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1. Zone : When a zone is created, user shall be able to enter configure the super IPv6 CIDR and Autonomous System(AS) Number. Initial implementation will use this CIDR only for VPCs in the Zone. Later one more field could be added for Isolated networks too(in which case each isolated network will get a /64 from the CIDR configured for Isolated network). AS number is will be used for the BGP session as described below in section BGP on VPC Router

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2.  VPC : When a VPC is created, user shall configure an IPv6 CIDR. It should be within the super IPv6 CIDR configured for the Zone. In this case it would be a /60 prefix. Initial implementation would be to split super IPv6 CIDR to /60 for VPCs. If user does not configure any value, CloudStack automatically picks an unused /60 CIDR and assigns it to the VPC. So, it is not a mandatory attribute. Appropriate error will be given to user, if he tries to configure IPv6 CIDR with out configuring the super IPv6 for the Zone.

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3. VPC Tier : When a VPC tier created, user shall configure an IPv6 CIDR. It should be within the IPv6 CIDR configured for its VPC. In this case it would be a /64 prefix. If user does not configure any value, CloudStack automatically picks an unused /64 CIDR and assigns it to the VPC. So, it is not a mandatory attribute. Appropriate error will be given to user, if he tries to configure IPv6 CIDR with out configuring the super IPv6 for the Zone.

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IPv6 in VPC Router

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