Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 335)

Configuring default route origination
When the Brocade device is an OSPFv3 Autonomous System Boundary Router (ASBR), you can
configure it to automatically generate a default external route into an OSPFv3 routing domain. This
feature is called "default route origination" or "default information origination."
By default, the Brocade device does not advertise the default route into the OSPFv3 domain. If you
want the device to advertise the OSPF default route, you must explicitly enable default route origination.
When you enable OSPFv3 default route origination, the device advertises a type 5 default route that is
flooded throughout the AS (except stub areas).
The device advertises the default route into OSPF even if OSPF route redistribution is not enabled, and
even if the default route is learned through an IBGP neighbor. The router will not, however, originate
default if the active default route is learned from an OSPF router in the same domain.
NOTE
The Brocade device does not advertise the OSPFv3 default route, regardless of other configuration
parameters, unless you explicitly enable default route origination.
If default route origination is enabled and you disable it, the default route originated by the device is
flushed. Default routes generated by other OSPFv3 routers are not affected. If you re-enable the
feature, the feature takes effect immediately and thus does not require you to reload the software.
For example, to create and advertise a default route with a metric of 2 and as a type 1 external route,
enter the following command.
device(config-ospf6-router)# default-information-originate always metric 2 metric-
type type1
Syntax: [no] default-information-originate [always] [metric value ] [ metric-type type]
The always keyword originates a default route regardless of whether the device has learned a default
route. This option is disabled by default.
The metric value parameter specifies a metric for the default route. If this option is not used, the value
of the default-metric command is used for the route.
The metric-type type parameter specifies the external link type associated with the default route
advertised into the OSPF routing domain. The type can be one of the following:
• 1 - Type 1 external route
• 2 - Type 2 external route
If you do not use this option, the default redistribution metric type is used for the route type.
NOTE
If you specify a metric and metric type, the values are used even if you do not use the always option.
To disable default route origination, enter the no form of the command.
Modifying Shortest Path First timers
The Brocade device uses the following timers when calculating the shortest path for OSPFv3 routes:
• SPF delay - When the Brocade device receives a topology change, the software waits before it starts
a Shortest Path First (SPF) calculation. By default, the software waits 5 seconds. You can configure
Configuring default route origination
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 335
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