From: gigi.ccie@gmail.com
Date: Sun May 21 2006 - 13:24:53 ART
http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2003.htm#wp3618
Now this is a proper reference to this type of question. But as you can see, it does not quite answer the question.
Step 1 Define your structure (identify areas and allocate nodes to areas).
Step 2 Assign addresses to networks, subnets, and end stations.
In the network illustrated in , each area has its own unique NIC-assigned address. These can be Class A (the backbone in ), Class B (areas 4 and 6), or Class C (Area 5). The following are some clear benefits of assigning separate address structures to each area:
Address assignment is relatively easy to remember.
Configuration of routers is relatively easy and mistakes are less likely.
Network operations are streamlined because each area has a simple, unique network number.
The main drawback of this approach to address assignment is that it wastes address space. If you decide to adopt this approach, be sure that area border routers are configured to do route summarization. Summarization must be explicitly set; it is disabled by default in OSPF.
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