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HI Jeremy, 

I would personally look into neutron and consider provider network. ML2 allows different type of backends, and between nodes I would use GRE.

Just my 2 cents. I know I was short but at least you got some ideas on where to look for. 

Remo 
 
On May 30, 2014, at 1:21 PM, Jeremy Utley <jerutley at gmail.com> wrote:

> Hello list,
> 
> I'm working on a proof-of-concept openstack installation for my company, and am looking for the answers to some questions that I haven't been able to find the answer to.  Hopefully someone here can help point me in the right direction!
> 
> I've got a basic setup already in place - 2 controller nodes, 3 compute nodes (with 5 more ready to provision when we line everything out).  The main problems I'm facing right now is in the networking.  We need to integrate this openstack setup with the network resources already in place in our setup, and I'm not exactly sure how to do so.  I'll start off with basically going over how we are currently setup.
> 
> 1. Management and compute nodes are all connected via infiniband networking, we are using this as our cluster management network (10.30.x.x/16).  This network has zero connectivity to anything else - it's completely private for the cluster.
> 
> 2. eth2 on all compute nodes are connected to each other via a vlan on our switch, and bridged to br100 to be our openstack fixed network. (10.18.x.x/16).
> 
> 3. eth1 on all compute nodes is connected up to our existing colo private network.  We are currently defining this as our external network.  (10.5.20.0/22) - In our current setup (with nova-network and the FlatDHCPManager), I have taken a block of IP's from this subnet and reserved them for use as floating IP's for testing purposes - this is working perfectly right now.
> 
> 4. eth0 on all compute nodes is connected to our existing colo public network.  We have a /19 public allocation, broken up into numerous /24 and /25 segments to keep independent divisions of the company fully segregated - each segment is a separate vlan on the public network switches.  In what we currently have setup, we are not utilizing this.
> 
> Ultimately, we'd like to have our cluster VM's connected to the fixed network (on eth2), and treat both eth1 and eth0 as "public networks" we can use floating IP's from.  All VM's should connect to eth1 and be able to have floating IP's assigned from that network to them, and they should be able to connect to a single tagged vlan on eth0 as well.
> 
> From the reading I've done so far, I think what we are trying to do might be too complicated for nova-network, since it depends on defining a single interface as the public interface on the compute nodes, and we might potentially have more.  Am I interpreting that correctly, or could we maybe accomplish this with nova-network (perhaps using the VLANManager mode?)
> 
> If we have to switch to Neutron, can you run the neutron services on each compute node?  We have concerns about scale if we have to implement a separate network node, as we could easily end up saturating a full gig-e interface with this cluster in the future.  Plus, the extra cost expenditure of dedicated network nodes could end up cost-prohibitive in the early stages of deployment.
> 
> Anyone got any suggestions for us?
> 
> Thank you for your time,
> 
> Jeremy Utley
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