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It is not currently possible to run multiple L3 agents for a given network.

You may want to read up on the Neutron Distributed Virtual Router (DVR) effort, which aims to (a) provide Neutron with better availability and (b) to reduce the use of a single L2 router for communication between servers on the same network.

As far as I can tell, this effort does not address your specific use case -- specifcally, I do not believe it supports more than a single active L3 agent for a given external network (but it does provide for failover -- including connection tracking information -- for L3 routers).