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epd-threshold

See the following sections:

epd-threshold (Logical Interface)

Syntax

epd-threshold cells plp1 cells;

Hierarchy Level

[edit interfaces interface-name unit logical-unit-number],
[edit interfaces interface-name unit logical-unit-number address address family family multipoint-destination address],
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number],
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number address address family family multipoint-destination address]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

For ATM2 IQ interfaces only, define the early packet discard (EPD) threshold on a VC. The EPD threshold is a limit on the number of transmit packets that can be queued. Packets that exceed the limit are discarded. This threshold applies to packets that have a packet-loss priority (PLP) of 0.

Default

Approximately 1 percent of the available cell buffers. If shaping is enabled, the default EPD threshold is proportional to the shaping rate according to the following formula:

default epd-threshold = number of buffers * shaping rate / line rate

The minimum EPD threshold value is 48 cells. If the default EPD threshold formula results in an EPD threshold of less than 48 cells, the result will be ignored, and the minimum value of 48 cells will be used.

Options

cells—Maximum number of cells.

Range: For 1-port and 2-port OC12 interfaces, 48 through 425,984 cells.

Usage Guidelines

See Configuring the ATM2 IQ EPD Threshold.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

epd-threshold (Physical Interface)

Syntax

epd-threshold cells plp1 cells;

Hierarchy Level

[edit interfaces at-fpc/pic/port atm-options scheduler-maps map-name forwarding-class class-name]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

For ATM2 IQ interfaces only, define the EPD threshold on a VC. The EPD threshold is a limit on the number of transmit packets that can be queued. Packets that exceed the limit are discarded.

Default

If you do not include either the epd-threshold or the linear-red-profile statement in the forwarding class configuration, the JUNOS software uses an EPD threshold based on the available bandwidth and other parameters.

Options

cells—Maximum number of cells.

Range: For 1-port and 2-port OC12 interfaces, 48 through 425,984 cells. For 1-port OC48 interfaces, 48 through 425,984 cells. For 2-port OC3, DS3, and E3 interfaces, 48 through 212,992 cells. For 4-port DS3 and E3 interfaces, 48 through 106,496 cells.

The plp1 statement is explained separately.

Usage Guidelines

See Configuring an ATM Scheduler Map.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Related Topics

linear-red-profile

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