This tracks the byte total, rather than packet count, for the internal non-recursive accounting bucket associated with this prefix. Pairing this with cefPrefixInternalNRPkts lets an admin compute average packet size specifically for internally-resolved traffic to this prefix, distinct from whatever the externally-resolved, recursive, traffic to related prefixes looks like. If this byte counter grows much faster relative to its packet counterpart than expected, it would suggest internally-resolved traffic to this prefix is carrying unusually large packets, such as bulk transfers rather than typical mixed traffic.