Explanation/Reference:
Explanation:
A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:
Command Purpose
Step 1 Router(config)# interface dialer Creates a dialer interface and number enters interface configuration mode.
Step 2 Router(config-if)# ip address Specifies the IP address and mask address mask of the dialer interface as a node in the destination network to be
called.
Step 3 Router(config-if)# encapsulation Specifies the encapsulation type.
type
Step 4 Router(config-if)# dialer string Specifies the remote destination to dial-string class class-name call and the map class that defines characteristics for calls to this destination.
Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination.
Step 6 Router(config-if)# dialer-group Assigns the dialer interface to a group-number dialer group.
Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol- number or by protocol and list name {permit | deny | list number to define the interesting access-list-number} packets that can trigger a call. Step 8 Router(config-if)# dialer (Optional) Specifies the remote-name user-name authentication name of the remote router on the destination subnetwork for a dialer interface.
Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] connected at all times, even in seconds | max-attempts the absence of interesting traffic.
number]
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia_dia ler_persist.html