An address mask that when used with the
lesAtmAddrSpec specifies the portion of the LES' ATM
address that is desired to be configured. Note that
setting this object will result in the
reinitialization of the LES,consequently dropping all
clients connected to it. Note that this object cannot
be set at row creation time without also supplying a
value for the lesAtmAddrSpec object. If the LES ATM
address is omitted at creation time then this object
defaults to the value of all zeros (none of the
lesAtmAddrSpec value is relevant). If the LES ATM
address is specified at creation time but this object
omitted, then this object defaults to the value of all
ones (all of the lesAtmAddrSpec is relevant).