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We have fixed this issue. It appears that configurations linked through plugin.ini aren’t read by neutron when neutron-api runs through Apache. As a result, the new router
was set as using a local network instead of GRE tunneling. In our case, moving the configurations to regular neutron.conf fixed the issue.

Jean-Philippe Méthot
Senior Openstack system administrator
Administrateur système Openstack sénior
PlanetHoster inc.
4414-4416 Louis B Mayer
Laval, QC, H7P 0G1, Canada
TEL : +1.514.802.1644 - Poste : 2644
FAX : +1.514.612.0678
CA/US : 1.855.774.4678
FR : 01 76 60 41 43
UK : 0808 189 0423






> Le 18 nov. 2020 à 14:03, Jean-Philippe Méthot <jp.methot at planethoster.info> a écrit :
> 
> Hi,
> 
> We’ve been running an Openstack setup in production for several years and we upgraded it to Rocky last May. We are now creating a router for a new project for the first time
> since that upgrade and we’ve been running into issues with L3HA for that router. Essentially, the router for this project gets initialized with a faulty HA network. 
> 
> How do I know it’s faulty?
> 
> -Both Keepalived instances think they are master.
> -Both HA network ports get the wrong MTU (9000 instead of 8958)
> -Even if I manually set the proper MTU, VRRP packets don’t get received on the other node
> -If I then disable and enable the router, MTU gets rolled back to 9000
> -If I force the MTU for this port through the neutron database, it will also get rolled back to 9000 once the router gets recreated
> 
> This setup is using openvswitch and GRE tunnels. I have 7 other projects with L3HA routers running and they do not have this issue, even if I create new routers in them. They are also older projects created before the upgrade to Rocky. This problem is strictly isolated to this new project.
> 
> I’m not sure exactly what’s going on here and why Openstack isn’t taking encapsulation into account when automatically setting its HA network MTU for this. Any suggestion on how to figure out what’s happening behind the scene?
> 
> Jean-Philippe Méthot
> Senior Openstack system administrator
> Administrateur système Openstack sénior
> PlanetHoster inc.
> 4414-4416 Louis B Mayer
> Laval, QC, H7P 0G1, Canada
> TEL : +1.514.802.1644 - Poste : 2644
> FAX : +1.514.612.0678
> CA/US : 1.855.774.4678
> FR : 01 76 60 41 43
> UK : 0808 189 0423
> 
> 
> 
> 
> 
> 

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