User's Manual Part 2
39JadeOSUserManual
mit-delay
<value>
transmitalinkstateupdatepacketonanOSPFin‐
terf ace.
Table6‐1OSPFInterfaceParameter
6.7.4ConfiguringOSPFArea
JadeOSOSPFsupportsthefollowingtypesofarea:
z Stubarea
Stubareasareareasin towhichinformation on externalroutesisnotsent.Instead,
thereis a default external route generated bythe areaborder router, into the stub
areafordestinationsoutsidetheautonomoussystem.TotakeadvantageoftheOSPF
stub area support, default routing must be in the stub area, you can configure
no‐summaryontheABRtopreventitfromsendingsummarylinkadvertisementinto
thestubarea.
ToconfigureastubareaonJadeOS,usethefollowingcommand:
area <area-id> stub [no-summary]
Forexample,configurearea1.1.1.1asstubareaonJadeOS:
(JadeOS) (config) #router ospf
(JadeOS) (config-router) # area 2 stub no-summary
z NSSA(NotSoStubbyArea)area
NSSA area is similar to OSPF stub area. NSSA does not flood Type 5 (External Link
State Advertisements)LSA form the core into the area, but it has the ability of im‐
portingASexternalroutesinalimitedfashionwithinthearea.NSSAallowsimporting
of Type 7 AS external routes within NSSA areaby redistribution. These Type 7 LSAs
aretranslatedintoType5LSAsbyNSSAABRwhicharefloodedthroughoutthewhole
routingdomain.
ToconfigureaNSSAareaonJadeOS,usethefollowingcommand:
area <area-id> nssa [ no-redistribution ] [no-summary ] [de-
fault-information-originate]
Example1,configurearea1.1.1.1astotallyNSSAareaonJadeOS:
(JadeOS)(config)# router ospf
(JadeOS) (config-router) # area 1 nssa no-summary
Example2,configurearea1.1.1.1asnon‐totallyNSSAarea,notimportingtype‐7ex‐
ternalroutestothearea:
(JadeOS)(config)# router ospf area 1.1.1.1
(JadeOS)(config-router) # nssa no-redistribution
Example3,configurearea1.1.1.1asnon‐totallyNSSAarea,importingadefaultroute
tothearea: