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JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
Aggregating OSPF Networks
area range
250
You can aggregate OSPF networks at the border of an OSPF area by using the area range
command. You can also aggregate OSPF networks when entering the border of the OSPF
domain by using the summary-address command for IP routes and the summary-prefix
command for IPv6 routes.
To create an area range:
Configure the interface's IP addresses using the ip address command.
1.
Enable OSPF using the router ospf command.
2.
Configure the network area with the network area command.
3.
Configure the area range with the area range command.
4.
Use to aggregate OSPF routes at an OSPF area border.
Use only for ABRs.
You can configure multiple instances of the area range command for a single OSPF
area.
By default, the range of configured networks is advertised in type 3 (summary) LSAs.
Use the advertise keyword (IPv6 only) to specify advertisement of configured networks.
Use the do-not-advertise keyword to prevent advertisement of configured networks.
Use the cost keyword (IPv6 only) to define the cost value (0–16777215) for the specified
range of networks.
Use the command no area area-id (with no other keywords) to remove the specified
area from the configuration.
Use the summary-address or summary-prefix command to summarize external routes
being redistributed into OSPF.
Example
host1(config-if)#ip address 2.2.10.1 255.255.255.0
host1(config-if)#ip address 2.2.11.1 255.255.255.0 secondary
host1(config)#router ospf 2
host1(config-router)#network 2.2.0.0 0.0.255.255 area 0
At this point, the OSPF process is configured with two OSPF interfaces. If your router
is an ABR, two networks must be summarized: 2.2.10.0/24 and 2.2.11.0/24.
host1(config-router)#area 0 range 2.2.0.0 255.255.0.0
After you enter this area range command, only the aggregated range 2.2.0.0/16 is going
to be summarized.
Use the no version to disable the aggregation of routes at the OSPF area border.
See area range
Copyright © 2010, Juniper Networks, Inc.
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