Using The Area Id To Assign The Ospf Area Number; Attaching An Area To A Network - IBM RackSwitch G8000 Application Manual

Using the Area ID to Assign the OSPF Area Number

Attaching an Area to a Network

© Copyright IBM Corp. 2011
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.
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:
interface ip <interface number>
RS G8000(config)#
RS G8000(config-ip-if)#
RS G8000(config-ip-if)#
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:
RS G8000(config)# router ospf
RS G8000(config-router-ospf)# area 1 a
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
Note: OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see
Implementation in IBM N/OS" on page
ip ospf area <area index>
exit
rea-id 0.0.0.1
279).
"OSPFv3
263
Chapter 22. OSPF