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For more information about interesting and uninteresting packets, see "Associating a dial rule with a
dialup interface."
Auto-dial DDR
DDR automatically initiates a dialup connection to the remote end upon router startup without requiring
a triggering packet. If the connection cannot be established, it will retry at certain intervals. The
established connection will not disconnect due to timeout of the idle-timeout timer.
Route-triggered DDR
You can configure networks to be monitored and then associate a dialup interface with the networks.
When no routes to the monitored networks exist, DDR creates a backup connection from the dialup
interface to forward traffic. After the backup link is activated, the system regularly checks the status of the
primary link. When the primary link recovers, the backup link is disconnected immediately or when the
timer expires, depending on your configuration.
Command and hardware compatibility
Commands and descriptions for centralized devices apply to the following routers:
• MSR1002-4/1003-8S.
• MSR2003.
• MSR2004-24/2004-48.
• MSR3012/3024/3044/3064.
Commands and descriptions for distributed devices apply to MSR4060 and MSR4080 routers.
DDR configuration task list
Packet-triggered DDR configuration task list
Tasks at a
lance
(Required.) Configuring basic settings for DDR
• Configuring physical interfaces
• Configuring link layer/network/routing protocols on the dialup interface
(Required.) Associating a dial rule with a dialup interface
(Required.) Perform one of the following tasks:
• Configuring traditional DDR
{ Configuring an interface to place calls
{ Configuring an interface to receive calls
• Configuring bundle DDR
{ Configuring a dialer interface to place calls
{ Configuring a dialer interface to receive calls
(Required.) Configuring attributes for a dialup interface
(Optional.) Configuring MP for DDR
(Optional.) Configuring PPP callback
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