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Thanks slawek,

Actually, we dig a little bit into code:
https://review.opendev.org/c/openstack/neutron/+/64553

In patchet 59, a discussion between Carl and Assaf seems to be the
decision of having 3:
- "An additional standby could help certain topologies though I'm sure."
- "Fair enough"

Cheers,

On 21.10.21 - 08:49, Slawek Kaplonski wrote:
> Hi,
> 
> On Thu, Oct 21, 2021 at 07:34:43AM +0200, Arnaud wrote:
> > Sorry, forgot to add neutron header
> > 
> > Kind regards,
> > Arnaud
> > 
> > Le 20 octobre 2021 17:28:39 GMT+02:00, Arnaud Morin <arnaud.morin at gmail.com> a écrit :
> > >Hey team,
> > >
> > >When using DVR + HA, we endup with all routers beeing deployed on the
> > >computes (the DVR part) and 3 routers on dvr_snat nodes (for HA).
> > >
> > >The question is why 3 for snats?
> > >I know that this is the max_l3_agents_per_router config parameter, but
> > >2 seems enough?
> > >
> > >On the other side, DHCP agent default (dhcp_agents_per_network) is 1,
> > >while this is also a precious service provided in the tenant network.
> > >
> > >So, is there any downside on having only 2 agents for routers?
> 
> TBH I don't think there is any downside to have only 2 agents hosting each
> router (SNAT in case of DVR). Actually this is what we are e.g. testing in the
> neutron-ovs-tempest-dvr-ha-multinode-full job as we have only 2 nodes there.
> 
> > >
> > >Thanks in advance,
> > >
> > >Arnaud.
> 
> -- 
> Slawek Kaplonski
> Principal Software Engineer
> Red Hat