Configuring the Open Shortest Path First Protocol
20-35
20
Redistributing External Routes
You can configure this router to import external routing information from other
routing protocols or static routes into the autonomous system, and to generate
AS-external-LSAs.
Command Usage
• This router supports redistribution for entries learned through RIP, and static
routes.
• When you redistribute external routes into an OSPF autonomous system (AS), the
router automatically becomes an autonomous system boundary router (ASBR).
• However, if the router has been manually configured as an ASBR via the General
Configuration screen, but redistribution is not enabled, the router will only generate
a “default” external route into the AS if it has been configured to “always” advertise
a default route even if an external route does not actually exist (page 20-15).
Command Attributes
• Redistribute Protocol – Specifies the external routing protocol type for which
routing information is to be redistributed into the local routing domain.
(Options: RIP, Static; Default: RIP)
• Redistribute Metric Type – Indicates the method used to calculate external route
costs. (Options: Type 1, Type 2; Default: Type 1)
Metric type specifies the way to advertise routes to destinations outside the
autonomous system (AS) through External LSAs. Specify Type 1 to add the
internal cost metric to the external route metric. In other words, the cost of the route
from any router within the AS is equal to the cost associated with reaching the
advertising ASBR, plus the cost of the external route. Specify Type 2 to only
advertise the external route metric.
• Redistribute Metric – Metric assigned to all external routes for the specified
protocol. (Range: 1-65535: Default: 10)
The metric value specified for redistributed routes supersedes the Default External
Metric specified in the OSPF / General Configuration screen (page 20-15).
OSPF
AS
RIP, or
static routes
Router
ASBR
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