To establish an iSCSI session, the initiator and target connection endpoints must both have either IPv4 or IPv6 addresses. If you are performing cluster-wide discovery and the specified target IP type is IPv6, then an IPv6 address must be assigned to all of the initiator source ports with the specified port ID. If you are performing I/O-group-specific discovery and the specified target IP type is IPv6, then an IPv6 address must be assigned to all of the initiator source ports in the I/O group with the specified port ID.
Use the management GUI or the cfgportip command to assign IP addresses with an IP type that matches the target IP. Alternatively, you can configure an IP address that matches the IP type of the source ports on the target controller port.