Description: Index of the router for which the multicast flows are available, that is the flows would be replicated and routed by the specified router, should the flows did not get switched. This object should be instantiated and set whenever the 'router' bit of the asociated cseFlowMcastQueryMask object is on. If the 'router' bit is set, and a router's IP address is assigned to this object, then only flows associated with that router will be contained in the result table. If the 'router' bit in the cseFlowMcastQueryMask object is cleared, this object is ignored during the query, and all flows will be considered regardless of the routers being switched.