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Loopback Interface Configuration Command Set Command Reference Guide

ip unnumbered <interface>

Use the ip unnumbered command to use the IP address assigned to the specified interface for all IP

processing on the active interface. Use the no form of this command to remove the unnumbered

configuration.

Syntax Description

Specifies the interface (in the format

type slot/port

) that contains the IP address

to be used as the source address for all packets transmitted on this interface

Valid interfaces include: Ethernet (eth 0/1), virtual frame relay sub-interfaces (fr

1.16), virtual PPP interfaces (ppp 1), and loopback interfaces.

Default Values

By default, all interfaces are configured to use a specified IP address (using the ip address command).

Command Modes

(config-interface)# Interface Configuration Mode required

Valid interfaces include: Ethernet (eth 0/1), virtual frame relay sub-interfaces (fr

1.16), virtual PPP interfaces (ppp 1), and loopback interfaces

Command History

Release 1.1 Command was introduced

Functional Notes

ip unnumbered

is enabled on an interface, all IP traffic from the interface will use a source IP address taken

from the specified interface. For example, specifying

ip unnumbered ppp 1

while in the Ethernet Interface

Configuration Mode configures the Ethernet interface to use the IP address assigned to the PPP interface for

all IP processing. In addition, the ADTRAN OS uses the specified interface information when sending route

updates over the unnumbered interface.

Usage Examples

The following example configures the loopback interface (labeled

loop

) to use the IP address assigned to

the PPP interface (

ppp 1

(config)#

interface loopback 1

(config-loop 1)#

ip unnumbered ppp 1

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