4.3 DDR Configuration  
  4.3.3 Defining static routes for DDR  
To forward traffic, routers need to know what route to use for a given destination. When a dynamic routing protocol is used, the DDR interface will dial the remote site for every routing update or hello message if these packets are defined as interesting traffic. To prevent the frequent or constant activation of the DDR link necessary to support dynamic routing protocols, configure the necessary routes statically.

To configure a static route for IP use the following command:

Router(config)#ip route net-prefix mask {address | interface} [distance] [permanent]

The Central router has a static route to network 10.40.0.0 on the Home router. The Home router has two static routes defined for the two subnets on the Central LAN. If the network attached to the Home router is a stub network, then all non-local traffic should be sent to Central. A default route is a better choice for the Home router in this instance.

Home(config)#ip route 0.0.0.0 0.0.0.0 10.1.0.2

When configuring static routes, consider the following:

  • By default, a static route will take precedence over a dynamic route because of its lower administrative distance. Without additional configuration, a dynamic route to a network will be ignored if a static route is present in the routing table for the same network.
  • To reduce the number of static route entries, define a summarized or default static route.
     

 

Web Links

Evaluating Backup Interfaces, Floating Static Routes, and Dialer Watch for DDR Backup

http://www.cisco.com/en/US/tech/ tk801/tk133/technologies_tech_ note09186a008009457d.shtml