Nortel Web OS 10.0, Application Manual

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Web OS 10.0 Application Guide
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Chapter 4: OSPF
212777-A, February 2002
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:
n
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 Web switch, using the last octet in
the area ID, “
area 1
” is equivalent to “
areaid 0.0.0.1
”.
n
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 Web
switch as “
areaid 2.2.2.2
”.
N
OTE
– 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 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/ip/ospf/if
<interface number>
/aindex
<area index>
>> # /cfg/ip/if 14
(Select menu for IP interface 14)
>> IP Interface 14# addr 10.10.10.1
(Define IP address on backbone
network)
>> IP Interface 14# mask 255.255.255.0
(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
14)
>> OSPF Interface 14# enable (Enable interface 14 for area index 1)