Command sequence explanation
Procedure
1. Assign an IP address to the Loopback interface for use with modem dial backup
using the interface loopback command.
This step allows the Dialer interface to be configured as an IP unnumbered link and
still participate in OSPF routing.
2. Create an access control list with the ip access-control-list command.
The access control list determines which traffic is permitted to use the interface. In
this example, access control list 305 is configured to block all traffic other than VoIP
signalling traffic. The primary purpose of the access control list is to block bearer
traffic from using the Dialer interface. The Dialer interface generally has insufficient
bandwidth to support bearer traffic. For more information on configuring access
control lists, see Policy lists on page 557.
3. Create the Dialer interface using the interface dialer command.
The Dialer interface is created and is available as a backup link for a WAN interface.
Only one Dialer interface can be created on the Branch Gateway.
4. Assign a PPP authentication method with the ppp chap hostname command.
The Dialer interface authenticates its PPP sessions to the remote RAS server using
CHAP authentication and a username of area5. The username area5 must be
configured on the RAS as a legitimate user.
5. Assign an initial delay for dialing with the dialer persistent initial
delay command.
The initial delay prevents the Dialer from dialing out unnecessarily on reboot. The
primary WAN interface often requires a few moments to register itself as up, and
during that period, the initial delay prevents the device from activating the Dialer.
6. Assign a reset delay for the dialer string list using the dialer persistent
delay command.
The reset delay determines the amount of time between cycles of call attempts,
once all dialer strings have been attempted.
7. Enter up to five dialer strings using the dialer string command.
When the Dialer interface is activated, the Dialer first attempts to connect to the
number associated with dialer string 1. If the connection attempt fails, the Dialer
attempts to connect to the number associated with the next dialer string. These
strings represent hunt group phone numbers configured on the RAS server in the
headquarters data center.
8. Associate the Dialer interface with its physical port with the dialer modem-
interface command.
The Dialer interface must be configured to use a physical interface on the device to
which the modem is connected. Modem dial backup is supported on the USB
port.
WAN interfaces
Administering Avaya G430 Branch Gateway October 2013 269
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