Nokia IPSO 4.0 Reference Manual page 357

Configuring OSPF Areas and Global Settings
Table 21
on your system. As you add areas, each is displayed with its own configuration parameters under
the Areas section.
Table 21 OSPF Area Configuration Parameters
Parameter
Add New
Address Range
Add New Stub
Network
Area Type
Table 22
the area as a stub area.
Table 22 Stub Area Parameters
Parameter
Cost for Default Route
Import Summary Routes Specifies if summary routes (summary link advertisements) are imported into
Table 23
define the area as an NSSA (Not So Stubby Area). For more information on NSSA, see RFC
3101.
Nokia Network Voyager for IPSO 4.0 Reference Guide
lists the parameters for areas and global settings that you use when configuring OSPF
Description
You can configure any area with any number of address ranges. Use these ranges to
reduce the number of routing entries that a given area emits into the backbone and
thus all areas. If a given prefix aggregates a number of more specific prefixes within
an area, you can configure an address that becomes the only prefix advertised into
the backbone. You must be careful when configuring an address range that covers
parts of a prefix not contained within the area. By definition, an address range consists
of a prefix and a mask length.
Note: You can prevent a specific prefix from being advertised into the backbone, by
selecting On in the Restrict field next to the entry for that prefix.
OSPF can advertise reachability to prefixes that are not running OSPF using a stub
network. The advertised prefix appears as an OSPF internal route and can be filtered
at area borders with the OSPF area ranges. The prefix must be directly reachable on
the router where the stub network is configured; that is, one of the router's interface
addresses must fall within the prefix to be included in the router-LSA. You configure
stub hosts by specifying a mask length of 32.
This feature also supports advertising a prefix and mask that can be activated by the
local address of a point-to-point interface. To advertise reachability to such an
address, enter an IP address for the prefix and a cost with a value other than zero.
Choose Normal, Stub, or NSSA. For descriptions of area types, see
on page 354.
describes the configuration parameters for stub areas. These fields appear if you define
Description
Enter a cost for the default route to the stub area. Range: 1-16777215. There
is no default.
the stub area or NSSA. Each summary link advertisement describes a route
to a destination outside the area, yet still inside the AS (i.e. an inter-area
route). These include routes to networks and routes to AS boundary routers.
Default: On.
describes the configuration parameters for NSSA areas. These fields appear if you
"Types of Areas"
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