Configuring Ip Unnumbered; Configuration Prerequisites; Configuration Procedure; Ip Unnumbered Configuration Example - 3Com MSR 50 Series Configuration Manual

628 C 40: IP A
HAPTER DDRESSING
Configuring IP
Unnumbered
Configuration
Prerequisites

Configuration Procedure

IP Unnumbered
Configuration Example
C
ONFIGURATION
Assign a primary IP address to the interface from which you want to borrow the IP
address. Alternatively, you may configure the interface to obtain one through
BOOTP, DHCP, or PPP negotiation.
Follow these steps to configure IP unnumbered on an interface:
To do...
Enter system view
Enter interface view
Specify the current interface
to borrow the IP address of
the specified interface
c
CAUTION:
Serial, dial, POS, and ATM interfaces can borrow IP addresses from Layer 3
■
Ethernet interfaces or other interfaces.
Layer 3 Ethernet interfaces, tunnel interfaces and loopback interfaces cannot
■
borrow IP addresses of other interfaces, but other interfaces borrow IP
addresses of these interfaces.
One interface cannot borrow an IP address from an unnumbered interface.
■
Multiple interfaces can use the same unnumbered IP address.
■
The IP address of the borrowing interface always keeps consistent and varies
■
with that of the borrowed interface. That is, if an IP address is configured for
the borrowed interface, the IP address of the borrowing interface is the same
as that of the borrowed interface; if no IP address is configured for the
borrowed interface, no IP address is assigned for the borrowing interface.
Network requirements
Two routers on an intranet are connected to each other through serial interfaces
across DDN, and they each connect to a LAN through Ethernet interfaces.
To save IP addresses, configure the serial interfaces to borrow IP addresses from
the Ethernet interfaces.
Use the command...
system-view
interface interface-type
interface-number
ip address unnumbered
interface interface-type
interface-number
Remarks
--
--
Required
The interface does not borrow
IP addresses from other
interfaces by default.