This read-create INTEGER, as a percentage from 0 to 100, sets the tail-drop threshold for traffic marked with Drop Precedence 2, typically the least-protected drop class. An admin usually sets this to the lowest threshold among the three DP classes, so DP2 traffic is discarded earliest during congestion, protecting the higher-precedence classes. For example, setting this threshold to 60 percent means DP2 traffic starts getting tail-dropped once the queue reaches 60 percent full, well before DP0 or DP1 traffic is affected.