The value of vRiaInetAddressPrimaryPreference specifies the order in which the address is used by control plane protocols and applications which require a fixed address of the interface. These include LDP and Segment Routing. When originating packets from this interface, the source IPv6 address follows the selection rules in RFC 6724 except for the specific cases where a fixed address is required. In the latter case, the IPv6 address with the lowest primary-preference index is selected. If the selected address is removed, the system selects the IPv6 address with the next lowest primary-preference index. The address index space is unique across all addresses of a given interface.