The backup route is installed dynamically and used in
place of the removed route.
The Security Appliance can be configured to use one of the following objects as the monitoring target:
ISP gateway address
Next-hop gateway address
Specific server on the target network, such as a AAA server or the web server
Any persistent network object on the destination network
Note
For additional details on static route tracking, refer to the following Cisco documentation URL:
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/ip.html#wp1090243.
Default Route
To avoid the need to use static route entries for every possible destination network, a default route identifies
the default gateway address for forwarding packets for destination network(s) not explicitly found in the routing
table. Default routes are put to best use in topologies where learning all or more specific networks is not
desirable, as in the case of stub networks, or networks with only a single link connecting to the external network
(or Internet). A default route is simply a static route (with a destination address/mask pair of 0.0.0.0/0) that is
configured using the same route command used to define static routes and is usually aimed toward the
external network on the outside interface.
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