red-buffer-occupancy
Syntax
red-buffer-occupancy {
weighted-averaged [ instant-usage-weight-exponent exponent-value ];
}
Hierarchy Level
[edit chassis fpc slot-number pic pic-number ], [edit chassis lcc number fpc slot-number pic pic-number]
Description
Configure the IQ PIC to base random early detection (RED) queue management on a simple moving average buffer occupancy calculation. If you do not include this statement, the IQ PIC bases RED on an instantaneous buffer occupancy value. As an option, you can specify that the IQ PIC bases RED on a weighted moving average of buffer occupancy values.
If you configure this feature on a channelized OC12 intelligent queuing (IQ) PIC, the PIC reboots.
Options
weighted-averaged—Configure the IQ PIC to base RED processing on a
simple moving average of instantaneous buffer occupancy values instead of an
instantaneous buffer occupancy.
instant-usage-weight-exponent
exponent-value—(Optional) Specify the integer to be used
as the negative exponent of 2 to express a weight value. The PIC performs weighted
RED (WRED) by based on a calculation of average buffer occupancy that applies the
specified weight value to the instantaneous buffer occupancy and then factors the
weighted value into the calculation of average buffer occupancy. Valid exponent
range is from 1 through 31 (weight values from 2-1
through 2-31). If you do not specify this option, the default
exponent value is 0, which results in a weight value of 20 = 1. With a
weight value of 1, the calculation of weighted average buffer occupancy yields the
same value as the simple average buffer occupancy.
You can specify an exponent value greater than 31, and the value displays in the
output of show commands. However, the PIC replaces the
out-of-range value with the operational value of 31, which results in a
weight value of
2-31 = 1 / 231 = 0.0000000004656612873077392578125.
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 8.3.