In this post I’ll demonstrate how to build a simple OpenStack lab with OpenDaylight-managed virtual networking and integrate it with a Cisco IOS-XE data centre gateway using EVPN.
For the last 5 years OpenStack has been the training ground for a lot of emerging DC SDN solutions. OpenStack integration use case was one of the most compelling and easiest to implement thanks to the limited and suboptimal implementation of the native networking stack. Today, in 2017, features like L2 population, local ARP responder, L2 gateway integration, distributed routing and service function chaining have all become available in vanilla OpenStack and don’t require a proprietary SDN controller anymore. Admittedly, some of the features are still not (and may never be) implemented in the most optimal way (e.g. DVR). This is where new opensource SDN controllers, the likes of OVN and Dragonflow, step in to provide scalable, elegant and efficient implementation of these advanced networking features. However one major feature still remains outside of the scope of a lot of these new opensource SDN projects, and that is data centre gateway (DC-GW) integration. Let me start by explain why you would need this feature in the first place.
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