The current IPv6 enabled or disabled state of this XCC.
NOTE: If IPv6 address(es) have been configured for one or more
interfaces/protocols/services on this XCC, when you update
the firmware to a level which does not support IPv6, all IPv6
connectivity will be lost, and services/interfaces for which an IPv6
address was configured may not function properly. You will be required
to reconfigure these services/interfaces.