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area virtual-link
20-24 IPv4 Routing Protocol Configuration
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 virtual-link
UsethiscommandtodefineanOSPFvirtuallink,whichrepresentsalogicalconnectionbetween
thebackboneandanon‐backboneOSPFarea.Thenoformofthiscommandremovesthevirtual
linkand/oritsassociatedsettings.
Syntax
area area-id virtual-link router-id
no area area-id virtual-link router-id
Inadditiontothesyntaxabove,theoptionsforusingthiscommandare:
area area-id virtual-link router-id authentication-key key
no area area-id virtual-link router-id authentication-key key
area area-id virtual-link router-id dead-interval seconds
no area area-id virtual-link router-id dead-interval seconds
area area-id virtual-link router-id hello-interval seconds
no area area-id virtual-link router-id hello-interval seconds
area area-id virtual-link router-id retransmit-interval seconds
no area area-id virtual-link router-id retransmit-interval seconds
area area-id virtual-link router-id transmit-delay seconds
no area area-id virtual-link router-id
transmit-delay seconds
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.