Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
6.20.10.8 Redistributing External Routes
The router can be configured to import external routing information from other
routing protocols into the autonomous system.
Figure 208 Redistributing External Routes
Command Usage
• This router supports redistribution for both RIP and static routes.
• When external routes are redistributed 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
through 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 438).
• 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 external route metric.
• The metric value specified for redistributed routes supersedes the
Default External Metric specified in the OSPF / General Configuration
screen (page 438).
OSPF
AS
RIP, or
static routes
Router ASBR