Cisco Systems CL-28826-01 Static Routing on Cisco IOS Routers

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User Guide for Cisco Security Manager 4.4

OL-28826-01

Chapter 64 Configuring Routing Policies

Static Routing on Cisco IOS Routers

Static Routing on Cisco IOS Routers

You can configure static routing policies to ensure that the router correctly forwards packets to their

destination when a route cannot be built dynamically. By default, static routes have a default

administrative distance of 1 (implying a directly connected network), which causes them to override any

dynamic routes discovered for the same host or network. You can, however, define a larger

administrative distance to a static route so that it does not take precedence over a corresponding dynamic

route.

For example, EIGRP routes have a default administrative distance of 5. To have a static route that can

be overridden by an EIGRP route, you must specify an administrative distance greater than 5. This

feature is useful when you define the static route as a “floating” route, which is inserted into the routing

table only when the preferred route is unavailable.

Tip When you use the static route as a backup, “floating” route, specify the interface through which the next

hop IP address can be reached instead of entering a specific IP address. Otherwise, the “floating” route

is not inserted in the routing table if the primary link fails. For more information, see Specifying a Next

Hop IP Address for Static Routes on Cisco.com at this URL:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800ef7b2.shtml

To define a static route, you must define the IP address (and optionally, the metric) of the hop gateway

to which the router forwards packets destined to the selected host or network. You can define as many

static routes as required.