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Hierarchy Level

[edit dynamic-profiles profile-name interfaces interface-name unit logical-unit-number family family],[edit dynamic-profiles profile-name interfaces demux0 unit logical-unit-number family family]

Release Information

Statement introduced in JUNOS 9.2.

Support for the $junos-loopback-interface predefined variable added in JUNOS Release 9.6.


For Ethernet interfaces, enable the local address to be derived from the specified interface. Configuring unnumbered Ethernet interfaces enables IP processing on the interface without assigning an explicit IP address to the interface. To configure unnumbered address dynamically, include the $junos-loopback-interface-address predefined variable.

You can configure unnumbered address support on Ethernet interfaces for IPv4 and IPv6 address families.


interface-name—Name of the interface from which the local address is derived. Use the $junos-loopback-interface dynamic variable to dynamically apply a loopback interface. The loopback interface used is based on the routing instance of the subscriber. The specified interface must have a logical unit number and a configured IP address, and must not be an unnumbered interface.

The preferred-source-address statement is explained separately.

Required Privilege Level

interface—To view this statement in the configuration.

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

Published: 2010-04-15

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