The number of destination prefixes to which DC-RTM currently has a route. This is the same as the number of rows in the rtmRouteTable if the following are both true. - Either rtmEntityEqlCostOpt is set to 'one', or DC-RTM knows of at most one route to each destination prefix. This means that there is at most one route in rtmRouteTable for each destination prefix included in rtmEntityRouteNumber. - None of the routes which DC-RTM has learned about are loose next hops that cannot be resolved. This means that there is at least one route in rtmRouteTable per destination prefix included in rtmEntityRouteNumber.