Chapter 29
| IP Routing Commands
Open Shortest Path First (OSPFv2)
– 841 –
default-information
originate
This command generates a default external route into an autonomous system. Use
the no form to disable this feature.
Syntax
default-information originate [always] [metric interface-metric] [metric-
type metric-type]
no default-information originate [always | metric | metric-type]
always - Always advertise itself as a default external route for the local AS
regardless of whether the router has a default route. (See “ip route” on
page 803.)
interface-metric - Metric assigned to the default route. (Range: 0-16777214)
metric-type - External link type used to advertise the default route.
(Options: Type 1, Type 2)
Command Mode
Router Configuration
Default Setting
Disabled
Metric: 20
Metric Type: 2
Command Usage
◆ If the always parameter is not selected, the router can only advertise a default
external route into the AS if it has been configured to import external routes
through other routing protocols or static routing, and such a route is known.
(See the redistribute command.)
◆ The metric for the default external route is used to calculate the path cost for
traffic passed from other routers within the AS out through the ASBR.
◆ When you use this command to redistribute routes into a routing domain (i.e.,
an Autonomous System, this router automatically becomes an Autonomous
System Boundary Router (ASBR). However, an ASBR does not, by default,
generate a default route into the routing domain.
■
If you use the always keyword, the router will advertise itself as a default
external route into the AS, even if a default external route does not actually
exist. To define a default route, use the ip route command.
■
If you do not use the always keyword, the router can only advertise a
default external route into the AS if the redistribute command is used to
import external routes via RIP or static routing, and such a route is known.
◆ Type 1 route advertisements add the internal cost to the external route metric.
Type 2 routes do not add the internal cost metric. When comparing Type 2
To Next Page
Loading...
Need help?
General