Techniques for avoiding single points of failure in routing components of an SDN are disclosed. In some aspects, control nodes that provide routing management services are assigned zone identifiers. The control nodes having one zone identifier can be on separate processes and/or physical hardware from control nodes having a different zone identifier. Workloads, such as virtual machines or containers, can establish routing sessions such as Border Gateway Protocol as a Service (BGPaaS) routing sessions using different zone identifiers to ensure that separate control nodes provide routing management services for the primary and secondary compute nodes associated with a high availability service. These techniques in this way facilitate high availability by ensuring that a control node is not a single point of failure for the high availability service provided by the primary and secondary compute nodes.