HUAWEI QUIDWAY S5700 HOW-TOCONFIGURING LINK AGGREGATION IN STATIC LACP MODE

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GENERAL INFORMATIONSLink 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.

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 trunkinterface

Configure the link aggregation workingmode in LACP-Static

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.

SETTING THE LACP PRIORITY FOR MEMBER INTERFACES

3. Set the LACP priority for member interfacesEnter 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.

CHECKING THE CONFIGURATION4. Check the Eth-trunk and the member interfaces

[Huawei] display eth-trunk 0Eth-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 WeightGigabitEthernet0/0/1 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 PortStateGigabitEthernet0/0/1 32768 4c1f-cc6f-1459 100 2 145 10111100GigabitEthernet0/0/2 32768 4c1f-cc6f-1459 100 3 145 10111100GigabitEthernet0/0/3 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 0Trunk ID: 0 Used status: VALID TYPE: ethernet Working Mode : StaticNumber Of Ports in Trunk = 3Number Of Up Ports in Trunk = 3Operate status: up

Interface GigabitEthernet0/0/1, valid, operate up, weight=1Interface GigabitEthernet0/0/2, valid, operate up, weight=1Interface GigabitEthernet0/0/3, valid, operate up, weight=1

[Huawei]

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