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You need to configure second l3 agent.

but I'm not sure where to execute this (network node and/or computes ?)

You could install neutron-l3-agent on any node which connected to required 'public' net.

However, configuring second agent on the same node as the first may be tricky because you will need to create corresponding init sctipt manually.

So the simpliest way is to install it on another node and configure as shown in the guide:

For the first agent, invoke it with the following l3_agent.ini where handle_internal_only_routers is True.

handle_internal_only_routers = True
gateway_external_network_id = 2118b11c-011e-4fa5-a6f1-2ca34d372c35
external_network_bridge = br-ex

For the second (or later) agent, invoke it with the following l3_agent.ini where handle_internal_only_routers is False.

handle_internal_only_routers = False
gateway_external_network_id = e828e54c-850a-4e74-80a8-8b79c6a285d8
external_network_bridge = br-ex-2