Activate Network Extension High Availability to provide failover protection for extended networks.
Network Extension High Availability activation is initiated only from the source site.
Prerequisites
In the HCX Compute Profile, the Network Extension Appliance Limit is set to allow for the number of Network Extension appliances. See Creating a Compute Profile.
In the HCX Service Mesh, the Network Extension Appliance Scale Out Appliance Count is set to provide enough appliances to support network extension objectives, including any Network Extension HA groups. See Creating a Service Mesh.
- The Network Extension appliances selected for HA activation must have no networks extended over them.
- Only Network Extension appliances upgraded to HCX 4.3.0 or later can be added to HA Groups.
- In environments with vCenter in Linked Mode, all HCX systems have HCX 4.3.0 or later for HA objects to display correctly.
Procedure
Results
After the group is created, the Active and Standby roles for the local and remote appliances display on the HA Management page.

What to do next
Select a Network Extension HA group when extending networks. See Extending Networks Using VMware HCX.