# Enum - HostNetStackInstanceSystemStackKey(vim.host.NetStackInstance.SystemStackKey)

Since
  vSphere API 5.5

## Enum Description

Define the instance identifier for different traffic type

Enum Constants

Name | Description
--- | ---
defaultTcpipStack | The default stack used by applications
vmotion | Stack key used for vMotion applications Since vSphere API 6.0
vSphereProvisioning | Stack key used for vSphere provisioning NFC traffic Since vSphere API 6.0

Show WSDL type definition
<simpleType xmlns="http://www.w3.org/2001/XMLSchema" xmlns:vsan="urn:vsan" name="HostNetStackInstanceSystemStackKey"> <restriction base="xsd:string"> <enumeration value="defaultTcpipStack"/> <enumeration value="vmotion"/> <enumeration value="vSphereProvisioning"/> </restriction> </simpleType>