How to get addresses for VIPAs

VIPA interfaces are always active. IPv6 VIPA interfaces can have only global addresses that are assigned to them. IPv6 VIPA interfaces are not allowed to have link-local addresses because link-local addresses can be used only on the associated LAN and no VIPA LAN is available.

Rule: You must manually configure all addresses that are assigned to IPv6 VIPAs.

To globally enable SOURCEVIPA for IPv6, configure the SOURCEVIPA keyword on the IPCONFIG6 statement. Then, to enable SOURCEVIPA for particular interfaces, use the SOURCEVIPAINTERFACE parameter on the INTERFACE statement for those interfaces. The SOURCEVIPAINTERFACE parameter allows for the specification of the interface name of the VIRTUAL6 interface whose addresses should be used as SOURCEVIPA addresses.

Unlike IPv4, where the source VIPA selected is based upon the ordering of the HOME list, IPv6 SOURCEVIPA uses the addresses configured on the VIPA INTERFACE statement referenced by the SOURCEVIPAINTERFACE keyword on the INTERFACE statement for the outbound interface. When that VIPA interface has multiple addresses configured, the default source address selection algorithm selects among them. For detailed information about the algorithm, see Default source address selection.

Guidelines:

Use different prefixes for IPv6 static VIPAs and for the IPv6 addresses assigned to real interfaces.
Configure static VIPAs with different prefixes than real addresses. Configuring static VIPAs in this way reduces the likelihood of address collisions between the manually configured VIPAs and the autoconfigured addresses of the real interfaces. This kind of configuration is also necessary because duplicate address detection (DAD) is not performed for VIPA addresses.

See Assigning IPv6 addresses for information about static VIPAs.