组网需求
如图1所示，在两台Router设备上配置LACP模式链路聚合组，提高两设备之间的带宽与可靠性，具体要求如下：
l 两条活动链路具有负载分担的能力。
l 两设备间的链路具有一条冗余备份链路，当活动链路出现故障链路时，备份链路替代故障链路，保持数据传输的可靠性。
配置思路
采用如下的思路配置LACP模式链路聚合：
1. 在Router设备上创建Eth-Trunk，配置Eth-Trunk为LACP模式，实现链路聚合功能。
2. 将成员接口加入Eth-Trunk。
3. 配置系统优先级，确定主动端，按照主动端设备的接口选择活动接口。
4. 配置活动接口上限阈值，实现保证带宽的情况下提高网络的可靠性。
5. 配置接口优先级，确定活动链路接口，优先级高的接口将被选作活动接口。
操作步骤
步骤1 创建编号为1的Eth-Trunk，配置它的工作模式为LACP模式
# 配置RouterA。
<Huawei> system-view
[Huawei] sysname RouterA
[RouterA] interface eth-trunk 1
[RouterA-Eth-Trunk1] mode lacp-static
[RouterA-Eth-Trunk1] quit
# 配置RouterB。
<Huawei> system-view
[Huawei] sysname RouterB
[RouterB] interface eth-trunk 1
[RouterB-Eth-Trunk1] mode lacp-static
[RouterB-Eth-Trunk1] quit
步骤2 将成员接口加入Eth-Trunk
# 配置RouterA。
[RouterA] interface ethernet 2/0/1
[RouterA-Ethernet2/0/1] eth-trunk 1
[RouterA-Ethernet2/0/1] quit
[RouterA] interface ethernet 2/0/2
[RouterA-Ethernet2/0/2] eth-trunk 1
[RouterA-Ethernet2/0/2] quit
[RouterA] interface ethernet 2/0/3
[RouterA-Ethernet2/0/3] eth-trunk 1
[RouterA-Ethernet2/0/3] quit
# 配置RouterB。
[RouterB] interface ethernet 2/0/1
[RouterB-Ethernet2/0/1] eth-trunk 1
[RouterB-Ethernet2/0/1] quit
[RouterB] interface ethernet 2/0/2
[RouterB-Ethernet2/0/2] eth-trunk 1
[RouterB-Ethernet2/0/2] quit
[RouterB] interface ethernet 2/0/3
[RouterB-Ethernet2/0/3] eth-trunk 1
[RouterB-Ethernet2/0/3] quit
步骤3 在RouterA上配置系统优先级为100，使其成为LACP主动端
[RouterA] lacp priority 100
步骤4 在RouterA上配置活动接口上限阈值为2
[RouterA] interface eth-trunk 1
[RouterA-Eth-Trunk1] max active-linknumber 2
[RouterA-Eth-Trunk1] quit
步骤5 在RouterA上配置接口优先级确定活动链路
[RouterA] interface ethernet 2/0/1
[RouterA-Ethernet2/0/1] lacp priority 100
[RouterA-Ethernet2/0/1] quit
[RouterA] interface ethernet 2/0/2
[RouterA-Ethernet2/0/2] lacp priority 100
[RouterA-Ethernet2/0/2] quit
步骤6 验证配置结果
# 查看各Router设备的Eth-Trunk信息，查看链路是否协商成功。
[RouterA] display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1 WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SA-XOR-DA
System Priority: 100 System ID: 00e0-fca8-0417
Least Active-linknumber: 1 Max Active-linknumber: 2
Operate status: Up Number Of Up Port In Trunk: 2
------------------------------------------------------------------------------
ActorPortName Status PortType PortPri PortNo PortKey PortState Weight
Ethernet2/0/1 Selected 100M 100 6145 2865 11111100 1
Ethernet2/0/2 Selected 100M 100 6146 2865 11111100 1
Ethernet2/0/3 Unselect 100M 32768 6147 2865 11100000 1
Partner:
------------------------------------------------------------------------------
PartnerPortName SysPri SystemID PortPri PortNo PortKey PortState
Ethernet2/0/1 32768 00e0-fca6-7f85 32768 6145 2609 11111100
Ethernet2/0/2 32768 00e0-fca6-7f85 32768 6146 2609 11111100
Ethernet2/0/3 32768 00e0-fca6-7f85 32768 6147 2609 11110000
[RouterB] display eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1 WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SA-XOR-DA
System Priority: 32768 System ID: 00e0-fca6-7f85
Least Active-linknumber: 1 Max Active-linknumber: 8
Operate status: Up Number Of Up Port In Trunk: 2
------------------------------------------------------------------------------
ActorPortName Status PortType PortPri PortNo PortKey PortState Weight
Ethernet2/0/1 Selected 100M 32768 6145 2609 11111100 1
Ethernet2/0/2 Selected 100M 32768 6146 2609 11111100 1
Ethernet2/0/3 Unselect 100M 32768 6147 2609 11100000 1
Partner:
------------------------------------------------------------------------------
PartnerPortName SysPri SystemID PortPri PortNo PortKey PortState
Ethernet2/0/1 100 00e0-fca8-0417 100 6145 2865 11111100
Ethernet2/0/2 100 00e0-fca8-0417 100 6146 2865 11111100
Ethernet2/0/3 100 00e0-fca8-0417 32768 6147 2865 11110000
通过以上显示信息可以看到，RouterA的系统优先级为100，高于RouterB的系统优先级。Eth-Trunk的成员接口中Ethernet 2/0/1、Ethernet 2/0/2成为活动接口，处于“Selected”状态，接口Ethernet 2/0/3处于“Unselect”状态，同时实现M条链路的负载分担和N条链路的冗余备份功能。
手动分担链路聚合示例： http://www.elvhome.com/html/2013-5-22/20135221729669805.html
