Hey! Thanks for writing this up! It looks like a really nice guide and totally gonna be useful. And I totally will be recommending it for read in case of questions regarding such migration. I have some questions though regarding the process and setup you're testing against. It's not that you need to answer all of them, but wondering about also direction you are going as a whole. 1. Do you have network nodes on the same hosts as computes, controllers or standalone ones? This one does not seem to cover L3 migration yet, and I assume it will be described in the next article in series? 2. It seems that your approach is to rollout changes to OVN across all compute nodes at once, and then reboot VMs, but then you see an unexpected behavior regarding DHCP/Metadata/etc. I was wondering if you've tried to run the playbook with a `--limit` to convert per-compute basis? And then live migrate instances between computes, to allow them to be re-wired? At least I've heard about this approach during one of Summit sessions hold by CERN. But then I'm having the same concerns about how to migrate L3 and FIPs... 3. I was wondering if you played with neutron-ovn-db-sync-util [1] to migrate the state and populate OVN NB/SB databases? [1] https://docs.openstack.org/openstack-ansible-os_neutron/latest/app-ovn.html#... On Fri, 14 Nov 2025, 15:02 Gk Gk, <ygk.kmr@gmail.com> wrote:
Hi Folks,
I thought of sharing the below post detailing my learnings during the neutron plugin migration from LXB to OVN. Please check this out if anyone is interested.
https://medium.com/@ygk.kmr/openstack-neutron-migration-from-linux-bridge-to...
Thoughts, comments, opinions are welcome including criticism..
Thanks Kumar