R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

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You can configure the current device as the root bridge by setting the device priority to 0. For the device
priority configuration, see "Configuring the device priority."
Configuring the current device as the root bridge of a specific
spanning tree
Step Command Remarks
1. Enter system view.
system-view N/A
2. Configure the current
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, a device does not
function as the root bridge.
Configuring the current 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 current 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, a device does not
function as 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 a device in a specified MSTI:
Step Command Remarks
1. Enter system view.
system-view N/A