148
Default
A device is not a root bridge.
Views
System view
Predefined user roles
network-admin
Parameters
instance instance-list: Specifies a space-separated list of up to 10 MSTI items. Each item specifies
an MSTI or a range of MSTIs in the form of instance-id1 [ to instance-id2 ]. The value for instance-id2
must be equal to or greater than the value for instance-id1. The value range for the instance-id
argument is 0 to 4094, and the value 0 represents the CIST.
vlan vlan-id-list: Specifies a space-separated list of up to 10 VLAN items. Each item specifies a
VLAN or a range of VLANs in the form of vlan-id1 [ to vlan-id2 ]. The value for vlan-id2 must be equal
to or greater than the value for vlan-id1. The value range for the vlan-id argument is 1 to 4094.
Usage guidelines
Once you specify the device as the root bridge, you cannot change the priority of the device.
If you do not specify an MSTI or VLAN, this command configures the device as the root bridge of the
MSTP CIST or of the STP or RSTP spanning tree.
Examples
# In MSTP mode, specify the device as the root bridge of MSTI 1.
<Sysname> system-view
[Sysname] stp instance 1 root primary
# In PVST mode, specify the device as the root bridge of VLAN 1.
<Sysname> system-view
[Sysname] stp vlan 1 root primary
Related commands
• stp priority
• stp root secondary
stp root secondary
Use stp root secondary to configure the device as a secondary root bridge.
Use undo stp root to restore the default.
Syntax
stp [ instance instance-list | vlan vlan-id-list ] root secondary
undo stp [ instance instance-list | vlan vlan-id-list ] root
Default
A device is not a secondary root bridge.
Views
System view
Predefined user roles
network-admin
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