组网需求

如图1所示，DeviceA双归接入DeviceB和DeviceC，在DeviceA上部署LACP模式的Eth-Trunk接口，成员口分别与DeviceB和DeviceC的10GE1/0/1～10GE1/0/2连接，10GE1/0/1～10GE1/0/2的接口速率和双工模式相同，现在需要使流量可以在两台设备上负载分担。

配置思路

采用如下的思路配置跨设备LACP模式链路聚合：

分别在DeviceA、DeviceB、DeviceC上创建Eth-Trunk1，并配置为静态LACP模式，将成员接口加入Eth-Trunk1，实现链路聚合功能。
在DeviceB和DeviceC上配置相同的LACP系统ID。
在DeviceB和DeviceC上配置相同的系统LACP优先级。
在DeviceC上配置Eth-Trunk成员接口在LACP协议中的编号扩展，使成员接口编号均增加32768，避免和设备DeviceB上的成员接口在LACP协议中的编号相同。

操作步骤

分别在DeviceA、DeviceB和DeviceC上创建Eth-Trunk1并配置为LACP模式，并将成员口加入Eth-Trunk1。

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface eth-trunk 1
[*DeviceA-Eth-Trunk1] mode lacp-static
[*DeviceA-Eth-Trunk1] trunkport 10ge 1/0/1 to 1/0/4
[*DeviceA-Eth-Trunk1] commit
[~DeviceA-Eth-Trunk1] quit

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] interface eth-trunk 1
[*DeviceB-Eth-Trunk1] mode lacp-static
[*DeviceB-Eth-Trunk1] trunkport 10ge 1/0/1 to 1/0/2
[*DeviceB-Eth-Trunk1] commit

<HUAWEI> system-view
[~HUAWEI] sysname DeviceC
[*HUAWEI] commit
[~DeviceC] interface eth-trunk 1
[*DeviceC-Eth-Trunk1] mode lacp-static
[*DeviceC-Eth-Trunk1] trunkport 10ge 1/0/1 to 1/0/2
[*DeviceC-Eth-Trunk1] commit

配置DeviceB和DeviceC的系统ID为00e0-fc12-3456。

[~DeviceB-Eth-Trunk1] lacp system-id 00e0-fc12-3456
[*DeviceB-Eth-Trunk1] commit
[~DeviceB-Eth-Trunk1] quit

[~DeviceC-Eth-Trunk1] lacp system-id 00e0-fc12-3456
[*DeviceC-Eth-Trunk1] commit
[~DeviceC-Eth-Trunk1] quit

在DeviceB和DeviceC上配置系统LACP优先级为100。

[~DeviceB] lacp priority 100
[*DeviceB] commit

[~DeviceC] lacp priority 100
[*DeviceC] commit

在DeviceC上配置Eth-Trunk成员接口编号扩展，使成员接口编号均增加32768。

[~DeviceC] interface eth-trunk 1
[~DeviceC-Eth-Trunk1] lacp port-id-extension enable
[*DeviceC-Eth-Trunk1] commit

验证配置结果

# 查看各Device设备的Eth-Trunk信息，查看链路是否协商成功。

[~DeviceA] display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1                       Working Mode: Static
Preempt Delay: Disabled         Hash Arithmetic: profile default
System Priority: 100            System ID: 00e0-fc12-3457
Least Active-linknumber: 1      Max Active-linknumber: 16Operating Status: up            Number Of Up Ports In Trunk: 4
Timeout Period: Slow
--------------------------------------------------------------------------------
ActorPortName          Status   PortType PortPri PortNo PortKey PortState Weight
10GE1/0/1              Selected 10GE     32768   3      321     10111100  1
10GE1/0/2              Selected 10GE     32768   1      321     10100010  1
10GE1/0/3              Selected 10GE     32768   4      321     10111100  1
10GE1/0/4              Selected 10GE     32768   2      321     10100010  1

Partner:
--------------------------------------------------------------------------------
ActorPortName          SysPri   SystemID        PortPri PortNo PortKey PortState
10GE1/0/1              100      00e0-fc12-3456  32768   32769  321     10111100
10GE1/0/2              100      00e0-fc12-3456  32768   32770  321     10111100
10GE1/0/1              100      00e0-fc12-3456  32768   4      321     10111100
10GE1/0/2              100      00e0-fc12-3456  32768   5      321     10111100

[~DeviceB] display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1                       Working Mode: Static
Preempt Delay: Disabled         Hash Arithmetic: profile default
System Priority: 100            System ID: 00e0-fc12-3456
Least Active-linknumber: 1      Max Active-linknumber: 32Operating Status: up            Number Of Up Ports In Trunk: 2
Timeout Period: Slow
--------------------------------------------------------------------------------
ActorPortName          Status   PortType PortPri PortNo PortKey PortState Weight
10GE1/0/1              Selected 10GE     32768   4      321     10111100  1
10GE1/0/2              Selected 10GE     32768   5      321     10111100  1

Partner:
--------------------------------------------------------------------------------
ActorPortName          SysPri   SystemID        PortPri PortNo PortKey PortState
10GE1/0/3              100      00e0-fc12-3457  32768   4      321     10111100
10GE1/0/4              100      00e0-fc12-3457  32768   2      321     10100010

[~DeviceC] display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1                       Working Mode: Static
Preempt Delay: Disabled         Hash Arithmetic: profile default
System Priority: 100            System ID: 00e0-fc12-3456
Least Active-linknumber: 1      Max Active-linknumber: 16Operating Status: up            Number Of Up Ports In Trunk: 2
Timeout Period: Slow
--------------------------------------------------------------------------------
ActorPortName          Status   PortType PortPri PortNo PortKey PortState Weight
10GE1/0/1              Selected 10GE     32768   32769  321     10111100  1
10GE1/0/2              Selected 10GE     32768   32770  321     10111100  1

Partner:
--------------------------------------------------------------------------------
ActorPortName          SysPri   SystemID        PortPri PortNo PortKey PortState
10GE1/0/1              100      00e0-fc12-3457  32768   3      321     10111100
10GE1/0/2              100      00e0-fc12-3457  32768   1      321     10100010

通过以上显示信息可以看到，各Device的Operating Status均为Up，表明Eth-Trunk1已经协商成功。DeviceB和DeviceC上的成员接口成为活动接口，处于“Selected”状态，表示DeviceB和DeviceC上的成员接口均可以负载分担。DeviceC的PortNo显示成员口的LACP编号已经增加32768。