How to configure a user-side interface on the STP-enabled switch

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To prevent a user-side interface from frequently changing between Up and Down states, run the stp disable command on the interface to disable STP or run the stp edged-port enable command to configure it as an edge port so that it does not participate in STP calculation.

Other related questions:
Does STP need to be configured when an interface on an S series switch that functions as an L3 interface is connected to another device
If an interface of an S series switch (except the S1700) functions as an L3 interface, disable STP on the interface. If the interface connects to terminals, configure the interface as an edge interface. To use this interface as an L2 interface after STP is disabled on this interface, enable STP again. Otherwise, loops cannot be prevented.

Configure STP on an interface of the S1728GWR-4P switch
Configure STP on an interface of an S1728GWR-4P switch as follows: 1. Choose Spanning Tree > STP. 2. Select Configure Interface from the Step drop-down list box. 3. Select Configure from the Action drop-down list box. 4. Configure the parameters such as Spanning Tree, Admin Link Type, Priority, and Admin Path Cost. 5. Click Apply.

Display STP configuration of an interface on the S1728GWR-4P switch
Display the STP configuration of an interface on an S1728GWR-4P switch as follows: 1. Choose Spanning Tree > STP. 2. Select Configure Interface from the Step drop-down list box. 3. Select Show Information from the Action drop-down list box. 4. The configured parameters (such as STP Status, Port Role, Designated Bridge, Oper Path Cost, and Oper Edge Port) are displayed.

STP enabling/disabling method on an AR router
By default, STP is enabled on an AR router globally and on Layer 2 interface. Run the stp enable command in the system or interface view to enable STP globally or on Layer 2 interface. Run the stp disable command in the system or interface view to disable STP globally or on Layer 2 interface.

Display global STP configuration of the S1728GWR-4P switch
Display the global STP configuration of an S1728GWR-4P switch as follows: 1. Choose Spanning Tree > STP. 2. Select Configure Global from the Step drop-down list box. 3. Select Show Information from the Action drop-down list box. 4. The configured parameters (such as Spanning Tree Status, Spanning Tree Type, Designated Root, Root Path Cost, and Bridge ID) are displayed.

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