A team of us at Cisco has been working, together with industry colleagues, on defining and standardizing a new Layer 2 VPN solution known as Ethernet Virtual Private Network or E-VPN. In this post, I will discuss the key requirements that helped shape this solution, and attempt to shed some light on the drivers for the technology and how it enables the evolution of Service Provider L2VPN offerings. Read More »
The networking industry has recently developed a renewed interest in virtual overlays, often wrapped in an “SDN as the controller” context. Amidst the promise, the hope and the hype, the following questions present themselves:
- What exactly is an overlay?
- What distinguishes an overlay from a VPN?
- How decoupled can an overlay be from the underlay network and what are the tradeoffs?
- What are the advantages of overlays and will they emerge as the new networking world order? Read More »