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Addressing "Can i have multiple Neutron instances in the same cloud?"
See - High Availability using VRRP (L3HA) with Open vSwitch
1. http://docs.openstack.org/networking-guide/scenario_l3ha_ovs.html
2. http://www.linux.com/community/blogs/133-general-linux/862741-vrrp-four-nodes-setup-on-rdo-liberty-centos-71

Setup VRRP (two Network Nodes running keepalived ) doesn't require HA Controller Setup,which needs 3 boxes as well as configuration of of Multi Master Synchronous Replication for MySQL Galera DB . Just one Neutron Server
on Controller is enough.

Addressing "Can i have multiple Neutron instances in the same cloud?"
See - High Availability using VRRP (L3HA) with Open vSwitch
1. http://docs.openstack.org/networking-guide/scenario_l3ha_ovs.html
2. http://www.linux.com/community/blogs/133-general-linux/862741-vrrp-four-nodes-setup-on-rdo-liberty-centos-71

Setup VRRP (two Network Nodes running keepalived ) doesn't require HA Controller Setup,which needs 3 boxes as well as configuration of of Multi Master Synchronous Replication for MySQL Galera DB . DB. Just one Neutron Server
Server on Controller is enough.