Configuration Guide 126
Configuring LAG Configuration Example
3.4 Using the CLI
The configurations of Switch A and Switch B are similar. The following introductions take
Switch A as an example.
1) Configure the load-balancing algorithm as “src-dst-mac”.
Switch#configure
Switch(config)#port-channel load-balance src-dst-mac
2) Specify the system priority of Switch A as 0. Remember to ensure that the system
priority value of Switch B is bigger than 0.
Switch(config)#lacp system-priority 0
3) Add ports 1/0/1-8 to LAG 1 and set the mode as LACP. Then specify the port priority as
0 to make them active.
Switch(config)#interface range gigabitEthernet 1/0/1-8
Switch(config-if-range)#channel-group 1 mode active
Switch(config-if-range)#lacp port-priority 0
Switch(config-if-range)#exit
4) Add port 1/0/9 to LAG 1 and set the mode as LACP. Then specify the port priority
as 1 to set it as a backup port. When any of the active ports is down, this port will be
preferentially selected to work as an active port.
Switch(config)#interface gigabitEthernet 1/0/9
Switch(config-if)#channel-group 1 mode active
Switch(config-if)#lacp port-priority 1
Switch(config-if)#exit
5) Add port 1/0/10 to LAG 1 and set the mode as LACP. Then specify the port priority as 2
to set it as a backup port. The priority of this port is lower than port 1/0/9.
Switch(config)#interface gigabitEthernet 1/0/10
Switch(config-if)#channel-group 1 mode active
Switch(config-if)#lacp port-priority 2
Switch(config-if)#end
Switch#copy running-config startup-config
Verify the Configuration
Verify the system priority:
Switch#show lacp sys-id
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