Configuring Unnumbered Ip Interfaces; Configuring Unnumbered Ip On An Interface - Avaya G250 Administration

Configuring the router
Use the following commands to create VLAN 2 on the Switching Interface and configure it with
IP address 10.30.50.70 and subnet mask 255.255.0.0:
G350-001# interface Vlan 2
G350-001(if:Vlan 2)# ip address 10.30.50.70 255.255.0.0
Done!

Configuring unnumbered IP interfaces

Unnumbered IP is a feature that enables you to configure a point-to-point interface to borrow an
IP address from another interface. Unnumbered IP enables IP processing on a point-to-point
interface without assigning an explicit IP address to the interface.
Although unnumbered IP is supported on all point-to-point interfaces, the main use of the
feature is to enable dynamic routing on the Dialer interface. The Dialer interface is used for the
modem dial-backup feature. Refer to
feature that sets up a backup dialing destination for a branch gateway. Modem dial-backup
requires unnumbered IP to be configured on the Dialer interface of the branch gateway and at
both the default and the backup dialing destinations.

Configuring unnumbered IP on an interface

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.
1. Decide which interface from which to borrow the IP address. If necessary, configure the
interface. You can use the show interfaces command to display existing interface
configuration.
2. Enter the context of the interface on which you want to configure an unnumbered IP
address (usually the Dialer interface).
3. Use the ip unnumbered command, specifying the interface from which to borrow the IP
address.
406 Administration for the Avaya G250 and Avaya G350 Media Gateways
Modem dial backup on page 233. Modem dial-backup is a