Avaya G430 Manual page 427

Unnumbered IP on an interface configuration
To configure unnumbered IP on an interface, you must specify the interface from which to
borrow the IP address. The borrowed interface must already exist and have an IP address
configured on it.
The status of an unnumbered IP interface is down whenever the borrowed interface is down.
Therefore, it is recommended to borrow the IP address from an interface that is always up,
such as the Loopback interface.
Routes discovered on an unnumbered interface by the RIP and OSPF routing protocols are
displayed as via routes in the routing table. The next hop is listed as via the IP unnumbered
interface instead of the source address of the routing update.
Configuring IP on an interface configuration
Procedure
1. Decide which interface from which to borrow the IP address.
2. Enter the context of the interface on which you want to configure an unnumbered
3. Use the ip unnumbered command, specifying the interface from which to borrow
Unnumbered IP examples
In the following example, a VLAN interface is configured, and then the Dialer interface is
configured with an unnumbered IP address, borrowing the IP address from the VLAN
interface.
//enter the context of vlan interface 1:
Gxxx-001(super)# interface Vlan 1
//to configure the IP address of the vlan interface:
Gxxx-001(super-if:Vlan 1)# ip address 180.0.0.1 255.255.255.0
Gxxx-001(super-if:Vlan 1)# exit
Gxxx-001# !
//enter the context of the Dialer interface:
Gxxx-001(super)# interface dialer 1
Gxxx-001(super-if:Dialer 1)# dialer string 1 3001
Gxxx-001(super-if:Dialer 1)# dialer persistent delay 1
Gxxx-001(super-if:Dialer 1)# dialer modem-interface USB-modem
//to configure IP unnumbered on the Dialer interface, borrowing the IP address from
Administering Avaya G430 Branch Gateway
If necessary, configure the interface. You can use the show interfaces
command to display existing interface configuration.
IP address (usually the Dialer interface).
the IP address.
The router
October 2013 427