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WRED Command List, enable wred

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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual 51 WRED COMMAND LIST 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 Parameters enable wred disable wred config wred ports show wred [ | all] [class_id {drop_start | drop_slope } | {drop_start | drop_slope | average_time }] {ports [ | all]} Each command is listed, in detail, in the following sections. enable wred Purpose Syntax Description Parameters Restrictions 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. Example usage: To enable WRED switch wide. DES-3800:admin#enable wred Command: enable wred Success. DES-3800:admin# 349

Section	Page
INTRODUCTION	5
Using the Console CLI	7
Command Syntax	11
Basic Switch Commands	13
Switch Port Commands	31
SNMP V3	35
PoE Commands	49
Network Management Commands	54
Switch Utility Commands	62
Network Monitoring Commands	73
Layer 2 FDB Commands	86
Packet Storm Control Commands	94
QoS Commands	98
Mirror Configuration Commands	106
VLAN Commands	109
Link Aggregation Commands	123
IGMP Snooping Commands	127
802.1X Commands (Including Guest VLANs)	135
Access Control List (ACL) Commands	148
Traffic Segmentation Commands	168
Command List History	170
Basic IP Commands (For Layer 3)	173
ARP Commands	178
Routing Table Commands	182
Route Redistribution Commands	185
RIP Commands	191
IGMP Commands	195
Auto Config Commands V3	199
DNS Relay Commands	201
DVMRP Commands	205
IP Multicasting Commands	210
MD5 Commands	213
OSPF Configuration Commands	215
Time and SNTP Commands	232
Port Security Commands	238
MAC Notification Commands	242
SSH Commands	246
Jumbo Frame Commands	254
Access Authentication Control Commands	256
D-Link Single IP Management Commands	279
Multiple Spanning Tree Protocol (MSTP) Commands	289
SSL Commands	301
VRRP Commands	307
System Severity	316
DHCP Relay	318
IP-MAC Binding Commands	324
LACP Configuration Commands	338
CPU Interface Filtering (Software ACL) Commands	340
Modify Prompt and Banner Commands	348
Safeguard Engine	351
WRED Command List	353
Web-based Access Control (WAC) Commands	357
Double VLAN Command List	363
Limited Multicast IP Address Commands	368
Route Preference Commands	373
MAC-Based Access Control Commands	376
PIM Commands	385
Loopback Interface Commands	402
DHCP Server Command List	405
MLD Snooping Commands	421
Loopback Detection Commands	428
Password Recovery Commands	433
Multicast VLAN Commands	436
CPU Filtering Commands List	439
Broadcast Segmentation Commands	441
Technical Specifications	443

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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual

349

WRED

OMMAND

IST

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.

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.

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

Parameters

enable wred

disable wred

config wred ports

[<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>}]

show wred

{ports [<portlist> | all]}

Each command is listed, in detail, in the following sections.

enable wred

Purpose

Used to enable WRED on the Switch.

Syntax

enable wred

Description

This command, along with the

disable wred

command will enable and

disable the Weighted Random Early Discard (WRED) mechanism on the

Switch.

Parameters

None.

Restrictions

Only Administrator or Operator-level users can issue this command.

Example usage:

To enable WRED switch wide.

DES-3800:admin#enable wred

Command: enable wred

Success.

DES-3800:admin#