H3C Technologies H3C S10500 Series Switches - Manual (Page 101)

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Configuring OSPF preference
A router can run multiple routing protocols, and each protocol is assigned a preference. When the
routing protocols find routes to the same destination, the route found by the protocol with the highest
preference is selected as the best route.
Follow these steps to configure OSPF preference:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ] *
—
Configure a preference for
OSPF preference [ ase ] [ route-policy
route-policy-name ] value
Optional
By default, the preference of OSPF
internal routes is 10, and the preference
of OSPF external routes is 150.
Configuring OSPF route redistribution
Configure route redistribution into OSPF
On a router running OSPF and other routing protocols, you can configure OSPF to redistribute routes
from other protocols such as RIP, IS-IS, BGP, static, and direct routes, and advertise them in Type-5 LSAs
or Type-7 LSAs.
By filtering redistributed routes, OSPF translates only permitted routes into Type-5 LSAs or Type-7 LSAs for
advertisement.
Follow these steps to configure OSPF route redistribution:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
—
Configure OSPF to redistribute
routes from another protocol
import-route protocol [ process-id |
all-processes | allow-ibgp ] [ cost cost | type
type | tag tag | route-policy
route-policy-name ] *
Required
Not configured by default.
Configure OSPF to filter
redistributed routes before
advertisement
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ protocol
[ process-id ] ]
Optional
Not configured by default.
NOTE:
Only active routes can be redistributed. Use the display ip routing-table protocol command to view route
state information.
Configure OSPF to redistribute a default route
Using the import-route command cannot redistribute a default external route. To do so, you must use the
default-route-advertise command.
Follow these steps to configure OSPF to redistribute a default external route: