Technical Documentation

unnumbered-address (Demux)


unnumbered-address interface-name <preferred-source-address address>;

Hierarchy Level

[edit interfaces interface-name unit logical-unit-number family inet],[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number family inet]

Release Information

Statement introduced in JUNOS Release 8.2.

preferred-source-address option introduced in JUNOS Release 9.0.

IP demultiplexing interfaces supported in JUNOS Release 9.2.


For IP demultiplexing interfaces, enable the local address to be derived from the specified interface. Configuring an unnumbered interface enables IP processing on the interface without assigning an explicit IP address to the interface.


interface-name—Name of the interface from which the local address is derived. 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: 2010-04-20