堆疊的三大優勢

1. 提高資源利用率，獲得更高的轉發性能、鏈路帶寬
2. 降低網絡規劃的復雜度、方便網絡的管理
3. 降低故障對業務的影響時間

堆疊的兩個需求

1. 設備型號必須統一
2. 系統版本必須統一

華三堆疊案例：

#### 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

命令查詢狀態

dis irf

華為的堆疊配置

華為eNSP無法實現堆疊，本次使用真機演示，拓撲圖如下

#### 主
[Huawei]sy SW1	
[SW1]stack slot 0 priority 120 //優先級為120
[SW1] interface stack-port 0/1
[SW1-stack-port0/1] port interface gigabitethernet 0/0/20 enable

#### 備
[Huawei]sy SW2	
[SW2]stack slot 0 renumber 1 //配置SW2的堆疊ID為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