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
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
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