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Step Command Remarks
2. Configure the device as
the root bridge.
• In STP/RSTP mode:
stp root primary
• In PVST mode:
stp vlan vlan-id-list root primary
• In MSTP mode:
stp [ instance instance-list ] root
primary
By default, the device is not a
root bridge.
Configuring the device as a secondary root bridge of a
specific spanning tree
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Configure the device as a
secondary root bridge.
• In STP/RSTP mode:
stp root secondary
• In PVST mode:
stp vlan vlan-id-list root secondary
• In MSTP mode:
stp [ instance instance-list ] root
secondary
By default, the device is not
a secondary root bridge.
Configuring the device priority
Device priority is a factor in calculating the spanning tree. The priority of a device determines
whether the device can be elected as the root bridge of a spanning tree. A lower value indicates a
higher priority. You can set the priority of a device to a low value to specify the device as the root
bridge of the spanning tree. A spanning tree device can have different priorities in different spanning
trees.
During root bridge selection, if all devices in a spanning tree have the same priority, the one with the
lowest MAC address is selected. You cannot change the priority of a device after it is configured as
the root bridge or as a secondary root bridge.
To configure the priority of the device in a specified MSTI:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Configure the priority of
the device.
• In STP/RSTP mode:
stp priority priority
• In PVST mode:
stp vlan vlan-id-list priority priority
• In MSTP mode:
stp [ instance instance-list ] priority
priority
The default setting is 32768.
Configuring the maximum hops of an MST region
Restrict the region size by setting the maximum hops of an MST region. The hop limit configured on
the regional root bridge is used as the hop limit for the MST region.
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