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From Rafael Weingärtner <>
Subject Re: CloudStack Advanced networking doubt
Date Tue, 28 Feb 2017 18:31:44 GMT
You mean, once a user allocates a VLAN’s (let’s say tag 1), in all of the
switches this VLAN tag is reserved?

On Tue, Feb 28, 2017 at 12:48 PM, Dag Sonstebo <>

> Hi Rafael,
> Keep in mind for an advanced zone the broadcast domain for VLANs is the
> zone rather than the POD, i.e. VMs in the new POD would use the same VLANs
> as the previous VMs in the original POD.
> Regards,
> Dag Sonstebo
> Cloud Architect
> ShapeBlue
> On 28/02/2017, 16:16, "Rafael Weingärtner" <>
> wrote:
>     Hi folks,
>     I was checking some information regarding ACS advanced networking
>     deployment mode, and I ran into this figure [1]. This made me wonder,
> what
>     would happen with the following scenario.
>     Let`s say I have a similar scenario as the one depicted in figure [1],
> a
>     set of pods with a set of clusters that have a set of hosts. Each host
> in a
>     pod is linked directly using a Layer-2 switch. Let’s assume there exist
>     network/aggregation layers that are configured properly and provide
> access
>     to VMs in the cloud using the public IP net. Let’s also assume that the
>     public IP net is; the management and storage networks are
> on
>     isolated networks and are properly set up (Assume also that we are
> using
>     the advanced networking mode).
>     Now, I create a guest network When I deploy a user VM,
> ACS will
>     deploy a VR (let’s call x) with an IP ( in the public net, and
>     other on the guest network ( Then, this VR(x) will execute the
>     firewalling/forwarding for my newly created user VM.
>     Let’s now imagine that I keep deploying user VMs to a point in which
> the
>     POD gets full. The next VM I create ACS will have to deploy in other
> PODs
>     of the environment. Because this new user VM will be in a different
> POD,
>     the communication with other user VMs is not straightforward anymore
> (not a
>     matter of using the same VLAN and net). What will ACS do to link users
> VMs
>     that are on the same virtual network, but deployed in different PODs?
>     Will it deploy other VR(y) with an IP (let's say on the new
>     and create a route between VR(x) and VR(y) using the public network, so
>     that the communication for VMs in network is transparent?
> administration/en/4.8/_images/network-setup-zone.png
>     --
>     Rafael Weingärtner
> 53 Chandos Place, Covent Garden, London  WC2N 4HSUK
> @shapeblue

Rafael Weingärtner

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