This read-write enumerated integer sets a bit-mask representing the routing mode of a module, ranging from pure secondLayer(1) L2 switching with no routing, through ez2route(3) which requires no configuration and simply boosts external routers, to full router(5) behavior acting like a third-layer switch, up to routerAndWebSwitch(21) which adds load-balancing and application redirection on top of routing. An admin sets this per module to match the role that module should play in the chassis, since it fundamentally changes whether the module routes traffic itself or defers to another device. For example, an admin wanting a module to purely accelerate an existing external router without any configuration would set routeGroupRouteMode to ez2route(3) rather than router(5).