LACP 模式链路聚合：为了提高Eth-Trunk的容错性，并且能提供备份功能，保证成员链路的高可靠性，出现了链路聚合控制协议LACP（Link Aggregation Control Protocol），LACP模式就是采用LACP 的一种链路聚合模式。
LACP为交换数据的设备提供一种标准的协商方式，以供设备根据自身配置自动形成聚合链路并启动聚合链路收发数据。
聚合链路形成以后，LACP负责维护链路状态，在聚合条件发生变化时，自动调整或解散链路聚合。
1、拓扑图
2、创建vlan，并将接口加入到vlan中
SWA
[SWA]vlan batch 101 102 Info: This operation may take a few seconds. Please wait for a moment...done. [SWA]int g0/0/1 [SWA-GigabitEthernet0/0/1]port link-type access [SWA-GigabitEthernet0/0/1]port default vlan 101 [SWA-GigabitEthernet0/0/1]quit [SWA]int g0/0/2 [SWA-GigabitEthernet0/0/2]port link-type access [SWA-GigabitEthernet0/0/2]port default vlan 102 [SWA-GigabitEthernet0/0/2]quit
SWB
[Huawei]sysname SWB [SWB]vlan batch 101 102 Info: This operation may take a few seconds. Please wait for a moment...done. [SWB]int g0/0/1 [SWB-GigabitEthernet0/0/1]port link-type access [SWB-GigabitEthernet0/0/1]port default vlan 101 [SWB-GigabitEthernet0/0/1]quit [SWB]int g0/0/2 [SWB-GigabitEthernet0/0/2]port link-type access [SWB-GigabitEthernet0/0/2]port default vlan 102 [SWB-GigabitEthernet0/0/2]quit
3、创建Eth-Trunk接口，设置为LACP模式，并将成员加入进来,同时将接口设置为trunk模式，允许vlan101和vlan102通过
SWA
[SWA]int Eth-Trunk 1 [SWA-Eth-Trunk1]mode lacp-static [SWA-Eth-Trunk1]trunkport GigabitEthernet 0/0/21 to 0/0/24 Info: This operation may take a few seconds. Please wait for a moment...done. [SWA-Eth-Trunk1]port link-type trunk [SWA-Eth-Trunk1]port trunk allow-pass vlan 101 102 [SWA-Eth-Trunk1]quit
SWB
[SWB]int Eth-Trunk 1 [SWB-Eth-Trunk1]mode lacp-static [SWB-Eth-Trunk1]trunkport GigabitEthernet 0/0/21 to 0/0/24 Info: This operation may take a few seconds. Please wait for a moment...done. [SWB-Eth-Trunk1]port link-type trunk [SWB-Eth-Trunk1]port trunk allow-pass vlan 101 102 [SWB-Eth-Trunk1]quit
4、配置SWA为LACP的主动端，将其优先级设为100，并配置活动接口上限为2，设置接口优先级确定初始活动链路。
SWA
[SWA]lacp priority 100 [SWA]int Eth-Trunk 1 [SWA-Eth-Trunk1]max active-linknumber 2 [SWA-Eth-Trunk1]quit [SWA]int g0/0/21 [SWA-GigabitEthernet0/0/21]lacp priority 100 [SWA-GigabitEthernet0/0/21]quit [SWA]int g0/0/22 [SWA-GigabitEthernet0/0/22]lacp priority 100 [SWA-GigabitEthernet0/0/22]quit
5、查看配置效果
21和22接口为活动接口，实现负载链路聚合。
同时23、24接口为备份接口，当21、22出现故障的时候立刻启动备份链路，提高可靠性。
[SWA]dis eth-trunk 1 Eth-Trunk1's state information is: Local: LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP System Priority: 100 System ID: 4c1f-cc64-1d11 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 GigabitEthernet0/0/21 Selected 1GE 100 22 305 10111100 1 GigabitEthernet0/0/22 Selected 1GE 100 23 305 10111100 1 GigabitEthernet0/0/23 Unselect 1GE 32768 24 305 10100000 1 GigabitEthernet0/0/24 Unselect 1GE 32768 25 305 10100000 1 Partner: -------------------------------------------------------------------------------- ActorPortName SysPri SystemID PortPri PortNo PortKey PortState GigabitEthernet0/0/21 32768 4c1f-cc35-195e 32768 22 305 10111100 GigabitEthernet0/0/22 32768 4c1f-cc35-195e 32768 23 305 10111100 GigabitEthernet0/0/23 32768 4c1f-cc35-195e 32768 24 305 10110000 GigabitEthernet0/0/24 32768 4c1f-cc35-195e 32768 25 305 10110000 [SWA]
将21接口shutdown查看效果
[SWA]int g0/0/21 [SWA-GigabitEthernet0/0/21]shutdown [SWA-GigabitEthernet0/0/21]dis eth [SWA-GigabitEthernet0/0/21]dis eth-trunk 1 Eth-Trunk1's state information is: Local: LAG ID: 1 WorkingMode: STATIC Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP System Priority: 100 System ID: 4c1f-cc64-1d11 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 GigabitEthernet0/0/21 Unselect 1GE 100 22 305 10100010 1 GigabitEthernet0/0/22 Selected 1GE 100 23 305 10111100 1 GigabitEthernet0/0/23 Selected 1GE 32768 24 305 10111100 1 GigabitEthernet0/0/24 Unselect 1GE 32768 25 305 10100000 1 Partner: -------------------------------------------------------------------------------- ActorPortName SysPri SystemID PortPri PortNo PortKey PortState GigabitEthernet0/0/21 0 0000-0000-0000 0 0 0 10100011 GigabitEthernet0/0/22 32768 4c1f-cc35-195e 32768 23 305 10111100 GigabitEthernet0/0/23 32768 4c1f-cc35-195e 32768 24 305 10111100 GigabitEthernet0/0/24 32768 4c1f-cc35-195e 32768 25 305 10110000 [SWA-GigabitEthernet0/0/21]
切换时基本感受不到网络变化。
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