24-Port Layer 3 Switch Management Guide

IP R
OUTING
C
OMMANDS
4-249
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 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 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.
Related Commands
ip route (4-227)
redistribute (4-254)
Console(config-router)#default-information originate metric 20
metric-type 2
Console(config-router)#