HP 600 Series, Services And Applications

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Figure 3. Area 1.0.0.0 Topological Database
Figure 3 shows a summary of the topological database of area 1.0.0.0 (from
figure 2). Each router that is a member of area 1.0.0.0 has a copy of this data-
base.
One aspect of the use of areas is that it simplifies the database. Notice that
routers in area 0.0.0.0 and 2.0.0.0 do not appear in the topological database,
although the networks in those areas do.
Conserving IP Address Space
On internets using RIP, the subnet mask used throughout the internet must
be identical on all subnets. The information about individual networks in-
cluded in a RIP update includes the network (or subnet) number and metric
(hop count). RIP updates do not include the subnet mask associated with a
network. This often results in the over-allocation of IP address space—
especially on synchronous point-to-point links.
NET 1, Metric 40
NET 8, Metric 130
NET 9, Metric 40
NET 10, Metric 80
NET 11, Metric 40
NET 12, Metric 50
NET 13, Metric 90
NET 2
Metric 10
1.1.1.1
NET 4
Metric 110
NET 3
Metric 110
NET 7
Metric 10
NET 6
Metric 10
NET 5
Metric 40
1.2.1.1 1.0.0.1
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Routing with OSPF
Conserving IP Address Space
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