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ospf enable
Copyright © 2010, Juniper Networks, Inc.
Use to configure a range of OSPFv2 interfaces and their related area.
If the specified range matches one or more of the IP addresses configured for IP
interfaces, one or more corresponding OSPF interfaces are created and placed in the
specified area.
Create address ranges that do not overlap; you can attach only the same range of
interfaces to a single area.
You cannot use this command for unnumbered interfaces.
If the range specified by this command includes an address on an interface that is
being referred to by unnumbered interfaces, all of the unnumbered interfaces begin
trying to form adjacencies. If this behavior is not intended, you must reevaluate the
interface assignment or the range specified by the command.
Example 1—shows the creation of one OSPF interface in the backbone area
host1(config-if)#ip address 2.2.2.1 255.255.0.0
host1(config-if)#ip address 2.2.1.1 255.255.0.0 secondary
host1(config)#router ospf 2
host1(config-router)#network 2.2.2.0 0.0.0.255 area 0
Example 2—shows the creation of two OSPF interfaces, one in the backbone area and
one in a non-backbone area
host1(config-if)#ip address 2.2.2.1 255.255.255.0
host1(config-if)#ip address 2.2.1.1 255.255.255.0 secondary
host1(config)#router ospf 2
host1(config-router)#network 2.2.2.0 0.0.0.255 area 0
host1(config-router)#network 2.2.1.0 0.0.0.255 area 1
This sequence of commands creates two OSPF ranges (2.2.2.0/24 and 2.2.1.0/24),
with each range belonging to a different area. Area 0 is configured for 2.2.2.0/24, and
area 1 is configured for 2.2.1.0/24. This sequence also creates two OSPF interfaces:
one in the backbone area (area 0) using IP address 2.2.2.1, the second in a nonbackbone
area (area 1) using IP address 2.2.1.1. This command also creates the two areas if they
do not already exist.
Use the no version to delete OSPF interfaces, ranges, and areas.
NOTE: Until you activate the configured network range for summaries by
issuing the area range command, the range is not active for summarization;
the network range is summarized through area summaries—for ABRs only.
(See "Aggregating OSPF Networks" on page 250 .) The only range that is
active by default if you do not issue the area range command is the network
that matches the IP interface's network exactly. (In other words, by default
the exact network of the IP interface is going to be summarized into other
areas.)
See network area
Chapter 5: Configuring OSPF
247
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