OpenStack network nodes contain: neutron DHCP agent neutron L2 agent Neutron L3 agent neutron metadata agent neutron lbaas agent The neutron L2 agent does not need to be highly available. It has to be installed on each Data Forwarding Node and controls the virtual networking drivers as Open vSwitch or Linux Bridge. One L2 agent runs per node and controls its virtual interfaces. That’s why it cannot be distributed and highly available.