25-3
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter25 Configuring Static and Default Routes
Configuring Static and Default Routes
Configuring a Static Route
Static routing algorithms are basically table mappings established by the network administrator before
the beginning of routing. These mappings do not change unless the network administrator alters them.
Algorithms that use static routes are simple to design and work well in environments where network
traffic is relatively predictable and where network design is relatively simple. Because of this fact, static
routing systems cannot react to network changes.
Static routes remain in the routing table even if the specified gateway becomes unavailable. If the
specified gateway becomes unavailable, you need to remove the static route from the routing table
manually. However, static routes are removed from the routing table if the specified interface goes down,
and are reinstated when the interface comes back up.
Note If you create a static route with an administrative distance greater than the administrative distance of the
routing protocol running on the ASA, then a route to the specified destination discovered by the routing
protocol takes precedence over the static route. The static route is used only if the dynamically
discovered route is removed from the routing table.
You can define up to three equal cost routes to the same destination per interface. Equal-cost multi-path
(ECMP) routing is not supported across multiple interfaces. With ECMP, the traffic is not necessarily
divided evenly between the routes; traffic is distributed among the specified gateways based on an
algorithm that hashes the source and destination IP addresses.
To configure a static route, choose one of the following:
•Adding or Editing a Static Route, page25-3
•Configuring Static Route Tracking, page25-5
•Deleting Static Routes, page 25-6

Adding or Editing a Static Route

To add or edit a static route in ASDM, perform the following steps:
Step1 In the main ASDM window, choose Configuration > Device Setup > Routing > Static Routes.
Step2 Choose which route to filter by clicking one of the following radio buttons:
•Both (filters both IPv4 and IPv6)
•IPv4 only
•IPv6 only
By default, the Both radio button is selected, and both IPv4 and IPv6 addresses appear in the pane. To
limit your viewed choices to routes configured with IPv4 addresses, click the IPv4 radio button. To limit
your viewed choices to routes configured with IPv6 addresses, click the IPv6 radio button.
Step3 Click Add or Edit.
The Add or Edit Static Route dialog box appears.
Step4 From the Interface drop-down list, choose the internal or external network interface name enabled in the
Interface field:
•management (internal interface)
•outside (external interface)