基于IPv4公有地址耗尽的背景，从运营商IP城域网现状出发，聚焦运营商向IPv6演进的关注点，并对IP城域网向IPv6演进的主流方案进行了说明和比较。在此基础上对IP城域网向IPv6迁移路线进行了探讨，并给出不同架构IP城域网的演进策略建议。%Based on the background of IPv4 public address exhaustion, it analyzes and compares three technology solutions in IP MAN, probes the different transition routes form IPv4 to IPv6, and tries to provide the suggestions on IPv6 evolution strategy in IP MAN with the different architecture.
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