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loopback

See the following sections:

loopback (ADSL, DS0, E1/E3, SONET/SDH, SHDSL, and T1/T3)

Syntax

loopback (local | payload | remote);

Hierarchy Level

[edit interfaces interface-name ds0-options],
[edit interfaces interface-name dsl-options],
[edit interfaces interface-name e1-options],
[edit interfaces interface-name e3-options],
[edit interfaces interface-name shdsl-options},
[edit interfaces interface-name sonet-options],
[edit interfaces interface-name t1-options],
[edit interfaces interface-name t3-options]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

Configure a loopback connection. To turn off the loopback capability, remove the loopback statement from the configuration.

Options

local—Loop packets, including both data and timing information, back on the local routing platform’s PIC. NxDS0 IQ interfaces do not support local loopback.

payload—For channelized T3, T1, and NxDS0 IQ interfaces only, loop back data only (without clocking information) on the remote routing platform’s PIC. With payload loopback, overhead is recalculated. Neither ATM-over-asymmetrical digital subscriber line (ADSL) interfaces nor ATM-over-SHDSL interfaces support payload loopback.

remote—Loop packets, including both data and timing information, back on the remote routing platform’s interface card. NxDS0 IQ interfaces do not support remote loopback. ATM-over-ADSL interfaces do not support payload loopback.

Usage Guidelines

See Configuring E3 and T3 Parameters on ATM Interfaces, Configuring E1 Loopback Capability, Configuring E3 Loopback Capability, Configuring SONET/SDH Physical Interface Properties, Configuring SHDSL Operating Mode on an ATM Physical Interface, Configuring T1 Loopback Capability, and Configuring T3 Loopback Capability.

Required Privilege Level

interface—To view this statement in the configuration.

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

Related Topics

feac-loop-respond

loopback (Aggregated Ethernet, Fast Ethernet, and Gigabit Ethernet)

Syntax

(loopback | no-loopback);

Hierarchy Level

[edit interfaces interface-name aggregated-ether-options],
[edit interfaces interface-name fastether-options],
[edit interfaces interface-name gigether-options]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

For aggregated Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet interfaces, enable or disable loopback mode.

Note: By default, local aggregated Ethernet, Fast Ethernet, Tri-Rate Ethernet copper, Gigabit Ethernet, and 10-Gigabit Ethernet interfaces connect to a remote system.

Usage Guidelines

See Configuring Ethernet Loopback Capability.

Required Privilege Level

interface—To view this statement in the configuration.

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

loopback (Serial)

Syntax

loopback mode;

Hierarchy Level

[edit interfaces interface-name serial-options]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

Configure a loopback connection.

Default

If you do not include this statement, there is no loopback connection.

Options

mode—You can specify the one of the following loopback modes:

Usage Guidelines

See Configuring Serial Loopback Capability.

Required Privilege Level

interface—To view this statement in the configuration.

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

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