写给自己：
1.这里是纯三层链路聚合的配置方法，没有具体实验
2.要多进行试验来练习
三层链路聚合配置
[RTA]interface eth-trunk 1
[RTA-Eth-Trunk1]undo portswitch
[RTA-Eth-Trunk1]ip address 100.1.1.1 24
[RTA-Eth-Trunk1]quit
[RTA]interface GigabitEthernet 0/0/1
[RTA-GigabitEthernet0/0/1]eth-trunk 1
[RTA-GigabitEthernet0/0/1]quit
[RTA]interface GigabitEthernet0/0/2
[RTA-GigabitEthernet0/0/2]eth-trunk 1
[RTA-GigabitEthernet0/0/2]quit