Microsoft ES4649 Manuel D’Utilisation
IP Routing Commands
4-267
4
default-information originate
This command generates a default external route into an autonomous system. Use
the no form to disable this feature.
the no form to disable this feature.
Syntax
default-information originate [always] [metric interface-metric]
[metric-type metric-type]
no default-information originate
• always - Always advertise a default route to the local AS regardless of
whether the router has a default route. (See “ip route” on page 4-250.)
• interface-metric - Metric assigned to the default route.
(Range: 1-65535; Default: 10)
• metric-type - External link type used to advertise the default route.
(Options: Type 1, Type 2; Default: Type 2)
Command Mode
Router Configuration
Default Setting
Disabled
Command Usage
• 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
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.)
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.
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
routes, the internal cost is only used as a tie-breaker if several Type 2 routes
have the same cost.
routes, the internal cost is only used as a tie-breaker if several Type 2 routes
have the same cost.
Example
This example assigns a metric of 20 to the default external route advertised into an
autonomous system, sending it as a Type 2 external metric.
This example assigns a metric of 20 to the default external route advertised into an
autonomous system, sending it as a Type 2 external metric.
Console(config-router)#default-information originate metric 20
metric-type 2
Console(config-router)#
metric-type 2
Console(config-router)#