Does an Eth-Trunk support LACP priority preemption

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An Eth-Trunk supports LACP priority preemption only in LACP mode. You can run the lacp preempt enable command to enable LACP priority preemption.

In LACP mode, when an active link fails, the system selects the link with the highest priority from backup links to replace the faulty one. After the faulty link recovers and the priority of the link is higher than that of the backup one, if LACP priority preemption is enabled, the link with a high priority replaces the link with a low priority and switches to active.

LACP priority preemption configuration at both ends of an Eth-Trunk must be the same.

Other related questions:
What is the function of the delay for LACP preemption
When an Eth-Trunk interface in LACP mode goes Up and Down frequently due to unstable physical links, LACP goes Up and Down accordingly. As a result, services transmitted on the Eth-Trunk link are affected. After the LACP preemption delay is set, LACP negotiation is not performed during the delay period. The possibility of LACP flapping is reduced, and services will not be affected. You can run the lacp preempt enable command to enable the LACP preemption function on the current Eth-Trunk interface and run the lacp preempt delay delay-time command to configure the preemption delay.

How to determine the actor and partner of an Eth-Trunk in LACP mode
The Actor and Partner of an Eth-Trunk in LACP mode are determined as follows: The device with a smaller system LACP priority functions as the Actor. The System Priority field and the SysPri field of the Partner in the display eth-trunk command output represent system LACP priorities of local and remote devices respectively. A smaller value indicates a higher priority. By default, the system LACP priorities of devices are both 32768. If system LACP priorities of devices at both ends of the Eth-Trunk are the same, the device with a smaller MAC address functions as the Actor. The System ID field and the System ID field of the Partner in the display eth-trunk command output represent system MAC addresses of local and remote devices respectively.

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.

Whether the firewall supports cross-device link aggregation
The USG2000&5000&6000 do not support cross-device link aggregation.

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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