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Defining Drop Profiles

A drop profile is a feature of the random early detection (RED) process that allows packets to be dropped before queues are full. Drop profiles are composed of two main values—the queue fullness and the drop probability. For more information on drop profiles, see .

To configure drop profiles using the J-Web configuration editor:

  1. Select Configure>Class of Service>Drop Profile.

    The RED drop profiles summary page appears.

  2. Fill in the options as shown in Table 150.
  3. Click one of the following buttons:

Table 150: RED Drop Profile Configuration Options




Red Drop Profiles

Drop profile name

Displays the configured random early detection (RED) drop profile names.


Profile type

Displays whether a RED drop profile type is interpolated or segmented.


Data points

Displays information about the data point types.



Opens a page that allows you to add a RED drop profile.

To create a new RED drop profile, click Add.


Opens a page that allows you to edit a RED drop profile.

To edit an existing profile, select the profile in the summary page and click Edit.


Removes selected RED drop profiles.

To remove an existing profile, select the profile and click Delete.

Add RED Drop Profile/Edit RED Drop Profile

Drop profile name

Specifies a name for a drop profile.

A drop profile consists of pairs of values between 0 and 100, one for queue buffer fill level and one for drop probability, that determine the relationship between a buffer's fullness and the likelihood it will drop packets. The values you assign to each pair must increase relative to the previous pair of values. With a few value pairs, the system automatically constructs a drop profile.

To name a drop profile, type the name—for example, be-normal.

RED drop profile type

Specifies whether a RED drop profile type is segmented or interpolated.

  • Segmented—The value pairs are represented by line fragments, which connect each data point on the graph to produce a segmented profile.
  • Interpolated—The value pairs are interpolated to produce a smooth profile.

Select Segmented or Interpolated.


Opens a page that allows you to add the specified queue buffer fill level and drop probability as a data point for the graph.

To add fill level and drop probability, click Add.

Data point

Specifies the points for generating the RED drop profile graph. Each data point is defined by a pair of x and y coordinates and represents the relationship between them.

The x axis represents the queue buffer fill level, which is a percentage value of how full the queue is. A value of 100 means the queue is full.

The y axis represents the drop probability, which is a percentage value of the chances of a packet being dropped. A value of 0 means that a packet is never dropped, and a value of 100 means that all packets are dropped.

To specify x and y coordinates for data points, type a number between 0 and 100 in the following boxes:

  • Fill level—Type the percentage value of queue buffer fullness for the x coordinate—for example, 95.
  • Drop profile—Type the percentage value of drop probability for the y coordinate—for example, 85.

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