Open Stack

Le 08/07/2015 18:35, Gustavo Randich a écrit :
> Hi,
>
> We are trying to figure out how to transition from a network model 
> using nova-network and a single VLAN to a model using Neutron and 
> multiple VXLAN tunnels.
>
> The main issue is not how to configure and setup the tunnels, but how 
> to expose the new virtual machines born inside the tunnels to our 
> "legacy", non-VXLAN, non-Openstack networks, i.e. DNS serrvers, 
> databases, hardware load balancers, monitoring/metrics servers, etc.

What I understand from Neutron use of VXLAN/GRE, is that it's only for 
encapsulating L2 traffic into L3 from tenant/project to networking 
node(s). It permits to bypass the L2 configuration (i.e. switches) that 
exists between your servers.

See: 
http://docs.openstack.org/networking-guide/_images/scenario-legacy-ovs-flowns1.png

The decision to route the packet is made by the qrouter/L3 agent on the 
networking node(s).
Eventually you can create a L2 only network inside Neutron and assign a 
gateway that is a physical device outside your servers.

See: http://docs.openstack.org/networking-guide/deploy_scenario4a.html

I'm also currently on the task to migrate a full nova-network VLAN 
network to a Neutron VLAN topology for fixed IPs and VXLAN/GRE topology 
for floating IPs.

Hope Neutron specialists are around :)

See you,

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