This object is used to specify the number of leading one
bits which from the mask to be logical-ANDed with the media
gateway address before being compared to the value in the
cmgwIpCofigAddress.
Any assignment (implicit or otherwise) of an instance of
this object to a value x must be rejected if the bitwise
logical-AND of the mask formed from x with the value
of the corresponding instance of the cmgwIpCofigAddress
object is not equal to cmgwIpCofigAddress.