Upgrade Scenarios

• Upgrade from IPv4 to dual is incremental and supported if the node interface has the IPv6 address.
• For a multi-node deployment, the installer prompts for an optional Virtual IPv6 address. If you enter Virtual IPv6 address, the IP mode will be updated to Dual or else it remains as IPv4.
• For a single-node deployment, the IP mode will be updated to Dual if node interface has IPv6 address.
• IPv4 and Dual mode use IPv4 address as Peer IP and virtual IP. Similarly, IPv6 mode uses IPv6 addresses. The Inter IP mode upgrades are disruptive and not supported. System will show an appropriate error for invalid IP mode upgrades.

The following table describes the upgrade matrix for IP mode combinations during upgrades:

From	To	Support
Dual	IPv6	No
Dual	IPv4	No
IPv4	IPv6	No
IPv4	Dual	Yes
IPv6	Dual	No
IPv6	IPv4	No
IPv4	IPv4	Yes
IPv6	IPv6	Yes
Dual	Dual	Yes

Use the following guidelines during an upgrade for best results:

From	To	Comments
IPv4	Dual	Add IPv6 address on node interfaces. Do not remove or change IPv4 addresses.
IPv6	IPv6	Do not remove or change IPv6 addresses on node interfaces.
Dual	Dual	Do not remove or change IPv4 and IPv6 addresses on node interfaces.
IPv4	IPv4	Do not remove or change IPv4 addresses on node interfaces.