© Copyright IBM Corp. 2011 Chapter 22. OSPF 263
Using the Area ID to Assign the OSPF Area Number
The OSPF area number is defined in the
areaid
<IP address> option. The octet
format is used to be compatible with two different systems of notation used by other
OSPF network vendors. There are two valid ways to designate an area ID:
•
Placing the area number in the last octet (0.0.0.
n
)
Most common OSPF vendors express the area ID number as a single number.
For example, the Cisco IOS-based router command “
network 1.1.1.0
0.0.0.255
area 1
” defines the area number simply as “
area 1.
” On the
G8000, using the last octet in the area ID, “
area 1
” is equivalent to
“
area-id 0.0.0.1
”.
•
Multi-octet (
IP address
)
Some OSPF vendors express the area ID number in multi-octet format. For
example, “
area
2.2.2.2
” represents OSPF area 2 and can be specified
directly on the G8000 as “
area-id 2.2.2.2
”.
Note: Although both types of area ID formats are supported, be sure that the area
IDs are in the same format throughout an area.
Attaching an Area to a Network
Once an OSPF area has been defined, it must be associated with a network. To
attach the area to a network, you must assign the OSPF area index to an IP
interface that participates in the area. The format for the command is as follows:
For example, the following commands could be used to configure IP interface 14 for
a presence on the 10.10.10.1/24 network, to define OSPF area 1, and to attach the
area to the network:
Note: OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see “OSPFv3
Implementation in IBM N/OS” on page 279).
RS G8000(config)# interface ip <interface number>
RS G8000(config-ip-if)# ip ospf area <area index>
RS G8000(config-ip-if)# exit
RS G8000(config)# router ospf
RS G8000(config-router-ospf)# area 1 area-id 0.0.0.1
RS G8000(config-router-ospf)# enable
RS G8000(config-router-ospf)# exit
RS G8000(config)#
interface ip 14
RS G8000(config-ip-if)# ip address 10.10.10.1
RS G8000(config-ip-if)# ip netmask 255.255.255.0
RS G8000(config-ip-if)# enable
RS G8000(config-ip-if)# ip ospf area 1
RS G8000(config-ip-if)# ip ospf enable
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