This read-only Counter32 counts broadcast bytes, the number of bytes carried in broadcast frames, on Port 1 and Port 2 combined during this 15-minute long-term sample, with 4294967294 meaning unknown. An admin trends this alongside the paired percentage object to see not just the broadcast share of traffic but its absolute volume, since a small percentage of a high-traffic segment can still be a large number of broadcast bytes. For example, this broadcast byte count growing steadily across successive 15-minute long-term samples on Port 1 and Port 2 combined, even while overall utilization stays flat, would point to a growing number of chatty broadcast-based devices.