面向新型城域网的UMR技术方案研究与应用

doi:10.11959/j.issn.1000-0801.2022028

Abstract

Abstract:

The new metropolitan area network adopts the new architecture of spine-leaf.BRAS is a high hanging and centralized deployment mode.With the deployment of the new metropolitan area network, the home wide service is gradually cut over to the new network.The current typical bearer scheme has many problems, such as the sharp increase of pressure on the network equipment MAC routing table, the large and complex network configuration.After analyzing and comparing the defects of typical bearer schemes, the implementation scheme of UMR technology was innovatively put forward, which provided reference significance for promoting the rapid deployment of new metropolitan area network.

Key words: cloud network integration, new metropolitan area network, flexible adjustment, fixed mobile bearing, SRv6

CLC Number:

TP915.06

Yuanyang YIN, Zhizhong WANG, Youqiang JIANG, Jiaqi SUN, Xiaobin LIANG. Research and application of UMR technology for new metropolitan area network[J]. Telecommunications Science, 2022, 38(2): 149-156.

Figures/Tables 8

故障点	故障后上行流行为	故障后下行流行为	故障切换	故障恢复
故障点1	OLT/SW→A-leaf2→spine1＆2→S-leaf1＆2→pUP1	pUP1→S-leaf1＆2→spine1＆2→A-leaf2→OLT/SW	上行：OLT的Eth-Trunk成员口故障会后毫秒级切换	OLT的Eth-Trunk成员口恢复后，毫秒级回切
故障点2	同上	同上	上行：OLT的Eth-Trunk成员口故障会后毫秒级切换下行：在spine上触发SRv6节点保护，毫秒级切换	A-leaf1 恢复后，流量负载分担到 A-leaf1 和A-leaf2，毫秒级回切
故障点3	OLT/SW→A-leaf1＆2→spine1＆2→S-leaf1＆2→pUP1	pUP1→S-leaf1＆2→spine1＆2→A-leaf1＆2→OLT/SW	链路故障触发 Ti-LFA 切换，上下行流毫秒级切换	故障链路恢复后，流量负载分担，毫秒级回切
故障点4	OLT/SW→A-leaf1＆2→spine2→S-leaf1＆2→pUP1	pUP1→S-leaf1＆2→spine2→A-leaf1＆2→OLT/SW	同上	故障节点恢复后，流量负载分担，毫秒级回切
故障点5	OLT/SW→A-leaf1＆2→spine1＆2→S-leaf1＆2→pUP1	pUP1→S-leaf1＆2→spine1＆2→A-leaf1＆2→OLT/SW	同上	故障链路恢复后，流量负载分担，毫秒级回切
故障点6	OLT/SW→A-leaf1＆2→spine1＆2→S-leaf2→pUP1	pUP1→S-leaf2→spine1＆2→A-leaf1＆2→OLT/SW	上行：在spine触发节点保护，毫秒级切换	故障节点恢复后，流量负载分担，毫秒级回切
			下行：相当于 UP 的 EthTrunk成员口故障，毫秒级切换
故障点7	OLT/SW→A-leaf1＆2→spine1＆2→S-leaf2→pUP1	pUP1→S-leaf2→spine1＆2→A-leaf1＆2→OLT/SW	上行：故障瞬间通过 bypass保护，丢包毫秒切换	UP 的 Eth-Trunk 成员口恢复后，毫秒级回切
			下行：相当于 UP 的 EthTrunk成员口故障，毫秒级切换
故障点8＆9	假设pUP3为备：OLT/SW→A-leaf1＆2→spine1＆2→S-leaf1＆2→pUP3	pUP3→S-leaf1＆2→spine1＆2→A-leaf1＆2→OLT/SW	根据UP池备份模式切换	根据UP池备份模式切换

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区别	EVPN VPLS 方案	EVPN VPWS 方案
业务部署	OLT接入A-leaf的VSI，A-leaf、S-leaf需要学习用户 MAC，同一台OLT的不同S-VLAN可以共享同一个VSI实例	OLT接入A-leaf的EVPN VPWS实例，A-leaf、S-leaf不学习用户 MAC，每个 S-VLAN 部署一条 EVPN VPWS业务
广播域及安全性	（1）广播，多点到多点方式	（1）非广播，点到点方式
	（2）针对广播导致的安全风险可以通过 BGP EVPN MACflapping和MAC抑制、AC口隔离、E-Tree等技术解决。	（2）本身无广播机制，无广播导致的安全问题
RR反射	每台A-leaf和S-leaf发布的MAC路由给RR，由RR进行MAC路由的反射扩散	A-leaf 和 S-leaf 不学 MAC，RR 只需要反射 EVPN VPWS路由
负载分担	可支持N:1或(N+1):1	可支持1:1或1+1或N:1
部署和运维复杂度	部署简单，对网络运维能力要求高，容易引起网络环路及风暴	部署配置量多，相对复杂，不利于业务快速开通，对网络的运维能力要求相对较低

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Research and application of UMR technology for new metropolitan area network

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