I have tried it with vlan mode.  It works fine.  Getting the metadata server to 
work is a little challenging, as it seems that syns that come in via one 
interface can't be acked through a different interface.  You might have to do 
some tricky routing to get it to work.  In my last deployment, i just went 
ahead and added nova-api to all of the compute hosts and set the api ip for 
metadata forwarding to 169.254.169.254 so metadata was retrieved from the 
localhost.  This worked fine.

Vish
On Sep 16, 2011, at 10:58 AM, Day, Phil wrote:

> HI Folks,
>  
> Looking through the code it looks as if all of the changes to support the 
> “multi_host” Network model have been made in the NetworkManager base class – 
> so although I’ve only seen a description of this being used in Flat networks 
> I wondered if anyone has tried it in VLAN mode (or knows of any gotchas that 
> would stop it working with VLANs) ?
>  
> Cheers,
> Phil
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