5G承载网的“SRv6+EVPN”技术研究与规模部署

doi:10.11959/j.issn.1000-0801.2020253

Abstract

Abstract:

5G and cloud era has come,SRv6 and EVPN are the key technologies in the evolution of cloud network integration.The development process of network protocol was reviewed,the birth background,technical principles and advantages of SRv6 and EVPN were analyzed,and the application scenarios and deployment strategies of SRv6+EVPN were studied combined with the STN architecture of China Telecom 5G bearer network,China Telecom 5G development strategy and 2B service.Finally,the actual situation of China Telecom’s STN deployment of SRv6+EVPN was introduced,and the overall deployment of SRv6+EVPN technology in metropolitan + backbone cloud network integration infrastructure was forecasted.

Key words: STN, SRv6, EVPN, MPLS, VPLS

CLC Number:

TN915.41

Wei WU,Wenqiang ZHANG,Guangming YANG,Peiyong MA,Feng YANG. SRv6 +EVPN technology research and scale deployment of 5G bearer network[J]. Telecommunications Science, 2020, 36(8): 43-52.

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References 10

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对比项	SR-MPLS	SRv6
控制面	IPv4/IPv6	IPv6
数据面	MPLS	IPv6
转发性能	MPLS封装头小，以封装L3VPN为例，最少只要8 byte、2层MPLS标签，SR流量工程每增加1个SID，增加4 byte；转发效率高	以封装L3VPN为例，最少只要40 byte的IPv6头，SR流量工程每增加1个SID，增加16 byte
跨域部署	复杂，跨AS域只能使用SR-TE，需要依赖跨域控制器， PE需要远端PE的loopback主机路由	容易，跨域既有SRv6-BE也有SRv6-TE；利用IPv6可达性，跨AS域部署容易，不需要跨域扩散主机路由，引入汇聚路由即可，大幅减少了扩散路由数量和路由策略复杂度
大规模部署	复杂（SID空间有限，设备SID统一规划和维护复杂）	容易（SID采用IPv6地址空间，适合大网规划）
SR栈层数	3层标签：VPN/BGP/SR	1个IPv6报文头：统一业务标识和传输隧道
与传统网络互通	困难（IPv6 MPLS/BGP-LU）	容易（仅有IPv6）
控制和管理	支持SDN	支持SDN
可编程性	困难	灵活，业务编排器或各种App能够根据SLA及业务诉求指定网络和应用（业务链），提供灵活的可编程能力
可靠性	TI-LFA、SRv4-TE采用端到端保护技术，大规模组网BFD会话开销大	TI-LFA、SRv4-TE采用局部保护技术，无须部署复杂的E2E BFD检测技术
ECMP	复杂（插入entropy标签，有标签栈数量有限）	简单（基于flow label进行负载分组）
云网协同	困难，数据中心网络，包括VM，一般不支持MPLS协议	交易，数据中心网络设备一般都支持IPv6
终端协同	困难，终端设备支持MPLS困难	容易，终端设备一般都支持SRv6；Linux 4.10版本开始支持SRv6，4.14版本支持SRv6 Function 大部分功能

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SRv6 +EVPN technology research and scale deployment of 5G bearer network

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