This read-only Counter64 records the total number of packets, including malformed ones, received that were between 128 and 255 octets inclusive, per its description, another rung in this bin's frame-size distribution histogram. Frames in this range often correspond to encrypted or encapsulated small payloads, like VoIP with certain codecs, or tunneled control traffic, so tracking this bucket's share of total packets over successive bins can reveal a shift in the underlying traffic mix over time. An engineer noticing a gradual increase in this bucket's share across daily bins might correlate it with the rollout of a new small-payload application or protocol on that port.