Example
Console(config-router)#timers spf 20
Console(config-router)#
area range
This command summarizes the routes advertised by an Area Border Router (ABR).
Use the
no
form to disable this function.
Syntax
[no] area area-id range ip-address netmask [advertise | not-advertise]
• area-id - Identifies an area for which the routes are summarized.
(The area ID must be in the form of an IPv 4 addre ss.)
• ip-address - Base address for the routes to summariz e.
• netmask - Network mask for the summary route.
• advertise - Advertises the specified address range.
• not-advertise - The summary is not sent, and the routes re main hidden
from the rest of the network.
Command Mode
Router Configuration
Default Setting
Disabled
Command Usage
• This command can be used to summarize intra-area routes and advertise this
information to other areas through Area Border Routers (ABRs).
• If the network addresses within an area are assigned in a contiguous manner,
the ABRs can advertise a summary route that covers all of the individual
networks within the area that fall into the spec ified range using a single ar ea
range command.
• If routes are set to be advertised, the router will issue a T ype 3 summary LSA
for each address range specified with this command.
• This router supports up 64 summary routes for area ranges.
Example
This example creates a summary address for all are a rou te s in th e ran ge of 10. 2.x.x.
Console(config-router)#area 10.2.0.0 range 10.2.0.0 255.255.0.0 advertise
Console(config-router)#
42-23
Open Shortest Path First (OSPF)
42