Protocol Independent Features
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
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ONFIGURE IP UNNUMBERED INTERFACE
Note: This is valid only for Serial point-to-point interfaces only.
Typically to make an interface 'IP enabled', an IP address is configured on it.
However, configuring IP addresses for point-to-point interfaces leads to wasting
internet IP addresses/IP subnets. To solve this problem, the concept of
unnumbered interfaces is used.
The IP unnumbered configuration command enables IP processing on an
interface without assigning it an explicit IP address. The IP unnumbered interface
can "borrow" the IP address of another interface already configured on the router
that is up and running.
It is recommended that the unnumbered interface point to a loopback interface
since loopback interface does not fail.
• The interface specified must be the name of another interface in the system that
has an IP address, not another unnumbered interface.
• If the associated/numbered interface is configured as an unnumbered interface,
then the existing IP address shall be deleted and the interface shall be made as
an unnumbered interface. In this case, the unnumbered interface also loses the IP
address.
• If the IP address on the associated numbered interface is deleted, then the
unnumbered interface also loses the IP address.
• If the associated numbered interface is deleted, then the unnumbered interface
loses the IP address.
• Unnumbered IP on Serial interfaces shall support PPP, HDLC, FR, MLPPP,
MLFR, encapsulations.
Note: OmniAccess 5740 USG supports static routing over unnumbered interfaces. Dynamic
routing protocols on unnumbered interface (RIP, OSPF, and BGP) are not supported.
Command (in ICM) Description
ip unnumbered <interface-name>
<slot/port>
This command is used in the Interface
Configuration mode.
This command is used to configure an
interface to be an unnumbered
interface and associate a numbered IP
interface with it.
Use of this command results in the IP
address being shared by two interfaces.
no ip unnumbered <interface-
name> <slot/port>
This command is used to unconfigure
the unnumbered interface.
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