Specifications

area nssa
16-26 IPv4 Routing Protocol Configuration
area nssa
UsethiscommandtoconfigureanareaasaNotSoStubbyArea(NSSA).The noformofthis
commandchangestheNSSAbacktoaplainarea.
Syntax
area area-id nssa [default-information-originate]
no area area-id nssa [default-information-originate]
Parameters
Defaults
Ifdefault‐information‐originateisnotspecified,nodefaulttypewillbegenerated.
Mode
Routerconfiguration:C3(su)‐>router(Config‐router)#
Usage
AnNSSAallowssomeexternalroutesrepresentedbyexternalLinkStateAdvertisements(LSAs)
tobeimportedintoit.Thisisincontrasttoastubareathatdoesnotallowanyexternalroutes.
ExternalroutesthatarenotimportedintoanNSSAcanberepresentedbymeansofadefault
route.
ThisconfigurationisusedwhenanOSPFinternetworkisconnectedtomultiplenon‐OSPF
routingdomains.
Example
Thisexampleshowshowtoconfigurearea10asanNSSAarea:
C3(su)->router(Config)#router ospf 1
C3(su)->router(Config-router)#area 10 nssa default-information-originate
area‐id SpecifiestheNSSAarea.ValidvaluesaredecimalvaluesorIPaddresses.
default‐
information‐
originate
(Optional)GeneratesadefaultofType7intotheNSSA.Thisisusedwhen
therouterisanNSSAABR.