Does S series switch support inter-chassis Eth-Trunk

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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.

Other related questions:
Is inter-chassis link aggregation supported after a stack of CE switches is set up
Yes It is recommended that the stacked switch connect to the upstream and downstream devices using inter-chassis link aggregation to ensure link reliability.

Does an AR support inter-card Eth-Trunk
Only 8FE1GE and 24GE cards support inter-card Eth-Trunks. 4GE-2S, 4ES2G-S, 4ES2GP-S, and 9ES2 cards do not support inter-card Eth-Trunks.

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.

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