Also consider loss of IPv6 default route to be fatal

            delta = ProvisioningChange.LOST_PROVISIONING;

        }

        // Additionally:

        //

        // If the previous link properties had a global IPv6 address and an

        // IPv6 default route then also consider the loss of that default route

        // to be a loss of provisioning. See b/27962810.

        if (oldLp.hasGlobalIPv6Address() && oldLp.hasIPv6DefaultRoute() &&

                !newLp.hasIPv6DefaultRoute()) {

            delta = ProvisioningChange.LOST_PROVISIONING;

        }

        return delta;

    }