1、RTU的介绍
RTU licensing是没有和UDI（unique device identifier）或SN绑定的一种模型。
在你接受了最终用户许可协议（EULA）后，使用RTU license在WLC配置你期望的AP计数。
这里允许你在控制器上添加AP的计数。RTU license支持如下WLC：
Cisco 3504 WLC
Cisco 5520 WLC
Cisco 8540 WLC
Cisco vWLC
在RTU许可模型中，可以使用以下类型的许可证：
1、Permanent/Base licenses[永久或基本许可证：这些许可证在制造时被编程到控制器硬件中.这些许可证是无法删除或转换的基本计数许可证。
2、Adder licenses：这些许可证是您可以通过接受RTU EULA激活的AP计数许可证。EULA声明您有义务在激活licenses时激活购买的指定的AP count。必须为购买的AP计数激活这些许可证并接受EULA。
我们可以从一个控制器中删除adder许可证，并将许可证转移到同一产品系列中的另一个控制器。
3、Evaluation licenses[评估许可证]：这些许可证是有效期为90天的试用许可证。在90天期限到期前15天，你将收到有关购买永久许可证的通知。这些评估许可证随许可证image一起安装。你可以随时使用命令激活评估许可证。在控制器CLI上运行激活命令后，将提示EULA。 EULA声明您有义务在使用后90天内购买指定的许可证数量。在您接受EULA后开始倒计时。
每当你在控制器上添加或删除AP adder许可证时，系统都会提示RTU EULA。可以为每个添加或删除操作接受或拒绝RTU EULA。
对于启用HA时的高可用性（HA）控制器，控制器将与主控制器的已启用许可证计数同步，并支持高可用性，支持在主控制器上启用许可证计数。
你可以通过控制器GUI或CLI查看RTU许可证。还可以通过Cisco Prime基础设施在查看多个无线控制器上的这些许可证。
在8.1版本中，思科vWLC的许可证管理从基于许可证文件的管理(license-file based management)更改为基于RTU管理的license（Right-to-Use-based management）。以前的许可证仍然有效，当你从早期版本升级到版本8.1时，您只需要再次接受最终用户许可协议EUAL，而不是之前安装的数量。
2、配置RTU
2.1 通过GUI配置RTU
| Step 1 |
Choose
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| Step 2 |
In the Adder License area, choose to add or delete the number of APs that an AP license can support, enter a value, and click Set Count.
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| Step 3 |
Save the configuration.
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2.2 通过CLI配置RTU
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Add or delete the number of APs that an AP license can support by entering this command:
license {add | delete } ap-count count 例如 license add ap-count 200
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Add or delete a license for a feature by entering this command:
license {add | delete } feature license_name
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Activate or deactivate an evaluation AP count license by entering this command:
license {activate | deactivate } ap-count eval
注意：如果激活的许可证支持的AP数量少于连接到控制器的当前AP数量，则激活命令将失败。
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Activate or deactivate a feature license by entering this command:
license {activate | deactivate } feature license_name
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See the licensing information by entering this command:
show license all
注意：在删除或添加license之后，注意保存配置。
3、其他参考
Q. What is Right to Use (RTU) licensing?
A. A Right to Use license scheme is an honor-based model for licensing. Licenses are not tied to an unique device identifier (UDI), product ID, or serial number.
Q. How is RTU licensing enabled?
A. Wireless access point licenses can be enabled through the command-line interface (CLI) with acceptance of an End Use License Agreement (EULA) for RTU.
Just as they do today, customers place an order for a controller with embedded access point count license or a separate access point count adder license. For the access point count adder license, they will receive an e-license or paper license after payment. There is no license PAK or SWIFT, avoiding the need to access the Cisco.com portal or additional external license tools.
Q. What are the benefits and restrictions with RTU licensing?
A. A RTU license scheme simplifies enabling access point adder licenses in the field by eliminating the need for an additional step or additional tools or access to Cisco.com for PAKs or RMA transfer.
You may remove an adder license from one controller and transfer the license to another controller in the same product family. For example: An adder license such as LIC-CT7500-100A may be transferred (partially or in full) from a Cisco ® Flex 7500 Series Wireless Controller only to another Flex 7500 controller.
NOTE: Licenses embedded in the controller at time of shipment are not transferrable.