Dell PowerConnect B-RX Configuration Manual page 1288

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Configuring OSPFv3
Assigning a totally stubby area
By default, the Brocade device sends summary LSAs (LSA type 3) into stub areas. You can further
reduce the number of LSAs sent into a stub area by configuring the Brocade device to stop sending
summary LSAs into the area. You can disable the summary LSAs when you are configuring the stub
area or later after you have configured the area.
This feature disables origination of summary LSAs into a stub area, but the Brocade device still
accepts summary LSAs from OSPF neighbors and floods them to other areas. The Brocade device
can form adjacencies with other routers regardless of whether summarization is enabled or
disabled for areas on each router.
When you disable the summary LSAs, the change takes effect immediately. If you apply the option
to a previously configured area, the router flushes all of the summary LSAs it has generated (as an
ABR) from the area.
NOTE
This feature applies only when the Brocade device is configured as an Area Border Router (ABR) for
the area. To completely prevent summary LSAs from being sent to the area, disable the summary
LSAs on each OSPF router that is an ABR for the area.
For example, to disable summary LSAs for stub area 40 and specify an additional metric of 99,
enter the following command.
BigIron RX(config-ospf6-router)# area 40 stub 99 no-summary
Syntax: area <number> | <ipv4-address> stub <metric> [no-summary]
The <number> | <ipv4-address> parameter specifies the area number, which can be a number or
in IPv4 address format. If you specify a number, the number can be from 0 – 2,147,483,647.
The stub <metric> parameter specifies an additional cost for using a route to or from this area and
can be from 1 – 16777215. There is no default. Normal areas do not use the cost parameter.
The no-summary parameter applies only to stub areas and disables summary LSAs from being sent
into the area.
Assigning interfaces to an area
After you define OSPFv3 areas, you must assign router interfaces to the areas. All router interfaces
must be assigned to one of the defined areas on an OSPF router. When an interface is assigned to
an area, all corresponding subnets on that interface are automatically included in the assignment.
For example, to assign Ethernet interface 3/1 to area 192.5.0.0, enter the following commands.
BigIron RX(config)# interface Ethernet 3/1
BigIron RX(config-if-e100-3/1)# ipv6 ospf area 192.5.0.0
Syntax: [no] ipv6 ospf area <number> | <ipv4-address>
The <number> | <ipv4-address> parameter specifies the area number, which can be a number or
in IPv4 address format. If you specify a number, the number can be from 0 – 2,147,483,647.
To remove the interface from the specified area, use the no form of this command.
1212 BigIron RX Series Configuration Guide
53-1002253-01