To configure an area as stub or
totally stubby, perform the following steps:
- Configure OSPF, as described in the "Configuring
OSPF ABRs" section.
- Define an area as stub/totally stubby by adding the
following command to all routers within the area:
router(config-router)#area area-id stub [no-summary]

The
area stub
command is configured on each router in the
stub location, which is essential for the routers to become
neighbors and exchange routing information. When this command is
configured, the stub routers exchange hello packets with the E bit
set to 0. The state of this bit must be agreed upon, otherwise, the
routers will not become neighbors.
- (Optional for ABRs only) Define the cost of the default
route that is injected in the stub/totally stubby area, as
follows:
router(config-router)#area area-id default-cost
cost

Note To
reduce the number of route entries that internal routers maintain,
you can define the area as stub, totally stubby, or not so stubby.
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