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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring IP Unnumbered on an Interface

Configuring IP Unnumbered on an Interface


In some scenarios, an interface can borrow an IP address from another interface to conserve IP addresses. For example, if an interface is seldom used, configure IP unnumbered on this interface so that the interface can share an IP address with another interface.

An IP unnumbered interface cannot run dynamic routing protocols because it does not have an IP address itself. To enable the interface to communicate with a peer network segment, configure a static route to the network segment.

The restrictions for IP unnumbered interface configuration are as follows:

  • The IP address to be borrowed cannot be a borrowed IP address.

  • The IP address can be lent to multiple interfaces.

  • If an interface has more than one IP address, IP unnumbered interfaces can borrow only the primary IP address.

  • If the interface assigned to an IP unnumbered interface has no IP address, the IP unnumbered interface obtains the IP address

  • The IP address of the loopback interface can be lent to other interfaces.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ip address unnumbered interface interface-type interface-number

    The interface is configured to borrow the IP address from a specified interface.

    By default, an interface does not borrow the IP address from another interface.

  4. Run commit

    The configuration is committed.

Updated: 2019-04-18

Document ID: EDOC1100039535

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