•  High availability is supported between SteelHead EXs of the same model and series.

•  High availability is supported between SteelHead EXs, not in SteelHead EX-to-ESX configurations.

•  The primary interfaces and the in-path interfaces of the HA pair of SteelHead EXs must be on the same subnet.

•  The aux interfaces of the HA pair of SteelHead EXs must be on separate subnets.

•  SteelFusion must be licensed on the SteelHead EXs.

•  vSphere must be licensed at the Standard level or later.