Stp Root Primary - H3C S5120-SI Series Command Reference Manual

Parameters
None
Description
Use the stp region-configuration command to enter MST region view.
Use the undo stp region-configuration command to restore the default MST region configurations.
By default, the default settings are used for all the three MST region parameters. Namely, the device's
MST region name is the device's MAC address, all VLANs are mapped to the CIST, and the MSTP
revision level is 0.
After you enter MST region view, you can configure the MST region-related parameters, including the
region name, VLAN-to-instance mappings and revision level.
Examples
# Enter MST region view.
<Sysname> system-view
[Sysname] stp region-configuration
[Sysname-mst-region]

stp root primary

Syntax
stp [ instance instance-id ] root primary
undo stp [ instance instance-id ] root
View
System view
Default Level
2: System level
Parameters
instance instance-id: Configures the device as the root bridge in a particular MSTI. The minimum value
of instance-id is 0, representing the CIST, and the maximum value of instance-id is 3.
Description
Use the stp root primary command to configure the current device as the root bridge.
Use the undo stp root command to restore the system default.
By default, a device is not a root bridge in any MSTI.
Note that:
There is only one root bridge in effect in an MSTI. If two or more devices have been designated to
be root bridges of the same MSTI, MSTP will select the device with the lowest MAC address as the
root bridge.
You can specify a root bridge for each MSTI without caring about the device priority. After
specifying the current device as the root bridge or a secondary root bridge, you cannot change the
priority of the device.
1-33