Brocade BigIron RX Series Configuration Guide - Manual (Page 861)

BigIron RX Series Configuration Guide 783
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Configuring OSPF
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NOTE
This option affects only imported, type 5 external routes. A single type 5 LSA is generated and
flooded throughout the AS for multiple external routes. Type 7-route redistribution is not affected by
this feature. All type 7 routes will be imported (if redistribution is enabled). To summarize type 7 LSAs
or exported routes, use NSSA address range summarization.
To configure a summary address for OSPF routes, enter commands such as the following.
BigIron RX(config-ospf-router)# summary-address 10.1.0.0 255.255.0.0
The command in this example configures summary address 10.1.0.0, which includes addresses
10.1.1.0, 10.1.2.0, 10.1.3.0, and so on. For all of these networks, only the address 10.1.0.0 is
advertised in external LSAs.
Syntax: summary-address <ip-addr> <ip-mask>
The <ip-addr> parameter specifies the network address.
The <ip-mask> parameter specifies the network mask.
To display the configured summary addresses, enter the following command at any level of the CLI.
BigIron RX(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 BigIron RX 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, the BigIron RX does not advertise the default route into the OSPF domain. If you want
the BigIron RX to advertise the OSPF default route, you must explicitly enable default route
origination.
When you enable OSPF default route origination, the BigIron RX 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 BigIron RX 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
BigIron RX never advertises the OSPF default route, regardless of other configuration parameters,
unless you explicitly enable default route origination using the following method.
If the BigIron RX 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.