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创作时间：2024年4月26日11点54分
链路聚合（Link Aggregation），又称为端口聚合（Port Trunking），是一种将多条物理链路聚合成一条逻辑链路的技术。它可以提高网络带宽、增强网络冗余性和改善网络负载均衡。
链路聚合的作用
提高网络带宽
链路聚合可以将多条物理链路的带宽叠加起来，从而提供更高的带宽。例如，将两条 1 Gbps 的物理链路聚合在一起，可以提供 2 Gbps 的带宽。
增强网络冗余性
如果一条或多条物理链路出现故障，链路聚合可以将流量自动切换到其他正常的链路上，从而保证网络的正常运行。
改善网络负载均衡
链路聚合可以将流量在多条物理链路上进行均衡分配，从而提高网络的整体性能。
使用场景
需要高带宽的网络，例如服务器集群、数据中心等。需要高可靠性的网络，例如金融机构、医疗机构等。需要负载均衡的网络，例如大型企业网络、ISP 网络等。手动模式配置
实验拓扑
LSW1基本配置
<Huawei>sysEnter system view, return user view with Ctrl+Z.[Huawei]un in enInfo: Information center is disabled.[Huawei]int eth-trunk 10[Huawei-Eth-Trunk10]trunk[Huawei-Eth-Trunk10]trunkport g 0/0/1 to 0/0/3Info: This operation may take a few seconds. Please wait for a moment...done.[Huawei-Eth-Trunk10]port link-type trunk[Huawei-Eth-Trunk10]port trunk allow-pass vlan all[Huawei-Eth-Trunk10]qint eth-trunk 10 ：进入Eth-Trunk 10的接口配置模式。
trunk ：在Eth-Trunk 10接口上启用Trunk模式。这实质上是将其从一组单独的物理链路转换为单个逻辑链路。
trunkport g 0/0/1 to 0/0/3 ：此命令将千兆以太网接口 g 0/0/1 至 g 0/0/3 添加为 Eth-Trunk 10 的成员接口。流量现在将分布在这些物理链路上。
port link-type trunk ：设置Eth-Trunk 10的链路类型为trunk。这可确保交换机将其视为单个逻辑链路。
port trunk allow-pass vlan all ：允许所有VLAN通过Eth-Trunk 10。默认情况下，Eth-Trunk只允许带标签的VLAN。此命令在 Eth-Trunk 上启用标记和未标记的 VLAN 流量。
配置完成之后查看链路聚合
[Huawei]dis eth-trunk Eth-Trunk10's state information is:WorkingMode: NORMAL Hash arithmetic: According to SIP-XOR-DIP 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
LSW2的基本配置
<Huawei>sysEnter system view, return user view with Ctrl+Z.[Huawei]un in enInfo: Information center is disabled.[Huawei]int Eth-Trunk 10[Huawei-Eth-Trunk10]trunkport g 0/0/1 to 0/0/3Info: This operation may take a few seconds. Please wait for a moment...done.[Huawei-Eth-Trunk10]port link-type trunk [Huawei-Eth-Trunk10]port trunk allow-pass vlan all[Huawei-Eth-Trunk10]q[Huawei]q查看链路聚合
<Huawei>dis eth-trunk Eth-Trunk10's state information is:WorkingMode: NORMAL Hash arithmetic: According to SIP-XOR-DIP 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
自动模式配置
实验拓扑
LSW3的基本配置
<Huawei>sysEnter system view, return user view with Ctrl+Z.[Huawei]un in enInfo: Information center is disabled.[Huawei]int eth[Huawei]int Eth-Trunk 10[Huawei-Eth-Trunk10]mode lacp-static [Huawei-Eth-Trunk10]load-balance dst-mac [Huawei-Eth-Trunk10]trunkport g 0/0/1 to 0/0/3Info: This operation may take a few seconds. Please wait for a moment...done.[Huawei-Eth-Trunk10]qmode lacp-static ：这会将链路聚合控制协议 (LACP) 模式设置为静态。静态LACP模式下，交换机手动捆绑指定的成员接口，无需与其他设备协商。
load-balance dst-mac ：配置Eth-Trunk使用目的MAC地址对成员接口之间的流量进行负载均衡。数据包将根据目的 MAC 地址进行哈希处理，结果值将决定数据包通过哪个成员接口发送。
trunkport g 0/0/1 to 0/0/3 ：此命令将千兆以太网接口 g 0/0/1 至 g 0/0/3 添加为 Eth-Trunk 10 的成员接口。现在流量将根据目标 MAC 在这些物理链路上分配每个数据包的地址。
<Huawei>dis eth-trunk Eth-Trunk10's state information is:Local:LAG ID: 10 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According to DA System Priority: 32768 System ID: 4c1f-cce1-2e0a 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 1GE 32768 2 2609 10111100 1 GigabitEthernet0/0/2 Selected 1GE 32768 3 2609 10111100 1 GigabitEthernet0/0/3 Selected 1GE 32768 4 2609 10111100 1 Partner:--------------------------------------------------------------------------------ActorPortName SysPri SystemID PortPri PortNo PortKey PortStateGigabitEthernet0/0/1 32768 4c1f-cc09-06f6 32768 2 2609 10111100GigabitEthernet0/0/2 32768 4c1f-cc09-06f6 32768 3 2609 10111100GigabitEthernet0/0/3 32768 4c1f-cc09-06f6 32768 4 2609 10111100LSW4的配置命令
<Huawei>sysEnter system view, return user view with Ctrl+Z.[Huawei]un in enInfo: Information center is disabled.[Huawei]int e[Huawei]int Eth-Trunk 10[Huawei-Eth-Trunk10]mode lacp-static [Huawei-Eth-Trunk10]load-balance dst-mac [Huawei-Eth-Trunk10]trunkport g 0/0/1 to 0/0/3Info: This operation may take a few seconds. Please wait for a moment...done.[Huawei-Eth-Trunk10]q[Huawei]dis eth-trunk Eth-Trunk10's state information is:Local:LAG ID: 10 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According to DA System Priority: 32768 System ID: 4c1f-cc09-06f6 Least Active-linknumber: 1 Max Active-linknumber: 8 Operate status: down Number Of Up Port In Trunk: 0 --------------------------------------------------------------------------------ActorPortName Status PortType PortPri PortNo PortKey PortState WeightGigabitEthernet0/0/1 Unselect 1GE 32768 2 2609 10100010 1 GigabitEthernet0/0/2 Unselect 1GE 32768 3 2609 10100010 1 GigabitEthernet0/0/3 Unselect 1GE 32768 4 2609 10100010 1 Partner:--------------------------------------------------------------------------------ActorPortName SysPri SystemID PortPri PortNo PortKey PortStateGigabitEthernet0/0/1 0 0000-0000-0000 0 0 0 10100011GigabitEthernet0/0/2 0 0000-0000-0000 0 0 0 10100011GigabitEthernet0/0/3 0 0000-0000-0000 0 0 0 10100011