Dell Brocade DCX, Configuration Manual

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1202 BigIron RX Series Configuration Guide
53-1001810-01
Configuring OSPFv3
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Stub – OSPF routers within a stub area cannot send or receive External LSAs. In addition, OSPF
routers in a stub area must use a default route to the area’s Area Border Router (ABR) or
Autonomous System Boundary Router (ASBR) to send traffic out of the area.
For example, to set up OSPFv3 areas 0.0.0.0, 200.5.0.0, 192.5.1.0, and 195.5.0.0, enter the
following commands.
BigIron RX(config-ospf6-router)# area 0.0.0.0
BigIron RX(config-ospf6-router)# area 200.5.0.0
BigIron RX(config-ospf6-router)# area 192.5.1.0
BigIron RX(config-ospf6-router)# area 195.5.0.0
Syntax: [no] 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.
NOTE
You can assign one area on a router interface.
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-addres s> 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.