Do the S2700&S3700&S5700&S6700 switches transparently transmit BPDUs by default

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By default, the S2700&S3700&S5700&S6700 switches do not transparently transmit Bridge Protocol Data Unit (BPDUs).

Other related questions:
Can the S2700/S3700/S5700/S6700 switches use AC and DC power supply simultaneously
In versions earlier than V100R006C01, the S2700, S3700, and S5700 cannot use AC and DC power supply simultaneously. In V100R006C01 and later versions, the S3700-26C-HI, S5700-28C-HI, and S5700-28C-HI-24S can use AC and DC power supply simultaneously. S6700 cannot use AC and DC power supply simultaneously. In V200R001C00 and later versions, the S5710-28C-EI and S5710-52C-EI can use AC and DC power supply simultaneously. In versions prior to V200R005C00, the S6700-EI cannot use AC and DC power supply simultaneously. In V200R005C00, the S5700-EI (non-PoE), S5700-SI (non-PoE), and S6700-EI can use AC and DC power supply simultaneously. In V200R006C00 and later versions, the S5720-HI (non-PoE) can use AC and DC power supply simultaneously. In V200R007C00 and later versions, the S5720-C-EI (non-PoE) and S5720-PC-EI (non-PoE) can use AC and DC power supply simultaneously. The S5720-SI (non-PoE) and S6720-EI newly available in V200R008C00 can use AC and DC power supply simultaneously.

How to enable a switch to transparently transmit BPDUs that are discarded by default
You can enable a switch to transparently transmit BPDUs in the following modes: 1. Run the bpdu bridge enable command to enable the port bridge function. Then the switch can transparently transmit all BPDUs. 2. Globally specify the group MAC address of BPDU for the inbound and outbound ports of two edge switches on the network, and enable the L2PT transparent transmission function of the protocol for the ports. Incoming BPDUs are replaced with the group MAC address, converted to data packets, and forwarded in the VLAN. Configure the L2PT function in the outbound port to replace the group MAC address with the BPDU MAC address.

How to configure BPDU tunneling on S series switches to transparently transmit BPDUs
To configure S series (except the S1700) and E series switches to transparently transmit BPDUs, perform the following operations: 1. Configure interface-based Layer 2 protocol transparent transmission. (1) Run the l2protocol-tunnel group-mac command in the system view to replace the multicast destination MAC address of Layer 2 protocol packets with a specified multicast MAC address. (2) Run the port default vlan command on the inbound and outbound interfaces to transparently transmit untagged BPDUs. (3) Run the l2protocol-tunnel { all | protocol-type } enable command on the inbound and outbound interfaces to enable interface-based Layer 2 protocol transparent transmission. 2. Configure VLAN-based Layer 2 protocol transparent transmission. (1) Run the l2protocol-tunnel group-mac command in the system view to replace the multicast destination MAC address of Layer 2 protocol packets with a specified multicast MAC address. (2) Run the port link-type hybrid and port hybrid tagged vlan commands on the inbound and outbound interfaces to transparently transmit tagged BPDUs. (3) Run the l2protocol-tunnel { all | protocol-type } vlan command on the inbound and outbound interfaces to enable VLAN-based Layer 2 protocol transparent transmission.

Does the S3700/S5700/S6700 support blackhole routes
The S3700/5700 V100R005, and S3700/5700/6700 V100R006 and later versions support blackhole routes. The following command configures a blackhole route: ip route-static ip-address mask NULL 0

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