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标签为 ‘L2VPN’的文章

Replaced mLACP and NV Cluster by EVPN + Anycast IRB on NCS5500/Fretta

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Introduction

There are two old great features that can achieve Active/Active in multi-chassis:

  • mLACP: ASR9k support, and by ICCP.
  • NV Cluster: only ASR9k support, not need other protocol (e.g ICCP), but not support from 6.x.

So could we have the similar solution on NCS55xx? The answer is “Yes”, we can deploy EVPN + Anycast IRB to achieve the similar function. For this article, no reference to real EVPN environment, only use multi-home A/A EVPN function. And include testing when link failure.

Conclusion

  • If you deploy EVPN + Any IRB, you must to know there are no dynamic IGP protocol between CE/mPE or Host/mPE, only Static or default GW. That due to we couldn’t deploy the same IGP process at two chassis. That should different with NV Cluster. As follow:
  • Due to deploy EVPN that belong to BGP, so we need underlay protocol that can be achieved by LDP or Segment Routing. In this example, will deploy Segment Routing.
  • Traffic(via EVPN) will not forward to the link between two PEs, so no need to deploy inter-link. Except customer has other L3 business in the same PEs.
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EVPN Summary

+1

EVPN

L2VPN中,我们常见的是VPLS,EoMPLS,AoTM等,这些技术主要利用伪线技术(Kompella/Martini)构造虚拟专网或专线,并由MPLS承载。虽然已经可以通过BGP自动发现并创建伪线,但基于伪线技术的L2VPN有很多缺陷,所以需要一个技术可以通过BGP来替代原来的伪线技术,因此才有了EVPN,EVPN带来最大的不同就是通过BGP控制平面来进行MAC学习,而不是数据平面。2015年提出的PBB-EVPN也是属于EVPN的一种。

EVPN带着替换伪线技术的使命而来,同之前一样,主要涉及点到点、点到多点,下图包含了我们常见的几种EVPN(我暂时没有把ETREE列出来),此篇文章主要以几类Route Type为例,展开整理EVPN的内容,以备以后复习

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Type4:Ethernet Segment Route

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Type4 能做什么?

Type4的主要作用就是Redundancy Group的自动发现,以及在Multi-Homing中DF(Designated Forwarder)的选举;另外Type4是全局的,在PE上,对于同一个CE,Type4是相同的,只有EVI是不同的

Type4 分析

报文格式

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Type3:Inclusive Multicast Route

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Type3能做什么

对于分析Type3,同样用上一篇文章中的报文 “evpn_pacp_rt1-4.zip”,主要用于传递广播 Broadcast,组播 Multicast接为未知单播 Unknown Unicast,通常用BUM代指

Type3 分析

报文格式

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Type2:MAC/IP Advertisement Route

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Type2 能做什么?

对于分析Type2,用上一篇文章中的报文 “evpn_pacp_rt1-4.zip”,由于type2主要承载MAC地址,所以不涉及控制层面的内容

  • 主要传递MAC地址
  • 在Type2中的Community中定义了MAC迁移

完整阅读

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