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The primary and secondary IP addresses can be located in the same network segment.

Before removing the primary IP address, remove all secondary IP addresses.

You can assign a secondary IP address only when the interface is not configured to borrow an IP address through IP unnumbered or obtain one through BOOTP, DHCP, or PPP negotiation.

Related command: display ip interface.

Example Assign Ethernet1/0 a primary IP address and a secondary IP address, with the subnet masks both being 255.255.255.0.

<Sysname> system-view

[Sysname] interface ethernet 1/0 [Sysname-Ethernet1/0] ip address 129.102.0.1 255.255.255.0

[Sysname-Ethernet1/0] ip address 202.38.160.1 255.255.255.0 sub

ip address unnumbered

Syntax ip address unnumbered interface interface-typeinterface-number

undo ip address unnumbered

View Interface view

Parameter interface interface-typeinterface-number: Specifies an interface from which the current interface can borrow an IP address.

Description Use the ip address unnumbered command to configure the current interface as IP unnumbered to borrow an IP address from another interface.

Use the undo ip address unnumbered command to disable IP unnumbered on the interface.

By default, the interface does not borrow IP addresses from other interfaces.

Example # Configure PPP-encapsulated interface Serial 2/2 to borrow IP address from interface Ethernet 1/0.

<Sysname> system-view

[Sysname] interface serial 2/2

[Sysname-Serial2/2] ip address unnumbered interface ethernet 1/0

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