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：

================================
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-group  1 mode on         <1-64>
exit
interface port-channel 1
no shutdown
switchport mode trunk encapsulation dot1q
switchport trunk allow vlan 100,10-13
=================================
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-group  1 mode on <1-6>
exit
interface port-channel 1
no shutdown
switchport mode trunk encapsulation dot1q
switchport trunk allow vlan 100,10-13