This Counter64 field reports the bytes transmitted per second on the reverse direction of this bidirectional CES tunnel, as computed for this PM instance. Because this row is a closed, already-completed measurement interval kept in the CES-PM history table — a fixed, immutable snapshot of one specific past window, and this specific field is an instantaneous computed rate of transmitted egress traffic rather than a running total, so a spike here shows up the moment it happens rather than only after the interval ends, it is the field to check when you need to see the reverse-direction egress throughput of the tunnel right now rather than a cumulative volume. For example, this counter might read 3,198 bytes/sec during the most recently completed 15-minute bin — a sudden jump to several times that on the reverse side, with no matching rise on the other direction, would point to a one-way traffic surge or an attack riding that leg of the tunnel.