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.

Refer to the following topics:

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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 SASE 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
When a pair of Edges are configured in a High Availability topology, the Active SD-WAN Edge will exchange BGP routes over the HA link. Where Enhanced HA is used, BGP on the Active Edge establishes neighborship with a peer connected only to the standby Edge’s WAN link.
High Availability Graceful Switchover with BGP Graceful Restart
For a site deployed in a High Availability topology where BGP is also used, an HA failover can be both slow and disruptive to customer traffic because the peer Edges have deleted all the routes on a failover. In Release 5.1.0 and later VMware adds the BGP Graceful Restart feature for HA deployments which ensures faster and less disruptive HA failovers.
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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