The typical use case is to support subnet emulation, e.g., a group of links 
over which broadcast is emulated as with LANE. 

> On Aug 12, 2016, at 7:11 PM, David Allan I <[email protected]> wrote:
> 
> My point would be that introducing  additional complexity in an overlay 
> should have a use case associate with it. It would not be something you would 
> do gratuitously….
>  
> SO I’m looking for the draft to provide a use case for this vs. simply 
> mentioning  subnetting without any context J 
>  
> Cheers
> Dave
>  
> From: nvo3 [mailto:[email protected]] On Behalf Of Joe Touch
> Sent: Friday, August 12, 2016 5:07 PM
> To: David Allan I <[email protected]>; [email protected]; Bocci, Matthew 
> (Nokia - GB) <[email protected]>
> Subject: Re: [nvo3] FW: Call for interest on NVO3 use case draft
>  
>  
> 
>  
> On 8/12/2016 4:16 PM, David Allan I wrote:
> 4.2 Why I would subnet my overlay could use some explanation. I normally 
> think of subnetting as a  convenient address summarization technique 
> dependent on topology, and with an overlay I don’t have a topology.
> 
> The topology of an overlay is determined by its tunnels, just as the topology 
> of the underlying net is determined by its links.
> 
> A subnet in an overlay corresponds either to a single multipoint tunnel or to 
> a set of tunnels that transparently acts as such - just as a subnet in the 
> Internet base network corresponds to a shared access link or a set of links 
> that transparently act as such (e.g., switched ethernet).
> 
> Joe
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