Huawei AR530 Series - Page 51

l An Eth-Trunk in LACP mode is set up as follows:
1. Devices at both ends send LACPDUs to each other.
As shown in Figure 2-6, you need to create an Eth-Trunk in LACP mode on DeviceA
and DeviceB and add member interfaces to the Eth-Trunk. Then the member interfaces
are enabled with LACP, and devices at both ends can send LACPDUs to each other.
Figure 2-6 LACPDUs sent in LACP mode
DeviceBDeviceA
LACPDU
LACPDU
2. Devices at both ends determine the Actor and active links.
As shown in Figure 2-7, devices at both ends receive LACPDUs from each other. For
example, when DeviceB receives LACPDUs from DeviceA, DeviceB checks and
records information about DeviceA and compares system priorities. If the system
priority of DeviceA is higher than that of DeviceB, DeviceA acts as the Actor. If
DeviceA and DeviceB have the same system priority, the device with a smaller MAC
address functions as the Actor.
After devices at both ends select the Actor, they select active interfaces according to
the priorities of the Actor's interfaces. Then active interfaces are selected, active links
in the LAG are specified, and load balancing is implemented among these active
links.
Figure 2-7 Selecting the Actor in LACP mode
1
2
3 1
2
3
1
2
3 1
2
3
1
2
3
1
2
3
DeviceB
DeviceA
Compare system priority
and determine the Actor
The device with higher
system priority
LACP port priority
Actor
Actor
DeviceBDeviceA
DeviceBDeviceA
The Actor determines
active links
The device with lower
system priority
LACP port priority
LACP port priority LACP port priority
LACP port priority
LACP port priority
l LACP preemption
When LACP preemption is enabled, interfaces with higher priorities in an LAG function
as active interfaces.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
2 Link Aggregation Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
37