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Ether Channel

Latest reply: Mar 10, 2019 10:07:49 385 1 0 0 0


Link aggregation refers to a method of binding a group of physical interfaces as a logical interface to increase the bandwidth. Link aggregation is called multi-interface load balancing group or link aggregation group (LAG). For more information about link aggregation, refer to IEEE802.3ad.

By setting up an LAG between two devices, you can obtain higher bandwidth and greater reliability. The link aggregation provides redundancy protection for communications among devices without upgrading the hardware.

  • Active and Inactive Interfaces

    The interfaces in the active state that are responsible for forwarding data are active interfaces. On the contrary, the interfaces in the inactive state that do not forward data are inactive interfaces. According to the operation modes, active and inactive interfaces are classified as follows:

    • Manual load balancing mode: Generally, all member interfaces are active ones unless a fault occurs on these interfaces.

    • 1:1 active/standby mode: Normally, the primary interface is the active interface and the backup interface is the inactive interface. When the primary interface fails, the backup interface is activated and the primary interface becomes the inactive interface.

    • Static LACP mode: The interfaces connected to M links are active interfaces. The active interfaces are responsible for forwarding data. The interfaces connected to N links are inactive interfaces. The inactive interfaces are responsible for backup.

  • Actor and Partner

    In static LACP mode, the device with a higher LACP priority at both ends of an LAG is the Actor and the device with a lower LACP priority is the Partner.

    Differentiating the Actor and the Partner is to keep the active interfaces of devices at both ends the same. If devices at both ends select active interfaces according to the priority of their own interfaces, the active interfaces are different and the active links cannot be set up. Therefore, the Actor is first determined. The Partner selects active interfaces according to the priority of the interfaces of the Actor, as shown in Figure 3-1.

This post was last edited by Amr_Fayrouz_Elattar at 2019-03-02 15:13.
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Created Mar 10, 2019 10:07:49

LACP, as specified in IEEE 802.3ad, implements dynamic link aggregation and de-aggregation, allowing LACP-enabled switches at both ends to exchange Link Aggregation Control Protocol Data Units (LACPDUs). LACP provides a standard negotiation mechanism that a Huawei switch can use to create and enable the aggregated link based on its configuration. After an aggregated link is formed, LACP is responsible for maintaining the link. LACP adjusts the link if an aggregated link's status changes.

In LACP mode, a link switchover in a LAG is triggered if a device at one end detects one of the following events:

- An active link goes Down.
- Ethernet OAM detects a link fault.
- LACP detects a link fault.
- An active interface becomes unavailable.
- When LACP preemption is enabled, a backup interface becomes the active interface as soon as its priority is changed to be higher than that of the current active interface.
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