Foundry Networks FESX User Manual

Configuring OSPF
December 2005 © Foundry Networks, Inc. 20 - 31
The <ip-mask> parameter specifies the network mask.
To display the configured summary addresses, enter the following command at any level of the CLI:
FESX424 Router(config-ospf-router)# show ip ospf config
OSPF Redistribution Address Ranges currently defined:
Range-Address Subnetmask
1.0.0.0 255.0.0.0
1.0.1.0 255.255.255.0
1.0.2.0 255.255.255.0
Syntax: show ip ospf config
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.
NOTE: The ABR (Layer 3 Switch) will not inject the default route into an NSSA by default and the command
described in this section will not cause the Layer 3 Switch to inject the default route into the NSSA. To inject the
default route into an NSSA, use the area <num> | <ip-addr> nssa default-information-originate command. See
“Assign a Not-So-Stubby Area (NSSA)” on page 20-12.
To enable default route origination, enter the following command:
FESX424 Router(config-ospf-router)# default-information-originate
To disable the feature, enter the following command:
FESX424 Router(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.

Foundry Networks FESX Specifications

General

Brand	Foundry Networks
Model	FESX
Category	Switch
Language	English