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area stub
This command defines a stub area. To remove a stub, use the no form
without the optional keyword. To remove the summary attribute, use the no
form with the summary keyword.
Syntax
[no] area area-id stub [summary]
• area-id - Identifies the stub area.
(The area ID must be in the form of an IP address.)
• summary - Makes an Area Border Router (ABR) send a summary link
advertisement into the stub area. (Default: no summary)
Command Mode
Router Configuration
Default Setting
No stub is configured.
Command Usage
• All routers in a stub must be configured with the same area ID.
• Routing table space is saved in a stub by blocking Type-4 AS summary
LSAs and Type 5 external LSAs. The default setting for this command
completely isolates the stub by blocking Type-3 summary LSAs that
advertise the default route for destinations external to the local area or
the autonomous system.
•Use the area default-cost command to specify the cost of a default
summary route sent into a stub by an ABR.
• This router supports up to 16 total areas (either normal transit areas,
stubs, or NSSAs).
Example
This example creates a stub area 10.2.0.0, and assigns all interfaces with class
B addresses 10.2.x.x to the stub.
Console(config-router)#area 10.2.0.0 stub
Console(config-router)#network 10.2.0.0 0.255.255.255 area 10.2.0.0
Console(config-router)#