This document discusses techniques for achieving high availability in OpenStack Neutron. It describes enabling technologies like Pacemaker and HAProxy that provide redundancy. It also outlines several built-in Neutron mechanisms for high availability, including keeping DHCP and metadata agents highly available, and using Virtual Router Redundancy Protocol (VRRP) for L3 agent HA. Distributed Virtual Routing (DVR) is also discussed as a way to improve availability by distributing routing functionality across compute nodes.