Wred Command List - D-Link DES-3852 - xStack Switch - Stackable Cli Manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual
WRED or Weighted Random Early Discard 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 threshold has been
reached for this queue, the Switch will begin discarding all ingress packets, this minimizing the allotted bandwidth for QoS.
When below the minimum threshold, the switch will accept all ingress packets.
2. When the ingress packets are somewhere between the maximum and minimum queue, the Switch will use a slope probability
function to determine a random method of dropping packets based on the fill percentage of the QoS queue. If queues are
closer to being full, the Switch will increase the discarding of random packets to even out the flow to the queues and avoid
overflows to higher priority queues.
Command
enable wred
disable wred
config wred ports
show wred
Each command is listed, in detail, in the following sections.
enable wred
Purpose
Syntax
Description
Parameters
Restrictions
Example usage:
To enable WRED switch wide.
DES-3800:admin#enable wred
Command: enable wred
Success.
DES-3800:admin#
Parameters
[<portlist> | all] [class_id <class_id 0-7> {drop_start <int 0-100>| drop_slope
<int 0-90>} | {drop_start <int 0-100> | drop_slope <int 0-90> | average_time
<int 1-32768>}]
{ports [<portlist> | all]}
Used to enable WRED on the Switch.
enable wred
This command, along with the disable wred command will enable and
disable the Weighted Random Early Discard (WRED) mechanism on the
Switch.
None.
Only Administrator or Operator-level users can issue this command.
WRED C
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