RFC 4291:IP Version 6 Addressing Architecture
RFC-Ref

aggregation


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... high-order bits (e.g., due to multiple high-order prefixes associated with different aggregations) will map to the same Solicited-Node address ...


... Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy", RFC 1519(-> 4632), September 1993. ...



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