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JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide
Aggregating OSPF Networks
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:
1.
2.
3.
4.
area range
256
Aggregating OSPF Networks
Use to specify a different IP address for the router to use as the OSPF router ID.
Example
host1(config-if)#router-id 192.168.50.5
Use the no version to force OSPF to use the previous OSPF router ID behavior.
See router-id
Configure the interface's IP addresses using the ip address command.
Enable OSPF using the router ospf command.
Configure the network area with the network area command.
Configure the area range with the area range command.
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
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