SRv6头压缩技术方案研究

doi:10.11959/j.issn.1000-0801.2022282

Abstract

Abstract:

Digital and intelligent carrier network have become the priorities of network construction and operation.As a key technology to realize network interconnection and service carrying, carrier protocol critically decides the network scale and traffic efficiency.Facing the service consistent experience requirements, SRv6 as the most competitive technology of IPv6 evolution, has become the development direction in the future.Combined with the principle of SRv6 technology, the requirements of SRv6 compression were analyzed.Based on the main SRv6 compression schemes in the industry, the advantages and disadvantages of each scheme were analyzed, so as to provide guidance for the large scale deployment of SRv6 technology.

Key words: SRv6, header compression, carrier protocol

CLC Number:

TN919

Xia GONG, Huanan CHEN, Yongqing ZHU, Youming WU, Ke RUAN. Research on SRv6 header compression schemes[J]. Telecommunications Science, 2022, 38(12): 133-140.

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References 11

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隧道类型	封装开销字节/byte	典型字节长度（有效负荷）/byte
隧道类型	封装开销字节/byte	256	512	1 024	1 500
SRv6-TE（Encaps模式）	112	30.43%	17.95%	9.86%	6.95%
SRv6-TE（Insert模式）	72	21.95%	12.33%	6.57%	4.58%
SR-MPLS-TE	16	5.88%	3.03%	1.54%	1.06%

项目	G-SRv6	uSID	SRm6
SRv6/SRH兼容性	兼容	兼容	不兼容
地址规划	需要规划一致的Locator Block，前缀长度灵活	需要规划一致的 Locator Block，前缀长度灵活	与IP地址规划无关，可沿用已有IPv6地址规划
数据平面	兼容SRH，但需要在IPv6 DA中重新定义SI标志位	兼容SRH，不改变报文格式	新定义紧凑路由报头（compact routing header，CRH）携带压缩 SID；在基于段的服务指令（per-segment service instructions，PSSI）和基于路径的服务指令（per-path service instructions，PPSI）场景下，需要新增其他扩展报头
控制平面	需要基于SRv6控制平面进一步扩展相关协议，以通告节点支持G-SRv6 能力及继续压缩属性（continue of compression flavor， COC Flavor）等指令信息	需要基于 SRv6 控制平面，通告 uSID 指令信息（如uN/uA/uDT/uDX等）	SRm6 引入全新的协议扩展，通告 mSID及其与IPv6地址的映射关系
SID表项	需要为G-SID新增SID表项	需要为uSID新增SID表项	需要引入CRH-FIB表项存储mSID与IPv6地址映射关系
路由信息	基于SRv6 Locator路由，不新增路由信息	基于SRv6 Locator路由，不新增路由信息	基于IPv6路由表，不新增路由信息
功能扩展	只要地址规划符合压缩条件，支持所有类型SID压缩	支持 End、End.X、End.DT 系列和End.DX系列压缩	支持节点、邻接及绑定 SID 压缩功能， PSSI与PPSI功能可用于业务功能链（service function chain，SFC）及VPN场景
硬件实现	较容易，基于COC指示压缩SID并复制至DA相应字段	容易，通过移位操作即可实现	较复杂，需要查找本地 CRH 转发信息库（forwarding information base，FIB），将mSID映射为IPv6地址并复制到DA中

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Research on SRv6 header compression schemes

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