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

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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.

Other related questions:
Does STP need to be enabled if no loop exists on an S series switch
For S (except the S1700) series switches, STP is used to prevent loops on a network. If no loop exists, STP can be disabled.

Enable and disable PoE on an S series switch
Enable or disable the PoE function on S series switches:

1. By default, the PoE function is enabled on an interface
2. Enable or disable PoE power supply.
<HUAWEI>system-view
[HUAWEI]interface gigabitethernet 1/0/0
[HUAWEI-GigabitEthernet1/0/0]undo poe enable  //Disable PoE power supply.
[HUAWEI-GigabitEthernet1/0/0]poe enable       //Enable PoE power supply.

The downlink electrical interfaces of PoE switches support PoE power supply, with up to 30 W power on each interface. The maximum power supply distance is 100 m.
Only ES0D0G48VA00 (S7700)/LE0DG48VEA00 (S9300) cards of modular switches (S7700/S9700/S9300/S12700) support PoE power supply.

If the switch connects to 48 V standard PoE powered devices but cannot negotiate power supply capabilities with the devices, you can run poe force-power on the interfaces to forcibly power on the devices.


Can an S series switch running RSTP be connected to another switch running STP
For S (except the S1700) series switches, STP protocols include the STP, RSTP, and MSTP protocols. These protocols are forward compatible and support device interconnection to a certain extent. The following describes the interconnection effects: 1. When an STP device connects to an RSTP device and the RSTP device connects to a port of the STP device, the RSTP mode automatically switches to STP to implement slow convergence. 2. When an RSTP device connects to an MSTP device, the CIST (instance 0) can be used to connect both devices. The connection ports are inter-AS ports. 3. When an MSTP device connects to an STP device and the MSTP device connects to a port of the STP device, the MSTP mode automatically switches to STP to implement slow convergence. Note: When a port whose mode switches to another mode is reconnected to another device, run the stp mcheck command to restore the original mode of the port.

On an S series switch, can the interface bound to a VPN instance be connected to a device
Yes. On an S series switch, the interface bound to a VPN instance can be connected to a device

Does the L2/L3 interface of an interface card of an AR router support being converted to be working in L3 mode
Check whether the Layer 3 Ethernet interface is switched over to a Layer 2 Ethernet interface. The procedure of converting the Layer 2 mode of a physical interface to the Layer 3 mode is as follows: 1. Choose LAN access > LAN > Physical interface to enter the physical interface configuration page. 2. In the operation column of the physical interface list, click the icon at the right side of details corresponding to a desired physical interface to switch over the physical interface between Layer 2 mode and Layer 3 mode. 3. In the prompt dialog box, click Yes to confirm the switchover.

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