102
Syntax
import-route
protocol
[
process-id
|
all-processes
|
allow-ibgp
] [
cost
cost
| [
cost
cost
|
route-policy
route-policy-name
|
tag
tag
|
type
type
] *
undo import-route
protocol
[
process-id
|
all-processes
]
Default
OSPF does not redistribute AS-external routes from any other routing protocol.
Views
OSPF view
Predefined user roles
network-admin
Parameters
protocol
: Redistributes routes from the specified protocol, which can be
bgp
,
direct
,
isis
,
ospf
,
rip
, or
static
.
process-id
: Specifies an process by its ID in the range of 1 to 65535. The default is 1. It is available only
when the
protocol
is
rip
,
ospf
, or
isis
.
all-processes
: Redistributes routes from all the processes of the specified routing protocol. This keyword
takes effect only when the protocol is
rip
,
ospf
, or
isis
.
allow-ibgp
: Allows redistribution of IBGP routes. It is available only when the
protocol
is
bgp
.
cost
cost
: Specifies a route cost in the range of 0 to 16777214. The default is 1.
route-policy
route-policy-name
: Uses the specified routing policy to filter redistributed routes. The
route-policy-name
argument is a case-sensitive string of 1 to 63 characters.
tag
tag
: Specifies a tag for marking external LSAs, in the range of 0 to 4294967295. The default is 1.
type
type
: Specifies a cost type, 1 or 2. The default is 2.
Usage guidelines
This command redistributes routes destined for other ASs from another protocol. AS external routes
include the following types:
•
Type-1 external route
•
Type-2 external route
A Type-1 external route has high reliability. Its cost is comparable with the cost of OSPF internal routes.
The cost from an OSPF router to a Type-1 external route's destination equals the cost from the router to the
ASBR plus the cost from the ASBR to the external route's destination.
A Type-2 external route has low credibility. OSPF considers the cost from the ASBR to the destination of
a Type-2 external route is much bigger than the cost from the ASBR to an OSPF internal router. The cost
from an internal router to a Type-2 external route's destination equals the cost from the ASBR to the Type-2
external route's destination.
The
import-route
command cannot redistribute default external routes.
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.