Well summarized blog. Whether it is route-domains or contexts all these came through over-time and those vendors had proprietary hardware with ASICs could not take virtualization to the extent of reserving hardware resources (CPU/Memory) per domain or context. Cisco today is in a unique position to support both route-domains (Single OS instance supporting multiple virtual management and data planes and give its customers the choice of hardware virtualization per tenant instance.

In my view this would be the right thing to do, so as to have all customer use-cases covered be it commercial, enterprise or Service provider environments.