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Administrator wants to be able to assign Vlan to the an Isolated network with the Source Nat Service enabled. He also would like those networks the Vlan to never be GCed.

Architecture and Design description

be assigned to the network for its entire lifecycle. 

General Flow

1) Create a new network offering

Create a network offering with guestIpType=Isolated, specifyVlan=true, isPersistent=true

• specifyVlan=true means that the Admin has to specify the Vlan when he creates the network. 
• isPersistent=true will ensure that the network created from this offering, will never be picked up by the Network Garbage Collection thread, and its Vlan will never be released.

Code changes:1) Network offering creation

• Have to remove the restriction

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• in the code as currently specifyVlan=true is allowed for Shared Network Offerings only.

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2) Create a new network

Create a network from the network offering created on the step #1. Define the Vlan when create the network.

Code changes:

• Vlan assignment to Isolated Networks part of code needs to be changed. At the moment vlan for the Guest Isolated network is randomly allocated from the Vnet range defined on the physical network object. When Admin defines the Vlan for the network, the Vlan should be managed outside of the CloudStack, therefore it should be outside of the Physical Network Vnet range. Basically we should follow the same logic as when we create Shared network with Vlan specified. 
• UI:

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2) Network creation

• Only ROOT admin is aware of the Vlans in the system. So only he can create the

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• Isolated network with the vlan defined

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• . UI should handle it and don't display network offerings with "specifyVlan=true" when create a new

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3) Network GC

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• Isolated network.

DB changes

No DB changes

UI changes

"Create network" dialog changes

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• Display network offering When create tier inside the VPC, show offerings with specifyVlan=true as an option, only on Root admin UIWhen offering with Admin UI. To get this offerings with listNetworkOfferings API, add specifyVlan=true is selected from to the drop down list, display the Vlan field on create network dialog.

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• list of parameters.
• Add and display Vlan field when network offering with SpecifyVlan=true is selected.

Changes have to be done on the on following tabs:

• Networks tab
• VPC->Create new Tier tab

Restrictions: 

• You can't change the Vlan once it's assigned to the network. It will remain with it for the entire network life cycle.