ICS 33.040.40 CCS L78 YD 中华人民共和国 通信行业标准 YD/T XXXXX—XXXX 代替YD/T 1341-2005 IPv6基本协议 IPv6协议 Internet protocol version 6 (IPv6) specification （报批稿） 20XX - XX - XX发布 20XX - XX - XX实施 中华人民共和国工业和信息化部发布 1目  次 前 言 ............................................................................................................................................................... 2 1 范围 ................................................................................................................................................................... 3 2 规范性引用文件 ............................................................................................................................................... 3 3 术语、定义和缩略语 ....................................................................................................................................... 3 3.1 术语和定义 ................................................................................................................................................ 3 3.2 缩略语 ........................................................................................................................................................ 4 4 概述 ................................................................................................................................................................... 5 5 IPv6头格式 ........................................................................................................................................................ 5 6 IPv6扩展头 ........................................................................................................................................................ 6 6.1 扩展头序列 ................................................................................................................................................ 7 6.2 选项 ............................................................................................................................................................ 7 6.3 逐跳选项头 ................................................................................................................................................ 9 6.4 路由头 ........................................................................................................................................................ 9 6.5 分片 .......................................................................................................................................................... 10 6.6 目的选项头 .............................................................................................................................................. 12 6.7 无下一个头 .............................................................................................................................................. 13 6.8 定义新的扩展头和选项 .......................................................................................................................... 13 7 IPv6数据包长度 .............................................................................................................................................. 13 8 流标签 ............................................................................................................................................................. 14 9 业务等级 ......................................................................................................................................................... 14 10 上层协议 ....................................................................................................................................................... 14 10.1 上层协议校验和 .................................................................................................................................... 14 10.2 数据包最大生存时间 ............................................................................................................................ 15 10.3 最大上层载荷 长度 ...............................