https://www.theverge.com/circuitbreaker/2018/1/3/16845134/asus-aimesh-mesh-network-router-firmware-update

Mesh routers like Eero, Netgear’s Orbi, and Google Wifi are getting all the hype these days, but replacing your whole network with a bunch of new devices can be kind of expensive. Asus has a good solution with its new AiMesh system, which lets you repurpose your existing Asus routers as part of a mesh network.

For now, the mesh support is coming to a few routers today in beta, including the ASUS RT-AC68U, RT-AC1900P, RT-AC86U, RT-AC5300, and the ROG Rapture GT-AC5300. with additional support planned for the RT-AC88U and RT-AC3100 later this year.