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See https://wiki.openstack.org/wiki/Neutron/L3_High_Availability_VRRP
Neutron/L3 High Availability VRRP
Per https://assafmuller.com/2015/04/15/distributed-virtual-routing-overview-and-eastwest-routing/
DVR (Ditributed Virtual Routing ) aims to isolate the failure domain of the traditional network node and to optimize network traffic by eliminating the centralized L3 agent shown above. It does that by moving most of the routing previously performed on the network node to the compute nodes.