unnumbered-address (Dynamic Profiles)

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 9.2.

$junos-preferred-source-address variable support added in Junos OS Release 9.6.

Support for the $junos-loopback-interface predefined variable introduced in Junos OS Release 9.6.

Description

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.

Options

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.

preferred-source-address address—(Optional) Secondary IP address of the donor loopback interface. Use the $junos-preferred-source-address dynamic variable to dynamically apply a preferred source address to the unnumbered Ethernet interface. When you use the dynamic variable, the address that is selected resides in the same network as the IP address of the subscriber. Configuring the preferred source address enables you to use an IP address other than the primary IP address on some of the unnumbered Ethernet interfaces in your network

Required Privilege Level

interface—To view this statement in the configuration.

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