This weekly How-To is to describe the configuration of the link aggregation. Stay with us!

1. HUAWEI QUIDWAY S5700 HOW-TO
CONFIGURING LINK AGGREGATION IN STATIC LACP MODE
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2. GENERAL INFORMATIONS
Link aggregation is a method of bundling a group of physical interfaces into a logical interface to increase link
bandwidth. It is also called load sharing group or link aggregation group.
By setting up a link aggregation group between two devices, you can obtain higher bandwidth and reliability. Link
aggregation provides redundancy protection without the need for upgrading the hardware.
S5700 supports two Link Aggregation modes:
- Manual load balancing mode
- Static LACP mode
In this simple procedure we will focus on the Static LACP mode.
In static LACP mode, two devices exchange LACP packets to negotiate aggregation parameters and determine the active
interfaces and inactive interfaces. In this mode, you must create an Eth-Trunk interface and than add member interfaces.
The active interfaces and inactive interfaces are determined by LACP negotiation.
The static LACP mode is also called the M:N mode, where links implement load balancing and redundancy at the same
time. In a link aggregation group, M links are active and load balance data traffic. N links are inactive and function as
backup links. When an active link fails, the backup link with the highest priority replaces the failed link to forward data
and its status changes to active.
In static LACP mode, some links function as backup links. In manual load balancing mode, all member interfaces work in
forwarding state to share the traffic. This is the main difference between the two modes.

3. CONFIGURING AN ETH-TRUNK INTERFACE TO WORK IN
STATIC LACP MODE
<Huawei> system-view
[Huawei] interface Eth-Trunk 0
[Huawei-Eth-Trunk0] mode lacp-static
[Huawei-Eth-Trunk0]
1. Configure the Eth trunk
Enter the configuration view
Create and enter the Eth trunk
interface
Configure the link aggregation working
mode in LACP-Static

4. ADDING MEMBER INTERFACES TO AN ETH-
TRUNK INTERFACE
[Huawei-Eth-Trunk0] trunkport GigabitEthernet 0/0/1 to 0/0/3
[Huawei-Eth-Trunk0] quit
2. Add the member interfaces to the virtual Eth-trunk Add the member interfaces to the Eth trunk
(in this example GE0/0/1, GE0/0/2 e
GE0/0/3)
When adding an interface to an Eth-Trunk interface, you must pay attention to the following points:
 An Eth-Trunk contains a maximum of eight member interfaces.
 A member interface cannot be configured with any service or static MAC address.
 When adding an interface to an Eth-Trunk, ensure that the interface is a hybrid interface (default interface type).
 An Eth-Trunk interface cannot have other Eth-Trunk interfaces as its member interfaces.
 An Ethernet interface can be added to only one Eth-Trunk interface. To add the Ethernet interface to another Eth-
Trunk interface, delete it from the current Eth-Trunk first.
 An Eth-Trunk interface contains member interfaces of the same type. For example, an FE interface and a GE
interface cannot be added to the same Eth-Trunk.
 Ethernet interfaces on different LPUs can be added to the same Eth-Trunk interface.
 The peer interfaces directly connected to the local Eth-Trunk member interfaces must also be bundled into an
Eth-Trunk interface; otherwise, the two ends cannot communicate.
 When the member interfaces work at different rates, the interfaces with a smaller rate may be congested, and
packets may be lost on these interfaces.
 After interfaces are added to an Eth-Trunk interface, MAC addresses are learned on the Eth-Trunk interface but
not the member interfaces.

5. SETTING THE LACP PRIORITY FOR MEMBER
INTERFACES
3. Set the LACP priority for member interfaces
Enter the interface view
[Huawei] interface GigabitEthernet 0/0/1
[Huawei-GigabitEthernet0/0/1] lacp priority 100
[Huawei-GigabitEthernet0/0/1] quit
[Huawei] interface GigabitEthernet 0/0/2
[Huawei-GigabitEthernet0/0/2] lacp priority 100
[Huawei-GigabitEthernet0/0/1] quit
[Huawei] interface GigabitEthernet 0/0/3
[Huawei-GigabitEthernet0/0/2] lacp priority 200
[Huawei-GigabitEthernet0/0/1] quit
Set the LACP interface priority
Exit the interface view
By default, the interface LACP priority is 32768. A smaller priority value indicates a higher LACP
priority.
In an Eth-Trunk interface, interfaces with higher LACP priorities are selected as active interfaces. In
our example GE0/0/1 and GE0/0/2 will be active interfaces, while GE0/0/3 will be the standby
interface.

6. CHECKING THE CONFIGURATION
4. Check the Eth-trunk and the member interfaces
[Huawei] display eth-trunk 0
Eth-Trunk0's state information is:
Local:
LAG ID: 0 WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 100 System ID: 4c1f-cccf-0172
Least Active-linknumber: 1 Max Active-linknumber: 8
Operate status: up Number Of Up Port In Trunk: 3
--------------------------------------------------------------------
------------
ActorPortName Status PortType PortPri PortNo PortKey PortState Weight
GigabitEthernet0/0/1 Selected 1000TG 100 2 145 10111100 1
GigabitEthernet0/0/2 Selected 1000TG 100 3 145 10111100 1
GigabitEthernet0/0/3 Selected 1000TG 200 4 145 10111100 1
Partner:
--------------------------------------------------------------------
------------
ActorPortName SysPri SystemID PortPri PortNo PortKey PortState
GigabitEthernet0/0/1 32768 4c1f-cc6f-1459 100 2 145 10111100
GigabitEthernet0/0/2 32768 4c1f-cc6f-1459 100 3 145 10111100
GigabitEthernet0/0/3 32768 4c1f-cc6f-1459 200 4 145 10111100
[Huawei]
In this prcedure we have shown the configuration
steps for Switch A; the same configuration steps
must be repeated for Switch B.
[Huawei] display trunkmembership eth-trunk 0
Trunk ID: 0
Used status: VALID
TYPE: ethernet
Working Mode : Static
Number Of Ports in Trunk = 3
Number Of Up Ports in Trunk = 3
Operate status: up
Interface GigabitEthernet0/0/1, valid, operate up, weight=1
Interface GigabitEthernet0/0/2, valid, operate up, weight=1
Interface GigabitEthernet0/0/3, valid, operate up, weight=1
[Huawei]

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