用户希望SwitchA和SwitchB之间能够提供较大的链路带宽来使相同VLAN间互相通信。同时用户也希望能够提供一定的冗余度，保证数据传输和链路的可靠性。

准备工作

1.两台华为 S5720-52P-EI-AC 交换机通过业务口（光口 gi 0/0/49 to gi 0/0/52）；

2.两条光纤线，四个多模（MM）光模块；

交换机配置

在SwitchA和SwitchB上创建Eth-Trunk接口并加入成员接口。

SwitchA

[HUAWEI] sysname SwitchA
[SwitchA] interface eth-trunk 1
[SwitchA-Eth-Trunk1] trunkport gigabitethernet 0/0/1 to 0/0/3
[SwitchA-Eth-Trunk1] quit

SwitchB

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] interface eth-trunk 1
[SwitchB-Eth-Trunk1] trunkport gigabitethernet 0/0/1 to 0/0/3
[SwitchB-Eth-Trunk1] quit

创建VLAN并将接口加入VLAN。

创建VLAN10和VLAN20并分别加入接口。SwitchB的配置与SwitchA类似，不再赘述。

SwitchA

[SwitchA] vlan batch 10 20
[SwitchA] interface gigabitethernet 0/0/4
[SwitchA-GigabitEthernet0/0/4] port link-type trunk
[SwitchA-GigabitEthernet0/0/4] port trunk allow-pass vlan 10
[SwitchA-GigabitEthernet0/0/4] quit
[SwitchA] interface gigabitethernet 0/0/5
[SwitchA-GigabitEthernet0/0/5] port link-type trunk
[SwitchA-GigabitEthernet0/0/5] port trunk allow-pass vlan 20
[SwitchA-GigabitEthernet0/0/5] quit

SwitchB

[SwitchB] vlan batch 10 20
[SwitchB] interface gigabitethernet 0/0/4
[SwitchB-GigabitEthernet0/0/4] port link-type trunk
[SwitchB-GigabitEthernet0/0/4] port trunk allow-pass vlan 10
[SwitchB-GigabitEthernet0/0/4] quit
[SwitchB] interface gigabitethernet 0/0/5
[SwitchB-GigabitEthernet0/0/5] port link-type trunk
[SwitchB-GigabitEthernet0/0/5] port trunk allow-pass vlan 20
[SwitchB-GigabitEthernet0/0/5] quit

配置Eth-Trunk1接口允许VLAN10和VLAN20通过。SwitchB的配置与SwitchA类似，不再赘述。

SwitchA

[SwitchA] interface eth-trunk 1
[SwitchA-Eth-Trunk1] port link-type trunk
[SwitchA-Eth-Trunk1] port trunk allow-pass vlan 10 20
[SwitchA-Eth-Trunk1] quit

SwitchB

[SwitchB] interface eth-trunk 1
[SwitchB-Eth-Trunk1] port link-type trunk
[SwitchB-Eth-Trunk1] port trunk allow-pass vlan 10 20
[SwitchB-Eth-Trunk1] quit

配置Eth-Trunk1的负载分担方式

SwitchA

[SwitchA] interface eth-trunk 1
[SwitchA-Eth-Trunk1] load-balance src-dst-mac
[SwitchA-Eth-Trunk1] quit

SwitchB

[SwitchB] interface eth-trunk 1
[SwitchB-Eth-Trunk1] load-balance src-dst-mac
[SwitchB-Eth-Trunk1] quit

验证配置结果

在任意视图下执行display eth-trunk 1命令，检查Eth-Trunk是否创建成功，及成员接口是否正确加入。

[SwitchA] display eth-trunk 1
Eth-Trunk1's state information is: 
WorkingMode: NORMAL   Hash arithmetic: According to SA-XOR-DA
Least Active-linknumber: 1 Max Bandwidth-affected-linknumber: 8
Operate status: up Number Of Up Port In Trunk: 3 
--------------------------------------------------------------------------------
PortName   Status   Weight
GigabitEthernet0/0/1   Up   1
GigabitEthernet0/0/2   Up   1
GigabitEthernet0/0/3   Up   1

从以上信息看出Eth-Trunk 1中包含3个成员接口GigabitEthernet0/0/1、GigabitEthernet0/0/2和GigabitEthernet0/0/3，成员接口的状态都为Up。Eth-Trunk 1的“Operate status”为Up。