Anycast　is　a　new　communication　model　defined　in　IPv6.　But　due　to　the　problems　facing　any　cast　and　the　limited　deployment　of　IPv6　in　the　Internet,　currently　few　implementations　exist　and　even　fewer　have　been　tested　outside　simulators.　OSPF　is　a　popular　intra-AS　routing　protocol　successful　in　practice　but　do　not　support　anycast,　the　IPv6　version　of　which　is　OSPFvS.　Therefore,　we　propose　AOSPF　(Anycast　Extensions　to　OSPFvS)　routing　protocol　extending　OSPFvS　to　support　anycast,　after　analyzing　the　similarity　and　difference　between　anycast　and　unicast.　We　also　implement　AOSPF　and　test　it　successfully　in　our　IPv6　test　bed.　And　the　performance　analysis　shows　the　overhead　of　AOSPF　is　low.　©　2005　IEEE.