Do S series switches support association between EFM and an Eth-Trunk

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S series switches do not support association between EFM and an Eth-Trunk. They support only association between EFM and an interface.

Other related questions:
Can EFM OAM be associated with an Eth-Trunk
EFM OAM cannot be associated with an Eth-Trunk. EFM OAM can be associated with an interface.

The difference between E-trunk and Eth-Trunk on S series switches
For S series switches (except the S1700): Eth-Trunk, also called link aggregation, bundles multiple physical links to form a logical link to increase link bandwidth. The bundled links can enhance link reliability through mutual backup. E-Trunk (Enhanced Trunk), developed from LACP (a link aggregation protocol for a single device), is a mechanism that implements link aggregation among multiple devices. E-Trunk achieves device-level link reliability, instead of card-level link reliability previously achieved by LACP.

Link aggregation support on S series fixed switches
S series fixed switches (except the S1700) support the link aggregation function. For details about link aggregation support on the fixed switches, see the "Ethernet Switching - Link Aggregation" in the S1720&S2700&S3700&S5700&S6700 Product Use Precautions.

Does S series switch support inter-chassis Eth-Trunk
The S series switches support inter-chassis Eth-Trunk. The Eth-Trunks on different stand-alone switches can form an E-Trunk. An E-Trunk protects the links between the CE and PEs and implements backup between PEs.

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