Which interfaces support BFD sessions on the AR router

In V200R001C00, only Ethernet interfaces support BFD sessions. In V200R001C01 and later versions, the following interfaces support common BFD sessions: Physical interfaces: Layer 3 Ethernet interfaces, serial interfaces (including synchronous SA interfaces, E1/T1 interfaces, CE1/CT1/PRI interfaces, CE3 interfaces, and CPOS interfaces), POS interfaces, ATM interfaces (including ADSL interfaces, VDSL interfaces, E1-IMA interfaces, and G.SHDSL interfaces) Logical interfaces: dialer interfaces, VLANIF interfaces, Layer 3 Eth-Trunk interfaces, IP-Trunk interfaces, MP-Group interfaces, MFR interfaces, IMA-Group interfaces, serial sub-interfaces, channelized serial sub-interfaces, IMA-Group sub-interfaces, POS sub-interfaces, ATM sub-interfaces, MFR sub-interfaces, Ethernet sub-interfaces (including Dot1q sub-interfaces and QinQ sub-interfaces), and Eth-Trunk sub-interfaces (Dot1q sub-interfaces). Note: When a physical Ethernet interface consists of multiple sub-interfaces, a BFD session can be established on the physical Ethernet interface or each sub-interface. In V200R001C01 and later versions, the following interfaces support multicast BFD sessions: Physical interfaces: Layer 2 and Layer 3 Ethernet interfaces. Logical interfaces: Layer 2 and Layer 3 Eth-Trunks. Note: Multicast BFD sessions cannot be established on Layer 2 Ethernet interfaces, Layer 2 Eth-Trunks, or Layer 3 Eth-Trunks of AR120, AR150, AR160, AR200 and AR1200's SRUs. When a physical Ethernet interface consists of multiple sub-interfaces, a BFD session can be established on the physical Ethernet interface or each sub-interface.

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