LACP details

Manual mode ：

As long as the interface is added to eth-trunk In the group
Then it will up, It only cares about itself and whether the opposite end up
If up, Then the member link will be up , hypothesis
A link in the link group is connected to other devices , it
I don't know at all. I still think I am in link aggregation ,
And the state is still up Of . Everything has to be confirmed by people
In the manual mode, you can only judge whether the opposite end can
Normal forwarding , For example, the peer interface is not configured IP Address , that
It still thinks that when the device interface at the opposite end up Of , But I don't know
In the network layer, the peer has no ability to forward data .

lacp Pattern ：

lacpdu Important content carried in ：
System priority
mac Address
Interface priority
Interface number

Be careful ： The number of active interfaces at both ends shall be consistent
Switch to switch through LACPDU Judge the priority
Then the election of the active end
System priority ： The lower the value, the higher the priority ,
mac Address ： The smaller the better

After the active end is elected , The active end elects active ports according to the information on its own interface
Interface priority ： The smaller the better
Interface number ： The smaller the better

The passive end selects the corresponding interface release according to the active interface selected by the active end

lacp There is an active interface threshold in mode , That is, when the port aggregation reaches a certain number , Extra ports
No more active interfaces , Instead, it will serve as a backup port

When lacp After the protocol detects that the port of the switch fails, the active end will automatically select the one with the highest priority , The election rules are the same as above , Then turn it into an active interface , The passive end follows the active end to release the corresponding backup interface .

See the link below for more details

What is? LACP？LACP How it works ？ - Huawei (huawei.com)