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In the network tab when VPC is selected then UI will show a additional button to create routed VPCs as

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The user while creating a VPC can select the Default<Private/Public>RoutedVPCNetworkOffering that will enforce the Super IPv4 CIDR to be in the Super IPv4 CIDR of the zone. If the user does not provide any value then the cloudstack will automatically pick a /24 CIDR as the super CIDR for this VPC. An appropriate error will be given if the zone has exhausted all /24 CIDRs.

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Creating routed VPC tier

When a VPC tier is created, the user shall configure an IPv4 CIDR and the IPv4 gateway. The tier IPv4 CIDR should be within the super IPv4 CIDR configured for its VPC. In this case it would be /27 prefix. If the user does not configure any value, Cloudstack automatically picks an unused /27 CIDR and assigns it to the VPC tier. 

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In general for selecting CIDRs for the VPC user will enter the netmask for his VPS and various tiers. Management server will verify the mask and will look for a available range corresponding to that mask. If a range is available MS will use that or else will flag an error.

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The workflow for VPC creation will look as below:

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The Routed VPC creation and configuration will be similar to the creation of a regular VPC, only that the Super CIDRs of various tiers are carved from the zone's configured Super CIDR for dynamically routed VPCs.

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