验证理论：
- 验证默认为手工聚合模式
- 验证链路聚合两边的聚合组号可以不相同
- 割接：在对业务影响最小的前提下将手工链路聚合修改为LACP链路聚合
- 验证LACP主动端选举原则：设备优先级默认32768越小越优先，优先级相同，比较MAC地址，也是越小越优先
- 验证LACP活动端口选举原则：接口优先级默认32768越小越优先，优先级相同，比较MAC地址，也是越小越优先
实验拓扑：
一.
实验目的：
验证默认为手动聚合模式
实验步骤：
添加链路聚合组，加入成员端口，不指定聚合模式
[LSW1]int Eth-Trunk 1
[LSW1-Eth-Trunk1]trunkport GigabitEthernet 0/0/2 to 0/0/3
[LSW1]dis eth-trunk 1
Eth-Trunk1'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: 2
--------------------------------------------------------------------------------
PortName Status Weight
GigabitEthernet0/0/2 Up 1
GigabitEthernet0/0/3 Up 1
实验结论：
所以默认为手动聚合模式
二.
实验目的：
验证链路聚合两边的聚合组号可以不同
实验步骤：
[LSW1]int Eth-Trunk 1
[LSW1-Eth-Trunk1]trunkport GigabitEthernet 0/0/2 to 0/0/3
[LSW2]int Eth-Trunk 2
[LSW2-GigabitEthernet0/0/2]eth-trunk 2
[LSW2-GigabitEthernet0/0/3]eth-trunk 2
[LSW2]dis eth-trunk 2
Eth-Trunk2's state information is:
Local:
LAG ID: 2 WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768 System ID: 4c1f-ccc1-6203
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
GigabitEthernet0/0/2 Selected 1GE 32768 3 561 10111100 1
GigabitEthernet0/0/3 Selected 1GE 32768 4 561 10111100 1
Partner:
--------------------------------------------------------------------------------
ActorPortName SysPri SystemID PortPri PortNo PortKey PortState
GigabitEthernet0/0/2 32768 4c1f-ccda-7331 32768 3 305 10111100
GigabitEthernet0/0/3 32768 4c1f-ccda-7331 32768 4 305 10111100
实验结论：
所以聚合组号仅具有本地意义，两边可以不同
三.
实验目的：
在对业务影响最小的前提下将手工链路聚合修改为LACP链路聚合
实验步骤：
第一步，打开PC上的长ping模拟业务运行
第二步，设置SW之间的STP为MSTP加速收敛
[LSW1]stp mode mstp
[LSW2]stp mode mstp
第三步，在LSW1和2中间再添加一个聚合组，调整接口stp cost，使业务流量走临时新建立的聚合组
[LSW1]int Eth-Trunk 10
[LSW1-Eth-Trunk10]trunkport GigabitEthernet 0/0/4 to 0/0/5
[LSW1-Eth-Trunk10]p l a
[LSW1-Eth-Trunk10]p d v 10
[LSW2]int Eth-Trunk 10
[LSW2-Eth-Trunk10]trunkport GigabitEthernet 0/0/4 0/0/5
[LSW2-Eth-Trunk10]p l a
[LSW2-Eth-Trunk10]p d v 10
经查看LSW1为根桥
[LSW1]dis stp
-------[CIST Global Info][Mode MSTP]-------
CIST Bridge :32768.4c1f-ccda-7331
Config Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC :32768.4c1f-ccc1-6203 / 10000
CIST RegRoot/IRPC :32768.4c1f-ccda-7331 / 0
修改LSW2的接口cost
[LSW2-Eth-Trunk1]stp cost 100
产生大量丢包后自动恢复
注释：因为ENSP的交换机在接收到TC报文后无法将设备上已经学习到的MAC地址老化时间强制修改为15s，这是一个bug。据说在真机上只会丢几个包，客户实际体验不到网络变化
第四步，修改之前的聚合组为LACP，调整接口stp cost，使业务流量走之前的聚合组
尝试修改模式时提示报错，需要先将接口移出
[LSW1-Eth-Trunk1]mode lacp-static
Error: Error in changing trunk working mode. There is(are) port(s) in the trunk
[LSW1-Eth-Trunk1]undo trunkport GigabitEthernet 0/0/2 0/0/3
[LSW1-Eth-Trunk1]mode lacp-static
[LSW1-Eth-Trunk1]trunkport GigabitEthernet 0/0/2 0/0/3
2配置相同
[LSW1]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: 32768 System ID: 4c1f-ccda-7331
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
GigabitEthernet0/0/2 Selected 1GE 32768 3 305 10111100 1
GigabitEthernet0/0/3 Selected 1GE 32768 4 305 10111100 1
Partner:
--------------------------------------------------------------------------------
ActorPortName SysPri SystemID PortPri PortNo PortKey PortState
GigabitEthernet0/0/2 32768 4c1f-ccc1-6203 32768 3 561 10111100
GigabitEthernet0/0/3 32768 4c1f-ccc1-6203 32768 4 561 10111100
第五步，撤销临时聚合组，割接完成
直接删除时，提示报错需要先删除成员
[LSW1]undo interface Eth-Trunk 10
Info: This operation may take a few seconds. Please wait for a moment...failed.
