Why the APs connected are not even for 3 units AC with VAC?

Problem Description：

There are three ACs on a VAC, but APs are all connected to one of the AC.




Topology：







Troubleshooting Step：
1. Check the aggregate port setting on core switch. Need set its load balance by source IP and destination IP. You can use the following command to configure it.

Ruijie#configure ter
Ruijie (config)#aggregateport load-balance src-dst-ip
Ruijie (config)#end
Ruijie#wr

2. Check whether core-switch is on VSU mode. If yes,you to disable local priority forwarding by using the following command:Ruijie#configure ter

Ruijie(config)#switch virtual domain 1    # 1 is the domain-id of VSU
Ruijie(config-vs-domain)#no switch virtual aggregateport-lff enable
Ruijie(config-vs-domain)#end
Ruijie#wr

Verification:
After setting, APs load balance successfully
, you can see the following result: