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To enable root protect for a spanning-tree instance interface:

Enable configuration of the spanning-tree protocol:
[edit]user@host# edit protocols (mstp | rstp | vstp <vlan vlan-id>)
Enable configuration of the spanning-tree instance interface:
[edit ... protocols (mstp | rstp | vstp <vlan vlan-id>)]user@host# edit interface interface-name
Enable root protection on the interface:
[edit ... protocols (mstp | rstp | vstp <vlan vlan-id>) interface interface-name]user@host# set no-root-port
Verify the configuration of root protect for the spanning-tree instance interface:
[edit ... protocols (mstp | rstp | vstp <vlan vlan-id>) interface interface-name]user@host# topuser@host# show ... protocols ...
(mstp | rstp | vstp <vlan vlan-id>) {interface interface-name {no-root-port;}}
Note: This is not a complete configuration.