cisco 3550和 cisco 2950的链路聚合
3550支持3层和2层链路聚合，支持协议lacp（IEEE）和pagp（思科私有）；而2950只支持pagp。故只能使用pagp.在配置2层链路聚合时候，组成port-channel接口的以太口下配置都得一致。配置命令：
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3550：
enable
conf t
int range f0/9 - 10
no shut
switchport mode trunk encapsulation dot1q
switch mode trunk allow vlan add 100,10-13
channel-protocol pagp <pagp/lacp>
channel-group1 mode on <1-64>
exit
interface port-channel 1
no shutdown
switchport mode trunk encapsulation dot1q
switchport trunk allow vlan 100,10-13
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2950:
en
conf t
int range f0/9 - 10
no shut
switchport mode trunk encapsulation dot1q
switch mode trunk allow vlan add 100,10-13
channel-protocol pagp <pagp/lacp>
channel-group1 mode on <1-6>
exit
interface port-channel 1
no shutdown
switchport mode trunk encapsulation dot1q
switchport trunk allow vlan 100,10-13
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