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Configuring gated
Importing and Exporting Routes
Chapter 3 97
Importing and Exporting Routes
You can propagate routes from one routing protocol to another using the
import and export control statements. Routes are imported into a
gated forwarding table and exported out to the routing protocols.
For more information on import and export statements, type man 4
gated.conf at the HP-UX prompt.
The import Statement
import statements restrict or control routes that are imported to the
gated forwarding table. When routes are imported to the gated
forwarding table, you can export them to the routing protocols. You can
use import statements to perform the following tasks:
• Prevent routes from being imported into the gated forwarding table
by using a restrict clause.
• Assign a preference value to use when comparing a route with other
routes from other protocols. The route with the lowest preference is
installed in the gated forwarding table. The individual protocols
configure the default preferences.
The format of the import statement varies depending on the protocol
from which you are importing routes.
With OSPF, you can apply import statements only to OSPF ASE routes.
All OSPF intra-area and inter-area routes are imported into the gated
forwarding table with an assigned preference of 10.
The export Statement
export statements determine the routes that are exported from the
gated forwarding table to the routing protocols. You can also restrict the
routes that are exported and assign metrics (values used for route
selection) to them. These metrics are applied only after the routes are
exported.
The format of the export statement varies depending on the original
protocol used to build the routes that you are exporting, and the protocol
to which you are exporting routes.