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I tested this on my own DVR test environment with a random static route 
and I'm getting the same results as on production. Here's what I get in 
the logs :

2022-05-09 17:28:50.018 691 INFO neutron.agent.l3.agent [-] Starting 
processing update 41fcd10b-7db5-45d9-b23c-e22f34c45eec, action 3, 
priority 1, update_id 9e112de1-f538-4a41-9526-152aa3937129. Wait time 
elapsed: 0.001
2022-05-09 17:28:50.019 691 INFO neutron.agent.l3.agent [-] Starting 
router update for 41fcd10b-7db5-45d9-b23c-e22f34c45eec, action 3, 
priority 1, update_id 9e112de1-f538-4a41-9526-152aa3937129. Wait time 
elapsed: 0.002
2022-05-09 17:28:51.640 691 INFO neutron.agent.l3.agent [-] Finished a 
router update for 41fcd10b-7db5-45d9-b23c-e22f34c45eec, update_id 
9e112de1-f538-4a41-9526-152aa3937129. Time elapsed: 1.622

As you can see, there was an attempt at updating the router and it did 
return as successful. However, there was no new route added in the 
router or floating ip namespace. No error either.

On 5/6/22 14:40, Slawek Kaplonski wrote:
> Hi,
>
> W dniu pią, 6 maj 2022 o 14:14:47 -0400 użytkownik J-P Methot 
> <jp.methot at planethoster.info> napisał:
>>
>> Hi,
>>
>> We're in this situation where we are going to move some instances 
>> from one openstack cluster to another. After this process, we want 
>> our instances on the new openstack cluster to keep the same floating 
>> IPs but also to be able to communicate with some instances that are 
>> in the same public IP range on the first cluster.
>>
>> To accomplish this, we want to add static routes like 'X.X.X.X/32 via 
>> Y.Y.Y.Y'. However, we're using DVR and when we add the static routes, 
>> they do not show up anywhere in any of the namespaces. Is there a 
>> different way to add static routes on DVR instead of using openstack 
>> router add route ?
>>
> No, there is no other way to add static routes to the dvr router. I 
> don't have any DVR deployment now to check it but IIRC route should be 
> added in the qrouter namespace in the compute nodes where router 
> exists. If it's not there please check logs of the l3-agent on those 
> hosts, maybe there are some errors there.
>> -- 
>> Jean-Philippe Méthot
>> Senior Openstack system administrator
>> Administrateur système Openstack sénior
>> PlanetHoster inc.
> -- 
> Slawek Kaplonski
> Principal Software Engineer
> Red Hat

-- 
Jean-Philippe Méthot
Senior Openstack system administrator
Administrateur système Openstack sénior
PlanetHoster inc.
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