Indicate the mask to be logical-ANDed with the destination address before being compared to the value in the fsIpRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value of the fsIpRouteMask by reference to the IP Ad- dress Class. Any assignment (implicit or otherwise) of an instance of this object to a value x must be rejected if the bitwise logical-AND of x with the value of the corresponding instance of the fsIpRouteDest object is not equal to fsIpRoute- Dest.