NetworkWorld has an interesting article describing how to control costs when implementing IPv6. The strategy is to slowly replace devices that do not support IPv6 as a part of the traditional equipment renewal plan, so the majors costs will be those of personel training.

You can significantly reduce IPv6 implementation expenses with a good implementation plan that spans a multi-year timeline. Typically, network equipment and software has a three to five year lifespan, and is depreciated accordingly. If you include IPv6 support as a part of your purchasing criteria as you upgrade network components, you minimize capital expenditures on IPv6.

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