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Configuring OSPF route redistribution
On a router running OSPF and other routing protocols, you can configure OSPF to redistribute static
routes, direct routes, or routes from other protocols, such as RIP, IS-IS, and BGP. OSPF advertises
the routes in Type-5 LSAs or Type-7 LSAs. In addition, you can configure OSPF to filter redistributed
routes so that OSPF advertises only permitted routes.
IMPORTANT:
The
import-route bgp
command redistributes only EBGP routes. Because the
import-route bgp
allow-ibgp
command redistributes both EBGP and IBGP routes, and might cause routing loops, use
it with caution.
Redistributing routes from another routing protocol
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter OSPF view.
ospf
[
process-id
|
router-id
router-id
|
vpn-instance
vpn-instance-name
] *
N/A
3.
Configure OSPF to
redistribute routes from
another routing protocol.
import-route
protocol
[
as-number
]
[
process-id
|
all-processes
|
allow-ibgp
] [
allow-direct
|
cost
cost-value
|
nssa-only
|
route-policy
route-policy-name
|
tag tag
|
type
type
]
*
By default, no route
redistribution is configured.
This command redistributes only
active routes. To view
information about active routes,
use the
display ip routing-table
protocol
command.
4.
(Optional.) Configure
OSPF to filter
redistributed routes.
filter-policy
{
ipv4-acl-number
|
prefix-list
prefix-list-name
}
export
[
protocol
[
process-id
] ]
By default, OSPF accepts all
redistributed routes.
Redistributing a default route
The
import-route
command cannot redistribute a default external route. Perform this task to
redistribute a default route.
To redistribute a default route:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter OSPF view.
ospf
[
process-id
|
router-id
router-id
|
vpn-instance
vpn-instance-name
] *
N/A
3.
Redistribute a default
route.
default-route-advertise
[ [
always
|
permit-calculate-other
] |
cost
cost-value
|
route-policy
route-policy-name
|
type
type
] *
default-route-advertise
[
summary
cost
cost-value
]
By default, no default route is
redistributed.
This command is applicable
only to VPNs. The PE router
advertises a default route in a
Type-3 LSA to a CE router.
Configuring default parameters for redistributed routes
Perform this task to configure default parameters for redistributed routes, including cost, tag, and
type. Tags identify information about protocols. For example, when redistributing BGP routes, OSPF
uses tags to identify AS IDs.
To configure the default parameters for redistributed routes:
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