3Com Switch 8800 Configuration Guide Chapter 38 MSTP Region-configuration
38-15
III. Activating the MST region configuration,and exit the MST region view
Perform the following configuration in MST region view.
Table 38-3 Activate the MST region configuration and exit the MST region view
Operation Command
Show the configuration information of the MST
region under revision
check
region-configuration
Manually activate the MST region configuration active
region-configuration
Exit MST region view quit
MSTP can determine the spanning tree root through calculation. You can also specify
the current switch as the root, using the command provided by the switch.
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 38-4 Specify the switch as a primary or a secondary root bridge
Operation Command
Specify the current switch as the primary
root bridge of the specified spanning
tree
stp [ instance instance-id ] root
primary [ bridge-diameter bridgenum ]
[ hello-time centi-senconds ]
Specify the current switch as the
secondary root bridge of the specified
spanning tree
stp [ instance instance-id ] root
secondary [ bridge-diameter
bridgenum ] [ hello-time
centi-senconds ]
Specify current switch not to be the
primary or secondary root undo stp [ instance instance-id ] root
After a switch is configured as the primary root bridge or the secondary root bridge,
users cannot modify the bridge priority of the switch.
You can configure the current switch as the primary or secondary root bridge of the STI
(specified by the instance instance-id parameter). If the instance-id takes 0, the current
switch is specified as the primary or secondary root bridge of the CIST.
The root types of a switch in different STIs are independent of one another. The switch
can be a primary or secondary root of any STI. However, it cannot serve as both the
primary and secondary roots of one STI.