Cisco NCS 5500 Series Configuration Manuals page 65

Implementing OSPF
Enters area configuration mode and configures a nonbackbone area for the OSPF process.
• The area-id argument can be entered in dotted-decimal or IPv4 address notation, such as area 1000 or area 0.0.3.232.
However, you must choose one form or the other for an area. We recommend using the IPv4 address notation.
Step 5
Do one of the following:
• stub [ no-summary ]
• nssa [ no-redistribution ] [ default-information-originate ] [ no-summary ]
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)# stub no summary
or
RP/0/RP0/CPU0:router(config-ospf-ar)# nssa no-redistribution
Defines the nonbackbone area as a stub area.
• Specify the no-summary keyword to further reduce the number of LSAs sent into a stub area. This keyword prevents
the ABR from sending summary link-state advertisements (Type 3) in the stub area.
or
Defines an area as an NSSA.
Step 6 Do one of the following:
• stub
• nssa
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)# stub
or
RP/0/RP0/CPU0:router(config-ospf-ar)# nssa
(Optional) Turns off the options configured for stub and NSSA areas.
• If you configured the stub and NSSA areas using the optional keywords ( no-summary , no-redistribution ,
default-information-originate , and no-summary ) in Step 5, you must now reissue the stub and nssa commands
without the keywords—rather than using the no form of the command.
• For example, the no nssa default-information-originate form of the command changes the NSSA area into a normal
area that inadvertently brings down the existing adjacencies in that area.
Step 7 default-cost cost
Example:
RP/0/RP0/CPU0:router(config-ospf-ar)#default-cost 15
(Optional) Specifies a cost for the default summary route sent into a stub area or an NSSA.
• Use this command only on ABRs attached to the NSSA. Do not use it on any other routers in the area.
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
Configure Stub and Not-So-Stubby Area Types
53