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Table Of Contents
Supported Standards, MIBs, and RFCs
Configuring a Delay Before Activating a Secondary Link
Configuring a Delay Before Disconnecting the Secondary Link
Verifying Dialer Watch Connect Delay Configuration
Configuring a Delay Before Activating a Secondary Link Example
Configuring a Delay Before Disconnecting a Secondary Link Example
Dialer Watch Connect Delay
Feature History
This document describes the Dialer Watch Connect Delay feature in Cisco IOS Release 12.2(8)T and includes the following sections:
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Supported Standards, MIBs, and RFCs
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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
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Supported Platforms
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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.
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:
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:
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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.
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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:
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:
Verifying Dialer Watch Connect Delay Configuration
To verify the cofiguration fo the Dialer Watch Connect Delay feature, perform the following steps:
Step 1
router# show running-configdialer watch-list 1 ip 10.1.1.1 255.0.0.0dialer watch-list 1 delay connect 20dialer watch-list 1 delay disconnect 20dialer-list 1 protocol ip permitStep 2
router# debug dialerConnect 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 timerDisconnect 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:
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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 10.1.1.0 255.255.255.0dialer watch-list 1 delay connect 10Configuring 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 10.1.1.0 255.255.255.0dialer watch-list 1 delay disconnect 10Command Reference
This section documents the new dialer watch-list delay command. All other commands used with this feature are documented in the Cisco IOS Release 12.2 command reference publications.
dialer watch-list delay
To configure the router to delay before connecting or disconnecting a secondary link for a route monitored by Dialer Watch, use the dialer watch-list delay command in global configuration mode. To disable these delays, use the no form of this command.
dialer watch-list group-number delay {connect connect-time | disconnect disconnect-time}
no dialer watch-list group-number delay {connect connect-time | disconnect disconnect-time}
Syntax Description
Defaults
No delay is configured.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to configure a delay before connecting or disconnecting a secondary link for a route monitored by Dialer Watch. This command will not work unless dial-on-demand routing (DDR) is configured and Dialer Watch has been enabled.
Examples
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 10.1.1.0 255.255.255.0dialer watch-list 1 delay connect 10The 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 10.1.1.0 255.255.255.0dialer watch-list 1 delay disconnect 10Related Commands
dialer watch-group
Enables DDR backup on an interface using Dialer Watch.
dialer watch-list
Adds the list of IP addresses to be monitored for Dialer Watch.