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• While creating a network, the network offering chosen will define if the network is persistent or not 
  • This will depend on if the new flag 'isPersistent' introduced in network offering is turned on or off in the chosen network offering
• If the user chooses to make the network persistent, then along with network creation (i.e. making a db entry) the network will also be provisioned
  • Provisioning a network is network implementation i.e. allocating resources and VLAN id
• In the below mentioned scenarios a new network is created. The network that is created should be persistent if the network-offering available for the specified account is persistent, 
  1. When createVlanIpRange API is called such that the account the range is being dedicated to has no network
  2. When assignVirtualMachine API is called such that the account a VM is being moved to has no network 

Network updation

• An existing network can be made persistent by updating its network offering to an offering that has the IsPersistent flag set to true
  • While setting this property if the network doesn't have any running VM’s then the it will also be provisioned
• Network offering of a network is updated from a persistent network offering to a non-persistent one
  • If the network has no running VM's, during the next GC run the network will be shutdown

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• In 'Add network offering' add a check-box called 'Persistent'
  •  Action Action to perform if the check box is selected – In CreateNetworkOffering API call, set Boolean parameter 'isPersistent' to true
  • If the 'Guest-Type' selected is Shared hide the 'Persistent' check box and in CreateNetworkOffering API call, set Boolean parameter 'isPersistent' to false
• Under 'Service Offerings - Network Offerings' for every Network Offering display a new field called 'Is Persistent'
  • The value of this property is – the value of the response element isPersistent when ListNetworkOfferings API is called

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