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Configuration Guide - IP Service

S7700 and S9700 V200R013C00

This document describes the configurations of IP service, including IP address, ARP, DHCP, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel and IPv4 over IPv6 tunnel.
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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.

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 interface that borrows an IP address cannot be an Ethernet interface.

  • The IP address of the loopback interface can be lent to other interfaces, but the loopback interface cannot borrow an IP address from another interface.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

    The interface can be a VLANIF interface, tunnel interface, VT interface, or MTunnel interface.

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

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


    The ip address unnumbered command only configures an interface to borrow the IP address from another interface. Other attributes of the interface that borrows an IP address, such as the enablement of routing protocols, need to be configured separately.

Updated: 2019-04-20

Document ID: EDOC1100065743

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