Current rate, in bytes per second, at which low-drop-precedence traffic is being RED-dropped from a specific output queue on a logical interface (ifl/child interface) in jnxCosIfsetQstatTable, rather than the whole physical interface under tri-color marking. (Juniper's own DESCRIPTION text for this counter says "TCP bytes", but that wording is copy-pasted from the TCP-specific byte counters above it in the same table; by object name and table position this is the tri-color drop-precedence counter, which is not protocol-specific.)