Using all in one as just a router?

[RoShamBo123]

I have modem/router combo from TWC, and a new router (ASUS RT-AC87U). The combo'd router is pretty terrible. If I bridge the separate router with the combo, will it disable the combo'd router or will it use both?

 

[Paul NZ]

I think you have to disable DHCP in the modem/router to use a separate router