[openstack-dev] VLANs working with Subnets

Jay Pipes jaypipes at gmail.com
Fri Nov 9 16:01:38 UTC 2012

Hi Girish, please see this excellent article from Piotr at Mirantis for
a discussion on the VLAN manager:


The followup article:


Is also extremely useful for understanding tenant isolation on the
networks and the flow of data between tenants and the network controller(s).


On 10/31/2012 04:08 PM, girish kumar wrote:
> Hi All,
> I am installing openstack folsom with tenant networks being VLAN based.
> In such cases, I would like to understand how the isolation will happen
> between VMs of different subnets. Will the packets sent from one VM of
> one subnet directly go to VMs of others subnet(because of same VLAN tag)
> with out intervention of router in between.
> All these subnets corresponds to single tenant network, so the VLAN id
> for these VMs will be same.
> Please clarify. Your clarifications are very much appreciated.
> -- 
> With Best Regards,
> Girish
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