Configure Default Route Origination - Foundry Networks Switch and Router Installation And Configuration Manual

Foundry Switch and Router Installation and Configuration Guide
USING THE WEB MANAGEMENT INTERFACE
You cannot configure OSPF route summarization using the Web management interface.

Configure Default Route Origination

When the Layer 3 Switch is an OSPF Autonomous System Boundary Router (ASBR), you can configure it to
automatically generate a default external route into an OSPF routing domain. This feature is called "default route
origination" or "default information origination".
By default, Foundry Layer 3 Switches do not advertise the default route into the OSPF domain. If you want the
Layer 3 Switch to advertise the OSPF default route, you must explicitly enable default route origination.
When you enable OSPF default route origination, the Layer 3 Switch advertises a type 5 default route that is
flooded throughout the AS (except stub areas and NSSAs). In addition, internal NSSA ASBRs advertise their
default routes as translatable type 7 default routes.
The Layer 3 Switch 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.
NOTE: Foundry Layer 3 Switches never advertise the OSPF default route, regardless of other configuration
parameters, unless you explicitly enable default route origination using the following method.
If the Layer 3 Switch is an ASBR, you can use the "always" option when you enable the default route origination.
The always option causes the ASBR to create and advertise a default route if it does not already have one
configured.
If default route origination is enabled and you disable it, the default route originated by the Layer 3 Switch is
flushed. Default routes generated by other OSPF 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.
To enable default route origination, use the following CLI method.
USING THE CLI
To enable default route origination, enter the following command:
BigIron(config-ospf-router)# default-information-originate
To disable the feature, enter the following command:
BigIron(config-ospf-router)# no default-information-originate
Syntax: [no] default-information-originate [always] [metric <value>] [metric-type <type>]
The always parameter advertises the default route regardless of whether the router has 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 default metric
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 you specify are used only if the Layer 3 Switch does
not have a default route, but still wants to advertise one because the always option is configured.
USING THE WEB MANAGEMENT INTERFACE
You cannot configure OSPF default route origination using the Web management interface.
17 - 34 December 2000