143
Default level
2: System level
Parameters
instance instance-id: Configures the device as a secondary root bridge in a particular MSTI. The value of
instance-id ranges from 0 to 32, where 0 represents the CIST.
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1-10>, where the
vlan-id argument represents the VLAN ID, in the range of 1 to 4094, and &<1-10> indicates that you can
specify up to 10 VLAN IDs or VLAN ID ranges.
Description
Use stp root secondary to configure the device as a secondary root bridge.
Use undo stp root to restore the default.
By default, a device is not a secondary root bridge.
To set an MSTP device as a secondary root bridge in a specific MSTI, use this command with the MSTI
specified. To set a PVST device as a secondary root bridge in a specific VLAN or multiple VLANs, use this
command with a VLAN list specified. To set an MSTP device in the CIST or an STP/RSTP device as a
secondary root bridge, use this command without specifying any MSTI and VLAN.
Once you specify the device as a secondary root bridge, you cannot change the priority of the device.
Related commands: stp priority and stp root primary.
Examples
# In MSTP mode, specify the device as a secondary root bridge in MSTI 1.
<Sysname> system-view
[Sysname] stp instance 1 root secondary
# In PVST mode, specify the device as a secondary root bridge in VLAN 1.
<Sysname> system-view
[Sysname] stp mode pvst
[Sysname] stp vlan 1 root secondary
stp root-protection
Syntax
stp root-protection
undo stp root-protection
View
Ethernet interface view, port group view, Layer 2 aggregate interface view
Default level
2: System level
Parameters
None
Description
Use stp root-protection to enable the root guard function on the ports.
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