Wred - D-Link xStack Reference Manual

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xStack DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
The following parameters can be configured:
Parameter
Unit
From Port / To Port
Scheduling Mechanism
Click the Apply button to accept the changes made.
NOTE: The settings you assign to the queues, numbers 0-7, represent the IEEE 802.1p priority
tag number. Do not confuse these settings with port numbers.

WRED

WRED or Weighted Random Early Detection is another implementation for QoS that will help the overall throughput
for your QoS queues. Based on the egress queue of the QoS function set on the Switch, this method will analyze
these packets and their QoS queue to determine if there will be an overflow of packets entering the QoS queues
and consequentially, minimize the packet flow into these queues by dropping random packets. WRED employs two
methods of avoiding congestion within the QoS queue.
1. Every QoS queue has a minimum and a maximum level for acceptance of packets. Once the maximum
Figure 7-12. QoS Scheduling Mechanism window
Description
Select the switch unit to configure.
Enter the port or port list you wish to configure.
Strict – The highest class of service is the first to process traffic. That is, the highest
class of service will finish before other queues empty.
Weighted Round Robin – Use the weighted round-robin algorithm to handle
packets in an even distribution in priority classes of service.
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