Configure High Availability on SD-WAN Edge

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This section describes the high availability deployments and configuration supported on SD-WAN Edge.

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How SD-WAN Edge High Availability (HA) Works
The high availability solution ensures continued traffic flow in case of failures. The SD-WAN Edge is the VMware data plane component that is deployed at an end user’s branch location. SD-WAN Edge 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.
High Availability Deployment Models
The High Availability feature supports the following deployment models:
Split-Brain Condition
When 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 a broadcast storm on the LAN.
Split-Brain Detection and Prevention
This section covers the mechanisms used to detect and prevent a split-brain state in an Edge deployment using a high availability topology.
Support for BGP Over HA Link
In 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 Status
This section describes the selection criteria used to determine Active and Standby Status.
VLAN-tagged Traffic Over HA Link
This section describes the VLAN-tagged Traffic over an HA Link.
Configure High Availability (HA)
To configure High Availability, configure the Active and Standby Edges.
HA Event Details
This section describes HA events.

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