Configuring Static LACP Parameters

Procedure

1. Access the system view.

   system-view

2. Set a system LACP priority value for the FW.

   lacp priority priority

   The system LACP priority value is set to prioritize the devices on both ends of an Eth-Trunk link. The device with a higher system LACP priority is selected as the Actor of the aggregation group, and active interfaces are selected based on the priorities of interfaces on the Actor.

   A smaller system LACP priority value represents a higher priority.

   Select one device on the Eth-Trunk link as the Actor and set a smaller system LACP priority value for the device. By default, the system LACP priority value is 32768. Therefore, the device whose system LACP priority value is smaller than 32768 can be the Actor.

   If neither of the devices at the two ends of an Eth-Trunk link has a system LACP priority value, the devices use the default value 32768. In this case, the Actor is selected based on device system IDs. The device with the smaller system ID becomes the Actor.

3. Access the Eth-Trunk member interface view.

   interface interface-type interface-number

4. Set an LACP priority value for the interface.

   lacp priority priority

   The interface LACP priority value is set to prioritize interfaces on a device. The interface of a higher priority is selected as the active interface.

   

   The interface LACP priority value represents the priority of the interface to become active. The smaller interface LACP priority value indicates a higher priority. The default interface LACP priority value is 32768.

5. Exit from the interface view.

   quit

6. Access the Eth-Trunk interface view.

   interface eth-trunk trunk-id

7. Set an upper threshold for the number of active member interfaces.

   max active-linknumber link-number

   After the upper threshold for the number of active member interfaces is set, adding more interfaces to the Eth-Trunk interface does not increase the number of active member interfaces.

   

   Set the same upper threshold for the number of active member interfaces in the Eth-Trunk interfaces at both ends of an Eth-Trunk link. Otherwise, the smaller upper threshold takes effect.

8. Enable LACP preemption for the Eth-Trunk interface.

   lacp preempt enable

   LACP preemption ensures that the interfaces with higher LACP priorities are active interfaces. For example, an interface with a higher LACP priority becomes an inactive interface due to a fault. If the interface recovers and LACP preemption is enabled, the interface can become an active interface again. If the interface recovers and LACP preemption is disabled, the interface cannot become an active interface again.

   

   It is recommended that both ends of an Eth-Trunk link be enabled with LACP priority preemption or both ends be disabled from LACP priority preemption, which ensures the normal operating of the Eth-Trunk link.

9. Set an LACP preemption delay for the Eth-Trunk interface.

   lacp preempt delay delay-time

   The LACP preemption delay indicates the time for inactive interfaces in an Eth-Trunk interface in static LACP mode to wait to become active interfaces.

   Set the same LACP preemption delay on both ends of an Eth-Trunk link. Otherwise, a longer LACP preemption delay is used when both ends have the same number upper threshold for the number of Up links.

10. Set a timeout period for the interface to receive LACP packets.

    lacp timeout { fast | slow }

    The default timeout period is 90s (slow).

    

    • After you run the command in this step, the local Eth-Trunk interface sends the timeout period to the peer end using LACP packets.

      • If you specify fast, the timeout period for receiving packets is 3s on the local end, and the interval at which the peer end sends LACP packets is 1s.

      • If you specify slow, the timeout period for receiving packets is 90s on the local end, and the interval at which the peer end sends LACP packets is 30s.

    • Different timeout periods for receiving packets can be set for both ends of an Eth-Trunk link. The same timeout period for receiving packets is recommended for both ends of an Eth-Trunk link, which facilitates network maintenance.