Hi, I don't know what libvirt OVN hook is though. Do you have a link?
This suggests that `requested-chassis` for the OVN port is, at least for a moment, set to `null`, while both hosts have the interface with `iface-id` set to the port ID. Your hook should avoid it. (Always have requested-chassis pointing to one host or another, but never clear it up completely.) (Alternatively, create the destination OVS interface only when migration is complete.) BTW the 100 flapping in 50s is actually not too bad, it was a lot worse before: https://github.com/ovn-org/ovn/commit/4dc4bc7fdb848bcc626becbd2c80ffef8a39ff9a --- A while ago, I wrote a blog walking through the binding process for OVN, (it covers live migration and port binding flapping; it also covers the additional-requested-chassis feature that is helpful for live migration, but I suspect you don't use it). I hope it may be of help: https://ihar.dev/posts/ovn-chassis-binding-walkthru On Fri, Jul 26, 2024 at 9:41 AM Brendan Doyle via discuss < ovs-discuss@openvswitch.org> wrote: > Hi Folks, > > > We have a pair of VM's with their network interfaces connected into OVN > via the libvert > OVN hook. When doing live migration of these I see intense port flapping, > with each > chassis repeatably claiming the interfaces and and configuring them into > the southbound > DB/OVS, bringing the ports up/down constantly. I see the sequence of > events below > repeated up to a 100 times in a 50s period as the interfaces are migrated > from one chassis > to another. > > Is this expected behavior, and what is the expected interface outage to > be during this > period? We have a heartbeat running with a 30s timeout, and that > intermittently > fails during these migrations. > > On each chassis I see these sequence of events repeated 90 to 100 times: > > > in pcacn001, we see: 2024-07-21T09:36:35.262Z|304798|binding|INFO|Changing > chassis for lport c7e2c10e-43f1-11ef-b3c5-a8698c171668 from pcacn004 to > pcacn001 > 2024-07-21T09:36:35.262Z|304799|binding|INFO|c7e2c10e-43f1-11ef-b3c5-a8698c171668: > Claiming 00:13:97:f3:ea:30 11.11.1.2 > 2024-07-21T09:36:35.265Z|304800|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:36:35.583Z|304806|binding|INFO|Removing lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.584Z|304809|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.746Z|304810|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:36:35.891Z|304811|binding|INFO|Changing chassis for lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 from pcacn004 to pcacn001 > 2024-07-21T09:36:35.891Z|304812|binding|INFO|c7e2c10e-43f1-11ef-b3c5-a8698c171668: > Claiming 00:13:97:f3:ea:30 11.11.1.2 > 2024-07-21T09:36:35.967Z|304813|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:36:36.189Z|304817|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:36:36.338Z|304818|binding|INFO|Removing lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:36.338Z|304818|binding|INFO|Removing lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:36.339Z|304819|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 down in Southbound > 2024-07-21T09:36:36.422Z|304821|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:36.422Z|304822|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound And this moving the > port from pcacn004 to pcacn001 and setting the port down/up repeats for > 90-100 times until: 2024-07-21T09:37:23.945Z|306386|binding|INFO|Releasing > lport c7e2c10e-43f1-11ef-b3c5-a8698c171668 from this chassis. 49 seconds of > this. But also in pcacn004, we see it doing the same: > 2024-07-21T09:36:35.253Z|301841|binding|INFO|Changing chassis for lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 from pcacn001 to pcacn004. > 2024-07-21T09:36:35.253Z|301842|binding|INFO|c7e2c10e-43f1-11ef-b3c5-a8698c171668: > Claiming 00:13:97:f3:ea:30 11.11.1.2 > 2024-07-21T09:36:35.259Z|301843|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 down in Southbound > 2024-07-21T09:36:35.452Z|301846|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.483Z|301850|binding|INFO|Removing lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.483Z|301851|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 down in Southbound > 2024-07-21T09:36:35.562Z|301852|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.562Z|301853|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:36:35.743Z|301855|binding|INFO|Removing lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.743Z|301856|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 down in Southbound > 2024-07-21T09:36:35.817Z|301857|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 ovn-installed in OVS > 2024-07-21T09:36:35.817Z|301858|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound which continues until > it finally gets the port at: > 2024-07-21T09:37:23.793Z|303182|binding|INFO|Changing chassis for lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 from pcacn001 to pcacn004. > 2024-07-21T09:37:23.793Z|303183|binding|INFO|c7e2c10e-43f1-11ef-b3c5-a8698c171668: > Claiming 00:13:97:f3:ea:30 11.11.1.2 > 2024-07-21T09:37:23.857Z|303184|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > 2024-07-21T09:37:23.949Z|303185|binding|INFO|Claiming lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 for this chassis. > 2024-07-21T09:37:23.949Z|303186|binding|INFO|c7e2c10e-43f1-11ef-b3c5-a8698c171668: > Claiming 00:13:97:f3:ea:30 11.11.1.2 > 2024-07-21T09:37:23.951Z|303187|binding|INFO|Setting lport > c7e2c10e-43f1-11ef-b3c5-a8698c171668 up in Southbound > _______________________________________________ > discuss mailing list > disc...@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss >
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