Does STP need to be enabled if no loop exists on an S series switch

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For S (except the S1700) series switches, STP is used to prevent loops on a network. If no loop exists, STP can be disabled.

Other related questions:
How can I check whether a loop exists on an S series switch
The simplest way to check the existence of a loop on an S series switch (except the S1700) is to check whether a MAC address flapping alarm exists on the switch. If the alarm exists, you can quickly locate the loop based on the information in the alarm. Run the display mac-address flapping record command to check whether MAC address flapping exists, or run the display trapbuffer command to check whether the alarm contains The mac-address has flap value or MAC move detected. For more information, visit Layer 2 Loop Troubleshooting.

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.

Is STP enabled on S series switches by default
For Sx700 series switches (except the S1700) running V100R005 or an earlier version, STP is disabled globally by default, and STP on interfaces is enabled by default. For Sx700 series switches (except the S1700) running V100R006 or a later version, STP is enabled globally and on interfaces by default. For E series switches, STP is enabled globally and on interfaces by default. For S9300 series switches, STP is disabled globally by default, and STP on interfaces is enabled by default. For S5700 switches running V100R005, BPDU is disabled by default, and an interface discards received BPDUs by default. To enable BPDU, run the following commands: [HUAWEI] stp enable [HUAWEI] interface GigabitEthernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] bpdu enable

Whether to enable STP if an AR router is used as a user access device
If an AR is used as a user access device (the WAN interface of the router is connected to the Internet, and the LAN interface is connected to an intranet), you are advised to disable STP to avoid network flapping due to STP convergence.

Do I need to enable STP after an Eth-Trunk is configured on S series switches
You do not need to configure STP after an Eth-Trunk is configured on S series switches (except the S1700).

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