Hello: Can you fill a LP bug https://bugs.launchpad.net/neutron? It could be useful if you also provide the SR-IOV port `Logical_Switch_Port` register and the associated `HA_Chassis_Group`. What version of OVN and Neutron (OpenStack in general) are you using? Regards. On Thu, Jan 29, 2026 at 2:56 PM engineer2024 <engineerlinux2024@gmail.com> wrote:
HI,
I am trying to setup an extport host to act as host for an sriov vm IP. Set it up using
ovs-vsctl set Open_vSwitch . external_ids:ovn-cms-options=enable-chassis-as-extport-host
But when a vm is created with this sriov port, it is not able to reach the metadata service at 169.254.169.254. Inside the vm
vm:~# ip r 10.1.0.0/24 dev ens5 proto kernel scope link src 10.1.0.20 169.254.169.254 via 10.1.0.12 dev ens5 proto dhcp src 10.36.160.60 metric 100
On the node marked as the extport host for this vm's ip, its ovn-controller log shows
--------- 2026-01-29T11:52:26.922Z|00069|binding|INFO|Setting lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf up in Southbound 2026-01-29T11:52:27.849Z|00070|binding|INFO|Releasing lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf from this chassis (sb_readonly=0) 2026-01-29T11:52:27.851Z|00071|binding|INFO|Setting lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf down in Southbound 2026-01-29T11:52:28.480Z|00072|binding|INFO|Claiming lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf for this chassis. 2026-01-29T11:52:28.480Z|00073|binding|INFO|a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf: Claiming fa:16:3e:f3:82:f9 10.1.0.20 2026-01-29T11:52:28.482Z|00074|binding|INFO|Setting lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf up in Southbound 2026-01-29T11:52:29.486Z|00075|binding|INFO|Releasing lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf from this chassis (sb_readonly=0) 2026-01-29T11:52:29.489Z|00076|binding|INFO|Setting lport a7c94e2b-58f1-4a6d-8c73-1d0e6f92b4cf down in Southbound ------------ It is fluctuating intermittently and not stable. Why is this flapping ? Also the metadata proxy is running fine on the extport host
ip netns exec ovnmeta-7d9a4c21-1e6f-4f2b-9a84-3c8e1b7d62f0 telnet 169.254.169.254 80 Trying 169.254.169.254... Connected to 169.254.169.254.
# ip netns exec ovnmeta-7d9a4c21-1e6f-4f2b-9a84-3c8e1b7d62f0 ss -ln | grep 80 tcp LISTEN 0 1024 169.254.169.254:80 <http://169.254.169.254/> 0.0.0.0:*
# ps -ef | grep ovn-meta root 408634 1 9 11:52 ? 00:02:45 neutron-ovn-metadata-agent (/openstack/venvs/neutron-29.2.3/bin/python3 /openstack/venvs/neutron-29.2.3/bin/neutron-ovn-metadata-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini --config-file /etc/neutron/neutron_ovn_metadata_agent.ini) root 408673 1 0 11:52 ? 00:00:00 haproxy -f /var/lib/neutron/ovn-metadata-proxy/7d9a4c21-1e6f-4f2b-9a84-3c8e1b7d62f0.conf root 421770 388277 0 12:21 pts/12 00:00:00 grep --color=auto ovn-meta