This object specifies the bits in a 802 MAC source address that should be considered when performing a 802 MAC SA comparison against the address specified in the ntnL2MultiFieldClfrSrcAddr object. The value of this object represents a mask that is logically and'ed with the 802 MAC SA in received frames to derive the value to be compared against the ntnL2MultiFieldClfrSrcAddr address. A zero bit in the mask thus means that the corresponding bit in the address always matches. The ntnL2MultiFieldClfrSrcAddr value must also be masked using this value prior to any comparisons. The length of this object in octets must equal the length in octets of the ntnL2MultiFieldClfrSrcAddr. Note that a mask with no bits set (i.e., all zeroes) effectively wildcards the ntnL2MultiFieldClfrSrcAddr object. Version 1/2 attribute.