Weighted RED (WRED) applies different RED profiles to traffic classes. Low priority drops earlier than high priority.
WRED configuration:
- Define thresholds per DSCP value
- Higher priority has higher thresholds
- Lower priority starts dropping sooner
Example profiles:
- AF41: min , max
- AF21: min , max
- Default: min , max
When congestion builds, best effort drops first, then medium, then high priority. Priority traffic experiences less loss during moderate congestion.
Each AF class has drop precedences. AF13 drops before AF11 within the same class.