 Family Configuration Manual

172 C 10: RSTP C
HAPTER
Set Priority of a
Specified Bridge
Specify the Switch as
Primary or Secondary
Root Bridge
ONFIGURATION
consequent blocking by configuring the STP-Ignore attribute on the appropriate
Switch.
Once an STP-Ignored VLAN is configured, the packets of this VLAN will be
forwarded on any Switch port, with no restriction from the calculated STP path.
You can configure the STP-Ignore attribute on a Switch by using the following
commands.
Perform the following configuration in System View.
Table 173 Configuring the STP-Ignore Attribute of VLANs on a Switch
Operation
Specify an STP-Ignored VLAN
Cancel the configuration of the STP-Ignored
VLAN
By default, no VLAN is STP-Ignored if STP is enabled on the Switch.
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 174 Set Priority of a Specified Bridge
Operation

Set priority of a specified bridge

Restore the default priority of 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.
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 175 Specify the Switch as Primary or Secondary Root Bridge
Operation
Specify the current Switch as the primary root bridge of the
spanning tree.
Specify the current Switch as the secondary root bridge of the
spanning tree.
Command
stp ignored vlan vlan_list
undo stp ignored vlan vlan_list
Command
stp priority bridge_priority
undo stp priority
Command
stp root primary
stp root secondary