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You are correct in your assessment.

Currently, if you are using the native Open vSwitch based drivers, there can only be one active L3 router for each network. If you have multiple L3 routers you can have them hosted on multiple systems (so you could, in theory, split a /24 up into multiple smaller subnets to distribute the traffic).

You may also be able to solve this problem by using a vendor plugin with Neutron to utilize the features of equipment from Cisco, Juniper, etc, all of which may be able to probide a more scalable solution.