neutron l3 agents number

Arnaud Morin arnaud.morin at
Wed Oct 20 15:28:38 UTC 2021

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?

Thanks in advance,


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