This counter tracks fragments received across the gamma interface and discarded because they would have overflowed the frame assembly buffer, per WT-159 attribute aEthRxOverflows, and can experience discontinuities at re-initialization. Admins monitor this to detect when incoming fragment volume is exceeding the reassembly buffer's capacity. For example, a rising overflow count suggests the bonded link's buffer is undersized for the current fragment rate, or that fragments are arriving faster than they can be reassembled.