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From what i understand from the documentation i cannot create multiple exxternal networks in neutron if i don't have multiple l3 agents running.

You can support multiple external networks with a single L3 agent, see, for example this. However, I don't think that is going to solve your problem, because each network needs to be mapped to a bridge device, and you external interface can only be a member of a single bridge device.

You could probably hack something together with some veth devices, like this:

image description

That is, create one bridge for each external network and configure those in Neutron, then create another bridge that will be used to connect both of those bridges to your external interface.