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Configuring Routing 515
Static Reject Routes
A static reject route is a static route to discard the packets to a particular destination, thereby forcing a
black-hole routing behavior for a particular set of IP prefixes. Static reject routes can help prevent a
routing loop in the network if a default route is configured on a router. Static reject routes also help
protect against a DOS attack on a router with unwanted destination addresses.
NOTE: Static reject routes are not redistributed by OSPF or RIP.
Starting with software release 3.0, you can select Static Reject as a route type from the Route Type field
on the following pages under the Routing > Router menu:
• Route Entry Configuration
• Configured Routes
NOTE: For a static reject route, the next hop interface value is Null0. Packets to the network address specified in
static reject routes are intentionally dropped.
To display the page, click Routing > RIP > Route Redistribution Configuration in the tree view.
Figure 9-31. RIP Route Redistribution Configuration
The RIP Route Redistribution Configuration page contains the following fields:
•
Source
— Select the type of source route to configure for redistribution by RIP. Possible values are:
–
Static
–
Connected
–
OSPF
•
Metric
— Sets the metric value to be used as the metric of redistributed routes. This field displays the
metric if the source was pre-configured and can be modified. The valid values are 1 to 15.
•
Distribute List
— Select the Access List that filters the routes to be redistributed by the destination
protocol. Only permitted routes are redistributed.