Subject: Re: [nvo3] When is an overlay not a VPN?

From: Lizhong Jin <[email-masked]>
Date: Fri, 13 Apr 2012 23:16:45 +0800

Hi Adrian,
IMO, the difference of overlay and VPN is happened between boundary node
and customer node.
For VPN, usually we name boundary node as provider edge, and customer node
as customer edge which could be a switched device.
For overlay, we name boundary node as network virtualization edge, and
customer node as end-station which would be a VM or host that is connected
to NVE by physical or logical interface. The end-station should not be a
switched device, unless it is capable to be a tenant network.
Maybe we could say VPN is used to connect network, while overlay is used to
connect end-systems or end-system and network.

Thanks
Lizhong

>
>
>
> ---------- Forward ----------
> From: "Adrian Farrel" <[email-masked]>
> To: <[email-masked]>
> Cc:
> Date: Wed, 11 Apr 2012 16:44:04 +0100
> Subject: [nvo3] When is an overlay not a VPN?
> Hi,
>
> I am reviewing the nvo3 draft charter for the IESG telechat this week and I
> stumbled on the distinction between "overlay" and "VPN".
>
> Would someone like to risk two sentences of definition that allows me to
> see the
> difference?
>
> Thanks,
> Adrian
>
>
>
>