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.

完整阅读

对于SR的微环避免，很多人不是特别清楚细节，所以我将在此简单总结下，希望对阅读此篇文章的人有所帮助，我会围绕以下几个话题展开讨论：

• 微环路是什么？微环避免能做什么？
• 微环避免跟TI-LFA有什么关系？
• 微环避免和TI-LFA同时存在的情况下，是否都会有作用？

为了方便大家理解，我将用一个topology来讨论我们今天涉及的所有内容，关于这部分更详细的内容，可以参阅SR卷一的9.10章节，以及SR卷二的8.11.1章节；另外此分析只作为问题验证说明，不能直接拿到现网使用，如40s的delay等，这些需要根据IGP的Scales以及硬件的收敛性能来做调整

完整阅读