Nokia IPSO 4.0 manual Nssa Not So Stubby Area Parameters, 358

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Table 23 NSSA (Not So Stubby Area) Parameters

Parameter	Description
Translator Role	Specifies whether this NSSA border router will unconditionally translate
	Type-7 LSAs into Type-5 LSAs. When role is Always, Type-7 LSAs are
	translated into Type-5 LSAs regardless of the translator state of other NSSA
	border routers. When role is Candidate, this router participates in the
	translator election to determine if it will perform the translations duties. If this
	NSSA router is not a border router, then this option has no effect.
	Default: Candidate.
Translator Stability	Specifies how long in seconds this elected Type-7 translator will continue to
Interval	perform its translator duties once it has determined that its translator status
	has been assumed by another NSSA border router. This field appears only if
	an area is defined as an NSSA with translator role as Candidate. Default: 40
	seconds.
Import Summary Routes	Specifies if summary routes (summary link advertisements) are imported
	into 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.
Cost for Default Route	Enter a cost associated with the default route to the NSSA.
Default Route Type	Specifies the route type associated with the Type-7 default route for an
	NSSA when routes from other protocols are redistributed into OSPF as
	ASEs. If a redistributed route already has a route type, this type is
	maintained. If summary routes are imported into an NSSA, only then a Type-
	7 default route is generated (otherwise a Type-3 default route is generated).
	This field appears only if an area is defined as an NSSA into which summary
	routes are imported.
	The route type can be either 1 or 2. A type 1 route is internal and its metric
	can be used directly by OSPF for comparision. A type 2 route is external and
	its metric cannot be used for comparision directly. Default: 1
Redistribution	Specifies if both Type-5 and Type-7 LSAs or only Type-7 LSAs will be
	originated by this router. This option will have effect only if this router is an
	NSSA border router and this router is an AS border router. Default: On
Type 7 Address Ranges	An NSSA border router that performs translation duties translates Type-7
	LSAs to Type-5 LSAs. An NSSA border router can be configured with Type-
	7 address ranges. Use these ranges to reduce the number of Type-5 LSAs.
	Many separate Type-7 networks may fall into a single Type-7 address range.
	These Type-7 networks are aggregated and a single Type-5 LSA is
	advertised. By definition, a Type-7 address range consists of a prefix and a
	mask length.
	Note: To prevent a specific prefix from being advertised, select On in the
	Restrict field next to the entry for that prefix.

To configure OSPF, use the following procedure.

358 Nokia Network Voyager for IPSO 4.0 Reference Guide