Enterasys Networks X-Pedition XSR CLI User Manual

Page 490

Policy-Map Commands

12-94 Configuring Quality of Service

Syntax

random-detect dscp dscp-value min-thres max-thres [mark-prob]

Syntax of the “no” Form

The no form reverts WRED parameters to the default for a DSCP value:

no random-detect

Mode

Policy‐Map Class configuration:

XSR(config-pmap-c-<xx>)#

Defaults

•

Disabled

•

Default min‐threshold settings used by the

random-detect dscp

command are shown in the

following table. The default max‐threshold and mark‐probability are

and

1/10

respectively for

all DSCP values.

dscp-value

The DSCP value.

min-thres

Minimum limit of average packet queue length, ranging from 1 to 4096, beyond
which the XSR randomly drops packets.

max-thres

Maximum limit of average packet queue length, ranging from 1 to 4096,
beyond which all packets are dropped.

mark-prob

Mark probability denominator ranging from 1 to 65,536. This is the liklihood of
queued packets being dropped when their number exceeding the minimum
threshold is between 0 and (1/mark‐prob). When the maximum threshold is
reached, drop probability is 1 divided by the maximum probability.

Table 12-1 DSCP Threshold/Max Drop Probability Parameters

DSCP

Min Threshold

Max Threshold

Max Drop Probability

af11

1/10

af12

1/10

af13

1/10

Af21

1/10

Af22

1/10

Af23

1/10

Af41

1/10

Af31

1/10

Af32

1/10

Af33

1/10

Af42

1/10

Af43

1/10