3-14.14 Wred - ZyXEL Communications XGS3600 Series Manual

3-14.14 WRED

This page allows you to configure the Random Early Detection (RED) settings for queue 0 to
5. RED cannot be applied to queue 6 and 7.
Through different RED configuration for the queues (QoS classes) it is possible to obtain
Weighted Random Early Detection (WRED) operation between queues.
The settings are global for all ports in the switch.
RED Drop Probability Function
The following illustration shows the drop probability function with associated parameters.
Max. DP 1-3 is the drop probability when the average queue filling level is 100%. Frames
marked with Drop Precedence Level 0 are never dropped. Min. Threshold is the average
queue filling level where the queues randomly start dropping frames. The drop probability for
frames marked with Drop Precedence Level n increases linearly from zero (at Min. Threshold
average queue filling level) to Max. DP n (at 100% average queue filling level).
Web Interface
To configure the Weighted Random Early Detection Configuration parameters in the web
interface:
1. Click Configuration, QoS, WRED Configuration
2. Evoke to enable WRED
3. Specify Min. Threshold, Max. DP 1, Max. DP 2, Max. DP 3
4. Click the Apply to save the setting
5. If you want to cancel the setting then you need to click the Reset button.
It will revert to previously saved values
XGS3600 Series User's Guide
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