IPv6+智能骨干网络技术研究

doi:10.11959/j.issn.1000-0801.2023115

Abstract

Abstract:

The China Media Group backbone network is a key infrastructure that connects the headquarters, data centers, hubs/journalists at home and abroad, and “hundreds cities and thousands of screens” across the country, and IPv6+ is the main technical route of the next-generation IP network.The present situation and challenges of the backbone network of the headquarters were mainly analyzed, the principle, advantages and technical characteristics of the core of IPv6+ were introduced, and how IPv6+ technology adapts to the development of broadcast and television services was discussed.Finally, the conception and suggestion of constructing and deploying the next generation broadcast TV backbone network based on IPv6+ were put forward.It provided a new idea to simplify the protocol and speed up the service opening for the future construction of backbone network of radio and television stations.

Key words: backbone network, IPv6+, network slicing, iFIT, APN6, wide connection, ultra-broadband

CLC Number:

G220.7

Jianguo LIU, Hao QU, Hongming HUANG, Zhidan ZHU. Research on IPv6+ intelligent backbone network technology[J]. Telecommunications Science, 2023, 39(5): 155-166.

Figures/Tables 12

References 15

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约束参数	功能
优先级	指定不同隧道之间的优先顺序，高优先级隧道可以抢占低优先级隧道的带宽资源
带宽	带宽包括链路带宽与采集的实时流量带宽，使能实时流量带宽后，SDN 控制器会使用实时带宽进行路径计算，忽略隧道配置带宽
跳数限制	根据跳数约束算路
时延门限	算路选择路径时延在门限范围内的路径
显式路径	支持严格和松散模式，严格模式是指每一跳路径都指定，松散模式是指指定其中几个关键节点，其余路径按照网络配置自选

对比项	PIM	BIERv6	比较分析
控制机制	需要为每条流建立多播分发树，需要选择 RP、RPF 处理，共享树和源树切换	不需要建立多播分发树，不需要建立专门的P2MP隧道	传统多播技术为每条流建立多播分发树，当多播业务发展增多时，会导致树的数量急剧增大，资源占用多，运维困难
转发机制	PIM多播树复制转发	根据单播路由转发	与单播转发一致便于业务统一运维管理
可扩展性	需要中间节点保留多播流和树的状态，不利于扩展	中间节点只需要一份转发表即可	传统多播协议需每个转发点保留大量多播状态信息，导致：网络变化时，收敛慢；新用户加入时，时延大；用户体验差
可靠性	PIM MoFRR	双根1+1；单播FRR	BIERv6保护机制更简单，可靠性更高
用户体验	新用户加入需逐跳加入多播树，响应慢	新用户加入只需在 BFIR 和BFER间发请求即可	传统多播协议新用户加入请求要逐跳加入多播转发树中，导致用户观看初始延时大、体验差
设备能力要求	所有节点需保留多播树和多播流状态	报文携带 BitString，BitString占用部分业务带宽，芯片支持复制转发	传统多播协议对设备表项资源要求高；BIER转发对设备芯片复制能力要求高
跨域网络能力	分域分段部署 PIM，建多播分发树，E2E 设备要求支持PIM	BIERv6可通过IP可达来跨越不支持节点	BIERv6 由于其依据 IP 路由可达性，可以跨越不支持节点，便于穿越不支持设备或网络

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