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R0106-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V7)

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• Layer 3 Ethernet interfaces and loopback interfaces cannot borrow IP addresses of other interfaces,
but other interfaces can borrow IP addresses of these interfaces.
• An interface cannot borrow an IP address from an unnumbered interface.
• Multiple interfaces can use the same unnumbered IP address.
• If an interface has multiple manually configured IP addresses, only the manually configured primary
IP address can be borrowed.
Configuration prerequisites
Assign an IP address to the interface from which you want to borrow the IP address. Alternatively, you
can configure the interface to obtain one through BOOTP, DHCP, or PPP address negotiation.
Configuration procedure
To configure IP unnumbered on an interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Specify the interface to borrow the
IP address of the specified
interface.
ip address unnumbered
interface interface-type
interface-number
By default, the interface does not
borrow IP addresses from other
interfaces.
A dynamic routing protocol cannot be enabled on the interface where IP unnumbered is configured. To
enable the interface to communicate with other devices, configure a static route to the peer device on the
interface. For more configuration information, see "IP unnumbered configuration example."
Displaying and maintaining IP addressing
Execute display commands in any view.
Task Command
Display IP configuration and statistics for the specified
or all Layer 3 interfaces.
display ip interface [ interface-type interface-number ]
Display brief IP configuration information for the
specified or all Layer 3 interfaces.
display ip interface [ interface-type
[ interface-number ] ] brief [ description ]
Configuration examples
IP address configuration example
Network requirements
As shown in Figure 7, GigabitEthernet 2/1/1 on the router is connected to a LAN comprising two
s eg men ts : 172.16.1.0 /24 a n d 172.16. 2.0 / 24 .