Dialer Watch Connect Delay

Feature History

Release
Modification

12.2(8)T

This feature was introduced.

This document describes the Dialer Watch Connect Delay feature in Cisco IOS Release 12.2(8)T and includes the following sections:

Feature Overview

The Dialer Watch Connect Delay feature introduces the ability to configure a delay in bringing up a secondary link when a primary link that is monitored by Dialer Watch goes down and is removed from the routing table. Previously, the router would instantly dial a secondary route without allowing time for the primary route to come back up. When the Dialer Watch Connect Delay feature is configured, the router will check for availability of the primary link at the end of the specified delay time before dialing the secondary link.

Benefits

The Dialer Watch Connect Delay feature allows users greater control over the use of a secondary link on monitored IP addresses or networks. Configuring the router to delay bringing up a secondary link when the watched primary link goes down will allow time for the primary link to be restored in the event of a temporary outage.

Related Documents

  • The part “ Dial-on-Demand Routing Configuration ” in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2.
  • The chapter “ Configuring Dial Backup Using Dialer Watch ” in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2.
  • Cisco IOS Dial Technologies Command Reference, Release 12.2

Supported Platforms

  • Cisco 805
  • Cisco 806
  • Cisco 820
  • Cisco 827
  • Cisco 828
  • Cisco 1600 series
  • Cisco 1700
  • Cisco 1710
  • Cisco 2600 series
  • Cisco 3640
  • Cisco 3660
  • Cisco 7100
  • Cisco 7200
  • Cisco 7500
  • soho 78
  • mc3810
  • C6MSFC2

Determining Platform Support Through Cisco Feature Navigator

Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions at http://www.cisco.com/register.

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/fn

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

No new or modified RFCs are supported by this feature.

Prerequisites

Dial-on-Demand routing (DDR) must be configured and Dialer Watch must be enabled. For more information on configuring DDR, refer to the following documents:

  • The part “ Dial-on-Demand Routing Configuration ” in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2.
  • The chapter “ Configuring Dial Backup Using Dialer Watch ” in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2.

Configuration Tasks

See the following sections for configuration tasks for the Dialer Watch Connect Delay feature. Each task in the list is identified as either required or optional.

Configuring a Delay Before Activating a Secondary Link

To configure the router to delay before dialing a secondary link when the primary link goes down, use the following command in global configuration mode:

 

Command
Purpose

Router(config)# dialer watch-list group-number delay connect connect-time

Configures a delay in dialing the secondary link when the primary link becomes unavailable.

  • The delay connect keyword phrase specifies that the router will delay dialing the secondary link when the primary link becomes unavailable.
  • The connect-time argument specifies the time, in seconds, after which the router rechecks for availability of the primary link. If the primary link is still unavailable, the secondary link is then dialed. Valid times range from 1 to 2147483.

Configuring a Delay Before Disconnecting the Secondary Link

To configure the router to delay before disconnecting a secondary link when the primary link is reestablished, use the following command in global configuration mode:

 

Command
Purpose

Router(config)# dialer watch-list group-number delay disconnect disconnect-time

Configures a delay in disconnecting the secondary link after detecting availability of the primary link.

  • The delay disconnect keyword phrase specifies that the router will delay disconnecting the secondary link after detecting availability of the primary link.
  • The disconnect-time argument specifies the time, in seconds, after which the router disconnects the secondary link once the primary link has been detected. Valid times range from 1 to 2147483.

Verifying Dialer Watch Connect Delay Configuration

To verify the cofiguration fo the Dialer Watch Connect Delay feature, perform the following steps:

Step 1 Enter the show running-config command to verify the configuration of Dialer Watch connect and disconnect delays:

router# show running-config
 
dialer watch-list 1 ip 10.1.1.1 255.0.0.0
dialer watch-list 1 delay connect 20
dialer watch-list 1 delay disconnect 20
dialer-list 1 protocol ip permit
 

Step 2 Enter the debug dialer command:

router# debug dialer
 
Connect Delay
------------------------
 
*Mar 1 04:29:16:DDR:Dialer Watch:watch-group = 1
*Mar 1 04:29:16:DDR: network 5.0.0.0/255.0.0.0 DOWN,
*Mar 1 04:29:16:DDR: network 4.0.0.0/255.0.0.0 DOWN,
*Mar 1 04:29:16:DDR: network 3.0.0.0/255.0.0.0 DOWN,
*Mar 1 04:29:16:DDR: primary DOWN
*Mar 1 04:29:16:DDR:Dialer Watch: Primary of group 1 DOWN - start dial-backup timer
 
 
Disconnect delay
------------------------
 
*Mar 1 04:31:11:BR2/0:1 DDR:idle timeout
*Mar 1 04:31:11:DDR:Dialer Watch:watch-group = 1
*Mar 1 04:31:11:DDR: network 5.0.0.0/255.0.0.0 UP,
*Mar 1 04:31:11:DDR: primary UP
*Mar 1 04:31:11:BR2/0:1 DDR:starting watch disconnect timer
*Mar 1 04:31:46:BR2/0:1 DDR:watch disconnect timeout
*Mar 1 04:31:46:DDR:Dialer Watch:watch-group = 1
*Mar 1 04:31:46:DDR: network 5.0.0.0/255.0.0.0 UP,
*Mar 1 04:31:46:DDR: primary UP
 

 

Configuration Examples

This section provides the following configuration examples:

Configuring a Delay Before Activating a Secondary Link Example

The following example configures the router to wait 10 seconds before verifying that the primary link is still down and dialing a secondary link:

dialer watch-list 1 ip 10.1.1.0 255.255.255.0
dialer watch-list 1 delay connect 10
 

Configuring a Delay Before Disconnecting a Secondary Link Example

The following example configures the router to wait 10 seconds to disconnect a secondary link once the primary link has been reestablished:

dialer watch-list 1 ip 10.1.1.0 255.255.255.0
dialer watch-list 1 delay disconnect 10
 

Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Dial Technologies Command Reference at http://www.cisco.com/en/US/docs/ios/dial/command/reference/dia_book.html . For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List

  • dialer watch-list delay

 

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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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