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堆叠的三大优势

1. 提高资源利用率，获得更高的转发性能、链路带宽
2. 降低网络规划的复杂度、方便网络的管理
3. 降低故障对业务的影响时间

堆叠的两个需求

1. 设备型号必须统一
2. 系统版本必须统一

华三堆叠案例：

#### S6850_1
<H3C>sy
[H3C]undo in en 
[H3C]sy SW1
[SW1]int Ten-GigabitEthernet 1/0/49
[SW1-Ten-GigabitEthernet1/0/49]shutdown 
[SW1-Ten-GigabitEthernet1/0/49]quit 
[SW1]irf member 1 priority 30
[SW1]irf-port 1/1
[SW1-irf-port1/1]port group interface Ten-GigabitEthernet 1/0/49
[SW1-irf-port1/1]q
[SW1]irf-port-configuration active 
[SW1]interface Ten-GigabitEthernet 1/0/49
[SW1-Ten-GigabitEthernet1/0/49]undo shutdown 
[SW1]save 
[SW1]qu
<SW1>reboot 

#### S6850_2
<H3C>sy
[H3C]sy SW2
[SW2]int Ten-GigabitEthernet 1/0/49
[SW2-Ten-GigabitEthernet1/0/49]shutdown 
[SW2-Ten-GigabitEthernet1/0/49]quit 
[SW2]irf member 1 renumber 2
[SW2]irf-port 1/2
[SW2-irf-port1/2]port group interface Ten-GigabitEthernet 1/0/49
[SW2-irf-port1/2]qu
[SW1]irf-port-configuration active
[SW2]int Ten-GigabitEthernet 1/0/49
[SW2-Ten-GigabitEthernet1/0/49]undo shutdown 
[SW2-Ten-GigabitEthernet1/0/49]q
[SW2]sa
[SW2]qu
<SW2>reboot

命令查询状态

dis irf

华为的堆叠配置

华为eNSP无法实现堆叠，本次使用真机演示，拓扑图如下

#### 主
[Huawei]sy SW1	
[SW1]stack slot 0 priority 120 //优先级为120
[SW1] interface stack-port 0/1
[SW1-stack-port0/1] port interface gigabitethernet 0/0/20 enable

#### 备
[Huawei]sy SW2	
[SW2]stack slot 0 renumber 1 //配置SW2的堆叠ID为1。
[SW2] interface stack-port 0/2
[SW2-stack-port0/2] port interface gigabitethernet 0/0/20 enable

<SW1> display device
S5735-L24P4S-A's Device status:
Slot Sub  Type                Online    Power      Register     Status   Role
-------------------------------------------------------------------------------
0    -   S5735-L24P4S-A         Present   PowerOn    Registered   Normal   Master
1    -   S5735-L24P4S-A         Present   PowerOn    Registered   Normal   Standby
al   Master
1    -   S5735-L24P4S-A         Present   PowerOn    Registered   Normal   Standby