As far as I am aware you are in for an outage no matter how you do it. However 
I am very interested in the answer to this as I am going to have to do the same 
very soon to upgrade our network node.

Sent from my iPhone

On 12/09/2013, at 6:36 PM, Jitendra Kumar Bhaskar <jitendr...@pramati.com> 
wrote:

> Hi All,
> 
> Openstack setup is running on test environment with three nodes( 4 compute , 
> 1 network and 1 cloud). Every thing is working fine but I need to change 
> network node due to some hardware issue. Already more than 10 vms are 
> running. I am not getting any way ? So without interrupting of existing VM's 
> how can I replace network node ?
> 
> Regards
> Jitendra Bhaskar
> 
> 
> 
> 
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