confMaxDvmrpRoutes sets the maximum number of DVMRP multicast routes this router will handle, per its description "Limits the number of DVMRP routes handled by the router". An admin tunes this to cap DVMRP route-table growth on the router, protecting memory and CPU resources on a device that might otherwise learn an unbounded number of multicast source or group routes. For example, lowering confMaxDvmrpRoutes to 5000 on a smaller router would cause it to stop accepting additional DVMRP routes once that limit is reached, rather than risk exhausting its routing table.