Error: Because there are member interfaces in the Trunk interface, this configuration is not allowed.
[LSW1-Eth-Trunk10]undo trunkport GigabitEthernet 0/0/4 0/0/5
[LSW1]undo int Eth-Trunk 10
LSW2类似
四/五.
实验目的：
验证LACP主动端与活动端口选举原则
实验步骤：
第一步，将4,5添加进入之前的组中，使成员端口变成4。设置活动接口为2，开启抢占模式
[LSW1-Eth-Trunk1]max active-linknumber 2
第二步，修改LSW1的2,3端口优先级为0；LSW2的4,5端口优先级为0
[LSW1-GigabitEthernet0/0/2]lacp priority 0
[LSW1-GigabitEthernet0/0/3]lacp priority 0
[LSW1]dis eth-trunk 1
Eth-Trunk1's state information is:
Local:
LAG ID: 1 WorkingMode: STATIC
Preempt Delay Time: 30 Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768 System ID: 4c1f-ccda-7331
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
GigabitEthernet0/0/2 Unselect 1GE 0 3 305 10100000 1
GigabitEthernet0/0/3 Unselect 1GE 0 4 305 10100000 1
GigabitEthernet0/0/4 Selected 1GE 32768 5 305 10111100 1
GigabitEthernet0/0/5 Selected 1GE 32768 6 305 10111100 1
Partner:
--------------------------------------------------------------------------------
ActorPortName SysPri SystemID PortPri PortNo PortKey PortState
GigabitEthernet0/0/2 32768 4c1f-ccc1-6203 32768 3 561 10100000
GigabitEthernet0/0/3 32768 4c1f-ccc1-6203 32768 4 561 10100000
GigabitEthernet0/0/4 32768 4c1f-ccc1-6203 0 5 561 10111100
GigabitEthernet0/0/5 32768 4c1f-ccc1-6203 0 6 561 10111100
[LSW2]dis eth-trunk 2
Eth-Trunk2's state information is:
Local:
LAG ID: 2 WorkingMode: STATIC
Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768 System ID: 4c1f-ccc1-6203
分析:选择端口为2,3端口，因为两边交换机的优先级均为默认32768，LSW2的MAC:4c1f-ccc1-6203小于LSW1的MAC:4c1f-ccda-7331。所以LSW2为主，选择活动端口，根据比较原则，选择优先级最小的4和5口。LSW1为从，所以活动的接口是4和5口
第三步，修改LSW1的系统优先级为4096
[LSW1]lacp priority 4096
等待协商过程之后
[LSW2]dis eth-trunk 2
Eth-Trunk2's state information is:
Local:
LAG ID: 2 WorkingMode: STATIC
Preempt Delay Time: 30 Hash arithmetic: According to SIP-XOR-DIP
System Priority: 32768 System ID: 4c1f-ccc1-6203
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
GigabitEthernet0/0/2 Selected 1GE 32768 3 561 10111100 1
GigabitEthernet0/0/3 Selected 1GE 32768 4 561 10111100 1
GigabitEthernet0/0/4 Unselect 1GE 0 5 561 10100000 1
GigabitEthernet0/0/5 Unselect 1GE 0 6 561 10100000 1
Partner:
--------------------------------------------------------------------------------
ActorPortName SysPri SystemID PortPri PortNo PortKey PortState
GigabitEthernet0/0/2 4096 4c1f-ccda-7331 0 3 305 10111100
GigabitEthernet0/0/3 4096 4c1f-ccda-7331 0 4 305 10111100
GigabitEthernet0/0/4 4096 4c1f-ccda-7331 32768 5 305 10100000
GigabitEthernet0/0/5 4096 4c1f-ccda-7331 32768 6 305 10100000
此时LSW1成为主，其设备上的端口优先级更小的1,2成为活动端口
所以，设备主从选举优先级比小，优先级相同，MAC地址比小。
活动端口选举，接口优先级比小，接口优先级相同，MAC地址比小。