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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

area range — router, OSPF

Synopsis

area area-id range address mask
no area area-id range address mask

Configures

OSPF route summarization

Default

None

Description

This command tells the OSPF routing process to summarize selected routes for an area. A single route to the given address is generated, instead of separate routes for the individual networks.

area-id

The area to be summarized.

address

The IP address of the network to summarize.

mask

The mask for the IP address, showing which routes to include in the summary.

Example

The following OSPF configuration summarizes all routes for area 2 into a single route for network 10.0.0.0/8:

router ospf  99
 network 10.0.0.0 0.255.255.255 area 2
 area 2 range 10.0.0.0 255.0.0.0

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