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Dial Backup Using Dialer Watch Commands

Dial Backup Using Dialer Watch Commands

This chapter describes the commands used to configure dial backup using the Dialer Watch feature introduced in Cisco IOS Release 11.3 T.

Dialer Watch is a backup feature that integrates dial backup with routing capabilities. Dialer Watch provides reliable connectivity without relying solely on defining interesting traffic to trigger outgoing calls at the central router. Dialer Watch uses the convergence times and characteristics of dynamic routing protocols. Integrating backup and routing features enables Dialer Watch to monitor every deleted route. By configuring a set of watched routes that define the primary interface, you are able to monitor and track the status of the primary interface as watched routes are added and deleted.

For configuration tasks and corresponding examples, refer to the "Configuring Dial Backup using Dialer Watch" chapter in the Dial Solutions Configuration Guide.

dialer watch-disable

To set a delay time to the backup interface, use the dialer watch-disable interface configuration command. At times, you may want to delay disconnecting the backup interface after the primary interface recovers. To disable this feature, use the no form of this command.

dialer watch-disable seconds
no dialer watch-disable

Syntax Description

seconds

The timeout value in seconds.

Default

Disabled

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 T.

This command is optional.

This command is used to add a delay time to the backup interface. The delay time delays the time it takes for the backup interface to disconnect after the primary interface recovers.

Example

The following example forces a 6-second delay to the backup interface once the primary interface recovers:

interface bri0
  ip address 2.1.1.2 255.255.255.0
  encapsulation ppp
  dialer map ip 3.1.1.1 255.255.255.0 name hubble 5551234
  dialer-group 1
  dialer watch-group 1
  dialer watch-disable 6

Related Commands

show dialer interface

dialer watch-group

To enable DDR backup on an interface using Dialer Watch, configure the interface using the dialer watch-group interface configuration command. To disable this feature, use the no form of this command.

dialer watch-group group-number
no dialer watch-group
group-number

Syntax Description

group-number

Group number assigned that will point to a globally defined list of IP addresses to watch. The valid range is 1 to 255.

Default

Disabled

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 T.

Use the dialer watch-group command on the secondary interface you want to enable DDR backup.

The dialer watch group number points to a globally defined list (the dialer watch-list command) that contains the IP addresses to be watched. If you use the dialer watch-group command you must also use the dialer watch-list command.

You must configure the standard commands required to enable the router to perform DDR in addition to the Dialer Watch commands. Refer to Cisco IOS Release 12.0 configuration guides and command references for additional information.

The dialer watch-group and dialer watch-list commands can be added in any order.

Example

The following example configures BRI interface 0 as the backup interface:

interface bri0
  ip address 2.1.1.2 255.255.255.0
  encapsulation ppp
  dialer watch-group 1

dialer watch-list

To add the list of IP addresses you want monitored, use the dialer watch-list global configuration command. To disable this feature, use the no form of this command.

dialer watch-list group-number ip ip-address address-mask
no dialer watch-list group-number ip ip-address address-mask

Syntax Description

group-number

Group number assigned to the list. Valid group numbers are between 1 and 255.

ip

IP is the only routed protocol supported for Dialer Watch at this time.

ip-address

IP address or address range to be applied to the list.

address-mask

IP address mask to be applied to the list.

Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 T.

Use this command to add all IP addresses or networks you want monitored.

There is no software limit to the number of protocol addresses that can be added to the group.

Address matching is exact; therefore, you must apply the specific IP address and mask range for the networks you want monitored.

Use this command with the dialer watch-group interface configuration command. The number of the group list must match the group number. For example, if you use dialer watch-group number  1, you must also use dialer watch-list number 1.

You must configure the standard commands required to enable the router to perform DDR in addition to the Dialer Watch commands. Refer to Cisco IOS Release 12.0 configuration guides and command references for additional information.

The dialer watch-list and dialer watch-group commands can be added in any order.

Example

The following example adds the IP addresses to be watched:

dialer watch-list 1 ip 3.1.1.0 255.255.255.0
dialer watch-list 1 ip 2.1.1.0 255.255.255.0
dialer watch-list 1 ip 5.1.1.0 255.255.255.0


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