Alteon OS Application Guide

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 in order to be compatible with two different systems of notation used by other OSPF net- work 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 exam- ple, 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 GbE Switch Module, using the last octet in the area ID, “area 1” is equivalent to “areaid 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 GbE Switch Module as “areaid 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:

>># /cfg/l3/ospf/if <interface number>/aindex <area index>

For example, the following commands could be used to configure IP interface 14 for a pres- ence on the 10.10.10.1/24 network, to define OSPF area 1, and to attach the area to the net- work:

>> # /cfg/l3/if

14

10.10.10.1

(Select menu for IP interface 14)

>> IP Interface

14# addr

(Define IP address on backbone

>> IP Interface

14# mask

255.255.255.0

network)

(Define IP mask on backbone)

>> IP Interface

14# ena

 

(Enable IP interface 14)

>> IP Interface

14# ../ospf/aindex 1

(Select menu for area index 1)

>> OSPF Area (index) 1 #

areaid 0.0.0.1

(Define area ID as OSPF area 1)

>> OSPF Area (index) 1 #

ena

(Enable area index 1)

>> OSPF Area (index) 1 #

../if 14

(Select OSPF menu for interface 14)

>> OSPF Interface 14# aindex 1

(Attach area to network on interface

>> OSPF Interface 14# enable

14)

(Enable interface 14 for area index 1)

42C4911, January 2007

Chapter 12: OSPF „ 195

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Nortel Networks 42C4911 manual Using the Area ID to Assign the Ospf Area Number, Attaching an Area to a Network
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42C4911 specifications

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Overall, the Nortel Networks 42C4911 stands out as a versatile and powerful component in the telecommunications landscape. Its modular design, compatibility with diverse technologies, reliability, and emphasis on security make it an appealing choice for organizations looking to enhance their networks. As companies continue to navigate the complexities of communication, devices like the 42C4911 play a crucial role in ensuring that they remain connected and efficient.
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