Wred Configuration; Enabling Wred - 3Com 3C13636 Configuration Manual

Router 3000 ethernet family

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3Com Router 3000 Ethernet Family

Configuration Guide

incoming packets

Figure 4-1 Relation between WRED and Queue mechanism

Associating WRED with WFQ, the flow-based WRED can be realized. Because

different flow has its own queue during packet classification, the flow with small traffic

always has a short queue length, so the packet dropping probability will be small. The

flow with high traffic will have the longer queue length and will drop more packets, so

we can protect the benefits of the flow with small traffic.

4.2 WRED Configuration

WRED configuration includes:

Set WRED exponent for mean queue length calculation

Set WRED parameters for each precedence

Perform the following configuration in interface view.

Table 4-1 Enable WRED

Restore default

WRED cannot be used independently or with the queuing methods but WFQ.

By default, WRED is not used and the dropping method is tail drop.

queueN-1 weightN-1

queueN weightN

3Com Corporation

Chapter 4 Congestion Avoidance

queue1 weight1

queue2 weight2

undo qos wred

outgoing packets

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3c13636-us - router 3036 3000 series