This case deals with service providers with modest expected growth in wireline markets.
These providers may have already reached, or may be close to reaching saturation in their market. As such, they may be tempted to streamline their addressing plans and reclaim enough IPv4 addresses to sustain their expected growth.
These providers, however, will still need to enable IPv6 in their network at some point in the future. But they may decide to delay making the necessary investments based on business goals; for example, synchronizing the deployment of IPv6 with their next equipment refresh cycle.
To know more about the tools that support this scenario download the paper:
Tools and Strategies for Coping With IPv4 Address Depletion
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