端口聚合协议(PAgP)--------思科私有
和链路聚合控制协议（LACP）---------IEEE 802.3ad
PAgP模式
desirable：主动询问对端是否参与
Auto：被动等待对端
| SW1 | SW2 | channel establishment |
| on | on | yes |
| auto/desirable | desirable | yes |
| on/auto/desirable | no configured | no |
| on | desirable | no |
| auto/on | auto | no |
LACP模式
Active:主动询问另一端是否能参与
Passive:被动等候另一端
| SW1 | SW2 | channel establishment |
| on | on | yes |
| acitve/passive | active | yes |
| on/active/passive | no configured | no |
| on | active | no |
| passive/on | passive | no |
基于LACP配置ehterchannel
SW1
S1(config)#interface range fa0/1-2
S1(config-if-range)#channel-group 1 mode active
S1(config-if-range)#interface port-channel 1
S1(config-if)#switchport trunk encapsulation dot1q
S1(config-if)#switchport mode trunk
S1(config-if)#switchport trunk allowed vlan all
SW2
S2(config)#interface range fa0/1-2
S2(config-if-range)#channel-group 1 mode active
S2(config-if-range)#interface port-channel 1
S2(config-if)#switchport trunk encapsulation dot1q
S2(config-if)#switchport mode trunk
S2(config-if)#switchport trunk allowed vlan all
验证
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原文：http://ljclee.blog.51cto.com/9538192/1606829