Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 223)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 205
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Configuring OSPF
To display the configured summary addresses, use the show ip ospf config command at any level of
the CLI. The summary addresses display at the bottom of the output as shown in the following
example.
Syntax: show ip ospf config
Configuring 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, Brocade 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
Brocade 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. Refer to
“Assigning a Not-So-Stubby Area” on page 181.
To enable default route origination, enter the default-information-originate command.
Brocade(config-ospf-router)#default-information-originate
Brocade#show ip ospf config
some lines omitted for brevity...
OSPF Redistribution Address Ranges currently defined:
Range-Address Subnetmask
10.0.0.0 255.0.0.0
10.0.1.0 255.255.255.0
10.0.2.0 255.255.255.0