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1b1ed1a
(Get the code!)
I think the physical router should advertise gateway subnet to other datacenter.
For example, the upstream physical router ip address 172.16.1.1, so the gateway of neutron router is 172.16.1.1, the upstream physical router should advertise 172.16.1.0/24 to other datacenter, to make the underlay knows how to route 172.16.1.0/24.