Command:

area


Mode:

Router(config-router)#


Syntax:

area area-id { authentication [message-digest] | stub [no-summary] | nssa [no-redistribution] [default-information-originate] | default-cost cost | range address mask [advertise | not-advertise] | virtual-link router-id }

no area area-id [ authentication [message-digest] | stub [no-summary] | nssa [no-redistribution] [default-information-originate] | default-cost cost | range address mask [advertise | not-advertise] | virtual-link router-id ]

 

Syntax Description:

authentication

Enables authentication for an OSPF area

stub

Specifies a stub area to reduce routing overhead. To further reduce the number of link state advertisements (LSA) sent into a stub area, you can configure no-summary on the ABR to prevent it from sending summary LSAs (LSA type 3) into the stub area.

nssa

Specifies a not-so-stubby area. A not-so-stubby area provides the benefits of a stub area, while allowing the router to import external routes.

default-cost

Specifies a cost for the default summary route sent into a stub area

range

Use to consolidate and summarize routes at an area boundary

virtual-link

In OSPF, all areas must be connected to a backbone area (area 0). If the connection to the backbone is lost, it can be repaired by establishing a virtual link.

 


Command Description:

 

Use the area command to configure area parameters such as authentication and summarization.


Example:

 

Router(config-router)#area 2 range 192.168.0.1 255.255.240.0


Misconceptions:

 

None


Related Commands:

 

None


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