Dialer Watch Connect Delay
Feature History
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12.2(8)T
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This feature was introduced.
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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
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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 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:
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Router(config)#
dialer watch-list
group-number
delay connect
connect-time
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Configures a delay in dialing the secondary link when the primary link becomes unavailable.
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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.
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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:
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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.
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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:
*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 *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 new command is pertinent to this feature. To see the command pages for this command and other commands used with this feature, go to the
Cisco IOS Master Commands List
, Release 12.4, at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/124index.htm
.
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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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