Do CE series switches support transparent transmission of BPDUs on a TRILL network

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In V100R003C10 and earlier versions, CE series switches do not support transparent transmission of BPDUs on a TRILL network.
In V100R003C10 and later versions, you can configure association between TRILL and MSTP for transparent transmission of BPDUs on a TRILL network without changing the root bridge.

Other related questions:
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.

Do network bridges on AR series routers transparently transmit BPDUs
No. Network bridges on all models of AR series routers do not transparently transmit BPDUs.

Loop prevention mechanisms on CE series switches at the edge of a TRILL network
Currently, you can perform the following operations to detect and eliminate loops when user-side devices connect to a TRILL network: 1. Configure the assured forwarding (AF) function on the edge device of the TRILL network so that only one device forwards user traffic, preventing loops. 2. In V100R003C00 and later versions, configure association between TRILL and MSTP when an MSTP network connects to a TRILL network. 3. In V100R003C00 and V100R003C10, configure an E-Trunk to enable dual-homing access to TRILL for active-active access if user-side devices are servers or network devices are dual-homed to the TRILL network. 4. In V100R005C00 and later versions, configure a multi-chassis link aggregation group (M-LAG) to enable dual-homing access to TRILL for active-active access if user-side devices are servers or network devices are dual-homed to the TRILL network.

Layer 2 transparent transmission on S series switch
Layer 2 transparent transmission mechanism on S series switches, except S1700: PEs replace the standard multicast destination MAC address of user-side Layer 2 protocol packets with a specified multicast MAC address according to the mappings between multicast destination MAC addresses and Layer 2 protocols. Internal nodes on the backbone network forward the packets across the backbone network as common Layer 2 packets. The egress device of the backbone network restores the original destination MAC address of the packets according to the mappings between multicast destination MAC addresses and Layer 2 protocols, and then forwards the packets to user networks. After the destination MAC address in a user-side packet is replaced, the packet traverses the backbone network, but will not be terminated. The new MAC address in packet is configured by the l2protocol-tunnel group-mac command. S series switches can transparently transmit the following packets: 1. Spanning Tree Protocol (STP) 2. Link Aggregation Control Protocol (LACP) 3. Ethernet Operation, Administration, and Maintenance 802.3ah (EOAM3ah) 4. Link Layer Discovery Protocol (LLDP) 5. Generic VLAN Registration Protocol (GVRP) 6. Generic Multicast Registration Protocol (GMRP) 7. HUAWEI Group Management Protocol (HGMP) 8. VLAN Trunking Protocol (VTP) 9. Unidirectional Link Detection (UDLD) 10. Port Aggregation Protocol (PAGP) 11. Cisco Discovery Protocol (CDP) 12. Per VLAN Spanning Tree Plus (PVST+) 13. Shared Spanning Tree Protocol (SSTP), only supported by fixed switches 14. Dynamic Trunking Protocol (DTP) 15. Device Link Detection Protocol (DLDP) 16. User-defined protocol packets

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