Setting Up an Unnumbered Interface

An unnumbered interface does not have an IP address assigned to it. Unnumbered interfaces are often used in point-to-point connections where an IP address is not required.

ip unnumbered

• Use to set up an unnumbered interface.
• This command enables IP processing on an interface without assigning an explicit IP address to the interface.
• You supply an interface location, which is the type and number of another interface on which the router has an assigned IP address. This interface cannot be another unnumbered interface.
• Example

  host1(config-if)#ip unnumbered fastEthernet 0/0

• Use the no version to disable IP processing on an interface.
• See ip unnumbered

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