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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:
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
] *
—
Redistribute a default route
default-route-advertise
[ [ [
always
|
permit-calculate-other
] |
cost
cost
|
route-policy
route-policy-name
|
type
type
] * |
summary cost
cost
]
Required
Not redistributed by
default.
NOTE:
The
default-route-advertise
summary cost
command is applicable only to VPN, and the default route is
redistributed in a Type-3 LSA. The PE router advertises the default route to the CE router.
