MAC DSAP mask for this policy MAC filter entry. use 0 to disable
matching by this criteria. This object has no significance if the
object tMacFilterParamsFrameType is not set to 802dot2LLC.
In order to reset the value to the default value, both objects
tMacFilterParamsDsap and tMacFilterParamsDsapMask need to be modified
together to the default value.