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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