Is STP enabled on S series switches by default

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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

Other related questions:
What is the default STP mode for S series switches
For S (except the S1700) and E series switches, STP works in MSTP mode by default.

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.


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.

SNMP port numbers of S series switches
After SNMP is configured on S series switches (except S1700), UDP ports are enabled by default. By default, the port number for SNMP and NMS connection is 161 and the port number for sending alarms to the NMS is 162.
You can use the snmp-agent udp-port port-num command to configure the port number for SNMP and NMS connection.

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