Create LAG for the LAN


I'm using openWRT with Linksys WRT3200ACM.
The version is : OpenWrt 19.07.3 r11063-85e04e9f46 / LuCI openwrt-19.07 branch git-20.182.58453-b573f10
I have a configuration with LAN, DMZ, WAN...

I would like to create a LAG for the LAN with 2 ports on the WRT3200ACM.
I followed 2 tutorials on internet but it didn't work...

In the current state :
Port1 : connected to a switch to serve LAN (vlan1)
Port2 : connnected to a domotic box (vlan1)
Port3 : unused.
Port4 : connected to a switch to serve DMZ (vlan5)

I would like to make a LAG with port 1 and 3.!

Here is my /etc/config/network :
Sans titre|209x500

Thanks for your help

The best way to think about these kinds of devices is as a little computer permanently wired into a switch. In this case the wrt3200 has two ethernet interfaces permanently wired in... eth0 and eth1.

I don't think these switch chips have any support for link aggregation. In a standard managed switch you'd need TWO LAGs one to aggregate eth0 and eth1 and one to aggregate switch port 1 and 3.

I'm not sure if the wrt3200 has switched to a DSA based build but if so I'm taken to understand that it can't even use eth1 in that config.

Basically... I don't think anything useful comes of trying to lag two ports. What were you trying to accomplish? Redundancy/fallback might still be doable, but higher than gigabit speeds doesn't seem super likely.