Lenovo Flex System Fabric CN4093, Application Manual

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CN4093 Application Guide for N/OS 8.4
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:
 Single Number
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.
”
 Multi ‐ octet ( IP address ): Placing the area number in the last octet (0.0.0. n )
Some OSPF vendors express the area ID number in multi ‐ octet format. For
example, “
area
0
.0.0.2
” represents OSPF area 2 and can be specified directly
on the CN4093 as “
area-id 0.0.0.2
”.
On the CN4093, using the last octet in the area ID, “
area 1
” is equivalent to
“
area-id 0.0.0.1
”.
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 commands are as follows:
For example, the following commands could be used to configure IPv4 interface 14
for a presence on the IPv4 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 Enterprise NOS” on page 491 ).
CN 4093(config)# interface ip
<interface number>
CN 4093(config-ip-if)# ip ospf area
<area index>
CN 4093(config-ip-if)# exit
CN 4093(config)# router ospf
CN 4093(config-router-ospf)# area 1 area-id 0.0.0.1
CN 4093(config-router-ospf)# area 1 enable
CN 4093(config-router-ospf)# enable
CN 4093(config-router-ospf)# exit
CN 4093(config)#
i
nterface ip 14
CN 4093(config-ip-if)# ip address 10.10.10.1 255.255.255.0 enable
CN 4093(config-ip-if)# ip ospf area 1
CN 4093(config-ip-if)# ip ospf enable