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Configuring Global Settings for OSPF
To implement OSPF for a large network, you must first organize the network into logical
areas to limit the number of OSPF routers that actively exchange Link State
Advertisements (LSAs). You can then define an OSPF interface by assigning an IP
interface configured on this switch to one of these groups. This OSPF interface will send
and receive OSPF traffic to neighboring OSPF routers.
You can further optimize the exchange of OSPF traffic by specifying an area range that
covers a large number of subnetwork addresses. This is an important technique for
limiting the amount of traffic exchanged between Area Border Routers (ABRs).
And finally, you must specify a virtual link to any OSPF area that is not physically
attached to the OSPF backbone. Virtual links can also be used to provide a redundant
link between contiguous areas to prevent areas from being partitioned, or to merge
backbone areas.
The following menu items provide all the global configuration options for OSPF:
Parameter Description
Area ID
Configuration
Defines a area within which all OSPF routers actively exchange
routing information to ensure that they all have an identical link
state database.
OSPF Area Range
Configuration
Defines a range of subnetwork addresses. An area range is used
to summarize route information exchanged between Area Border
Routers.
OSPF Virtual Link
Configuration
Defines a virtual link that can be used to connect an OSPF area
not physically adjacent to the OSPF backbone, or to create a
backup link to any area.
OSPF Host Route
Configuration
Configures the route to a specific host within the area.
OSPF Area Configuration
OSPF protocol broadcast messages (i.e., Link State Advertisements) are restricted by
area to limit their impact on network performance. Before assigning an Area ID to a
specific OSPF interface (see chapter 3 “Configuring OSPF”), you must first specify the
Area ID in this table. Each entry in this table identifies a logical group of OSPF routers
that actively exchange Link State Advertisements (LSAs) to ensure that they share an
identical view of the network topology. You can configure the area as a normal one
which can send and receive external Link State Advertisements (LSAs), a stubby area
that cannot send or receive external LSAs, or a not-so-stubby area (NSSA) that can
import external route information into its area.