CCIE Fundamentals: Network Design and Case Studies, Second Edition

Appendix A. Subnetting an IP Address Space

This appendix provides a partial listing of a Class B area intended to be divided into approximately 500 Open Shortest Path First (OSPF) areas. For the purposes of this example, the network is assumed to be a Class B network with the address 150.100.0.0.

Note

Although a 500-area OSPF network is unrealistic, using an address space like this can help illustrate the general methodology employed to subnet an OSPF address space.

Only the address space for 2 of 512 areas is shown in . These areas are defined with the base address 150.100.2.0. Illustrating the entire address space for 150.100.0.0 would require hundreds of additional pages of addressing information. Each area would require the equivalent number ...