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Configuring Routing 529
Adding a Router Route
1.
Open the
Configured Routes
page.
2.
Click
Add
.
The
Router Route Entry Configuration
page displays, as Figure 9-38 shows.
3.
Next to
Route Type,
use the drop-down box to add a
Default
route or a
Static
route.
Default
— Enter the default gateway address in the
Next Hop IP Address
field. Figure 9-38 shows the
fields that display when the
Route Type
value is Default.
Static
— Enter values for
Network Address
,
Subnet Mask
,
Next Hop IP Address
, and
Preference
.
Figure 9-39 shows the fields that display when the
Route Type
value is Static.
4.
Click
Apply Changes
.
The new route is added, and you are returned to the Configured Routes page.
Displaying Configured Routes using the CLI Command
For information about the CLI command that performs this function, see the following chapter in the
CLI Reference Guide:
• IP Routing Commands
Route Preferences Configuration
Use the Router Route Preferences Configuration
page to configure the default preference for each
protocol (for example 60 for static routes). These values are arbitrary values that range from 1 to 255, and
are independent of route metrics. Most routing protocols use a route metric to determine the shortest
path known to the protocol, independent of any other protocol.
The best route to a destination is chosen by selecting the route with the lowest preference value. When
there are multiple routes to a destination, the preference values are used to determine the preferred
route. If there is still a tie, the route with the best route metric is chosen. To avoid problems with
mismatched metrics (i.e. RIP and OSPF metrics are not directly comparable), you must configure
different preference values for each of the protocols.
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.