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Command Usage
• When RFC 1583 compatibility is enabled, only cost is used when choosing
among multiple AS-external LSAs advertising the same destination. When
disabled, preference is based on type of path, using cost only to break ties
(see RFC 2328).
• All routers in an OSPF routing domain should use the same RFC for
calculating summary routes.
• If there are any OSPF routers in an area exchanging summary information
(specifically, ABRs) which have not been upgraded to OSPFv2, this command
should be used on the newly upgraded OSPFv2 routers to ensure
compatibility with routers still running older OSPFv2 code. Once all systems
have been upgraded to newer OSPFv2 code, use the no form of this
command to restore compatibility for all systems with RFC 2328.
Example
Console(config-router)#compatible rfc1583
Console(config-router)#
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 - Always advertise a default route to the local AS regardless of
whether the router has a default route. (See “ip route” on page 42-2.)
• 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
Metric: 10 (with always option), 1 (without always option)
Metric Type: 2
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
42-21
Open Shortest Path First (OSPF)
42