[openstack-dev] [Nova][Neutron] Status of the nova-network to Neutron migration work

Jesse Pretorius jesse.pretorius at gmail.com
Mon Mar 30 11:49:40 UTC 2015

On 28 March 2015 at 00:41, Steve Wormley <openstack at wormley.com> wrote:

> So, I figured I'd weigh in on this as an employee of a nova-network using
> company.
> Nova-network allowed us to do a couple things simply.
> 1. Attach openstack networks to our existing VLANs using our existing
> firewall/gateway and allow easy access to hardware such as database servers
> and storage on the same VLAN.
> 2. Floating IPs managed at each compute node(multi-host) and via the
> standard nova API calls.
> 3. Access to our instances via their private IP addresses from inside the
> company(see 1)
> Our forklift replacement to neutron(as we know we can't 'migrate') is at
> the following state.
> 2 meant we can't use pure provider VLAN networks so we had to wait for DVR
> VLAN support to work.

I'm always confused when I see operators mention that provider VLANs can't
be used in a Neutron configuration. While at my former employer we had that
setup with Grizzly, and also note that any instance attached to a VLAN
tagged tenant network did not go via the L3 agent... the traffic was tagged
and sent directly from the compute node onto the VLAN.

All we had to do to make this work was to allow VLAN tagged networks and
the cloud admin had to setup the provider network with the appropriate VLAN
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