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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.
Summary of Contents for FastIron Edge Switch X424
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