Use both 2.4 and 5GHz with relay

Installing and Using OpenWrt Network and Wireless Configuration
1

I've correctly configured my tplink Archer C6 AC1200 to use relay and I've interfaced it to my main router with 5GHz WiFi (chip Qualcomm Atheros QCA9886 802.11acn). I previously tested also with 2.4GHz wifi ( Generic 802.11bgn) and both ways work fine.

My question is: is it possible to use relay with both 2.4GHz and 5GHz (my main router has the same SSID for both channels)?

My current interfaces are

Screenshot (14)
Screenshot (14)973×435 33.1 KB

What's the best way to implement the 2.4+5GHz relay? Is it better to have two different relay interfaces that link each wireless interface to the LAN one or only one relay interface that receives both Wi-Fi interfaces?

2

No it will create a layer 2 loop.

Many clients still don't support 5GHz band. So the best would be to use 5GHz for the wwan uplink and the 2,4GHz+5GHz for relay access point.

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3

I'm connected to the "bridged" router via a cable so, I don't really care if the clients can or not access 5GHz as the Wi-Fi will be used only to "create" the bridge between my main router and the relay-ed one

4

Then it doesn't really matter. If you can achieve good connection over 5GHz, it provides better throughput compared to 2,4GHz. Otherwise 2,4GHz has better penetration and can reach further.

5

But the question was if is there a way to use 2.4+5GHz on the "bridged" Wi-Fi to increase the max bandwidth. Like the router autonomously use both to increase the downlink (the uplink is already capped at 100Mbps because the ISP)

6

I answered that already.