This section describes how to enable high availability on SD-WAN Edge. What to read next Overview of SD-WAN Edge HAThe SD-WAN Edge is the VMware data plane component that is deployed at an end user’s branch location. SD-WAN Edges configured in High Availability (HA) mode are mirror images of each other and they show up on the SD-WAN Orchestrator as a single SD-WAN Edge. PrerequisitesThis section describes HA requirements that must be met before configuring a SD-WAN Edge as a Standby. High Availability OptionsEdges can be installed as a single standalone device or paired with another Edge to provide High Availability (HA) support. However, the HA configuration is supported only on wired WAN connections. Split-Brain ConditionWhen the HA link is disconnected or when the Active and Standby Edges fail to communicate with each other, both Edges assume the Active role. As a result, both Edges start responding to ARP requests on their LAN interfaces. This causes LAN traffic to be forwarded to both Edges, which could result in spanning tree loops on the LAN. Split-Brain Detection and PreventionThis section covers the mechanisms used to detect and prevent a split-brain state in an Edge deployment using a high availability topology. Failure ScenariosThis section describes the following scenarios that can trigger a failover from an Active to a Standby Edge. Support for BGP Over HA LinkIn case the Edges switch to the enhanced HA option, the Active SD-WAN Edge will exchange BGP routes over the HA link. BGP on the Active Edge can now establish neighborship with a peer connected only to the standby Edge’s WAN link. Selection Criteria to Determine Active and Standby StatusThis section describes the selection criteria used to determine Active and Standby Status. VLAN-tagged Traffic Over HA LinkThis section describes the VLAN-tagged Traffic over an HA Link. Configure HATo configure High Availability, configure the Active and Standby Edges. HA Event DetailsThis section describes HA events. Deploying HA on VMware ESXiYou can deploy the VMware SD-WAN HA on VMware ESXi using the supported topologies.
