Multi-AP Specification下载地址：https://www.wi-fi.org/download.php?file=/sites/default/files/private/Multi-AP_Specification_v2.0.pdf
#依赖百度翻译&Google翻译&个人理解
#如果有错误地方，请帮忙指出， 感谢
12 Backhaul optimization
In a Multi-AP network, the backhaul STA of a Multi-AP Agent connects to a BSS to access backhaul connectivity. A Multi-AP Agent might have chosen from multiple candidate BSSs during onboarding and subsequently a Multi-AP Controller might want to move that Multi-AP Agent to a different BSS.
在Multi-AP网络中，Multi-AP代理的Backhaul STA连接到BSS以访问Backhaul连接。Multi-AP代理可能在入站期间从多个候选BSS中选择，随后Multi-AP控制器可能希望将该Multi-AP代理移动到不同的BSS。(一个Backhaul STA开始连接时，随机从一个Backhaul AP中选一个，后续控制器会根据算法，让此代理连接到一个特定的Backhaul AP,以达到速率最优)
If triggered, a Multi-AP Controller shall send a Backhaul Steering Request message to request the Multi-AP Agent to connect its backhaul STA to a different BSS per section 17.1.29.
如果触发，Multi-AP控制器应根据第17.1.29节发送Backhaul steering请求消息，请求Multi-AP代理将其Backhaul STA连接到列外一个BSS（AP）上。
If a Multi-AP Agent receives a Backhaul Steering Request message, then it shall respond within one second with a 1905 Ack message to the Multi-AP Controller and attempt to (re-)associate with the target BSS specified in the message. After the Multi-AP Agent has associated with the target BSS successfully or 10 seconds has expired since the reception of the Backhaul Steering Request message, the Multi-AP Agent shall send a Backhaul Steering Response message to the Multi-AP Controller per section 17.1.30. If the Multi-AP Agent successfully associated with the target BSS specified in the Backhaul Steering Request message, the Multi-AP Agent shall set the result code in the Backhaul Steering Response
TLV to 0x00.
如果Multi-AP代理接收到Backhaul转向请求消息，则它应在一秒钟内向Multi-AP控制器发送1905 Ack消息，并尝试（重新）关联消息中指定的目标BSS。在Multi-AP代理成功地与目标BSS关联后，或在收到Backhaul转向请求消息10秒后，Multi-AP代理应根据第17.1.30节向Multi-AP控制器发送Backhaul转向响应消息。如果Multi-AP代理成功关联Backhaul转向请求消息中指定的目标BSS，则Multi-AP代理应在Backhaul steering响应中设置结果代码 TLV到0x00。
If the Multi-AP Agent cannot (re-)associate with the target BSS specified in the Backhaul Steering Request message, the Multi-AP Agent shall set the result code in the Backhaul Steering Response TLV to 0x01 and include an Error Code TLV in the Backhaul Steering Response message with the reason code set to one of the 0x04, 0x05 and 0x06 per section
17.2.36.
如果Multi-AP代理无法（重新）关联Backhaul转向请求消息中指定的目标BSS，则Multi-AP代理应将Backhaul转向响应TLV中的结果代码设置为0x01，并在Backhaul转向响应消息中包含错误代码TLV，原因代码根据17.2.36，可以设置为0x04、0x05和0x06中的一个。
In general, when a Multi-AP Agent performs the steering requested by the Multi-AP Controller, there might be a brief user data interruption on the STAs that are associated with the Multi-AP Agent due to data path change and the duration of the steering (similar to steering by using the BSS Transition Management message on a STA). If a Multi-AP Agent’s fronthaul BSS is operating on the same channel as its backhaul STA and the Multi-AP Agent receives a Backhaul Steering Request message that requires the backhaul STA to switch to a different channel, there might be connection interruption on the clients that are associated with the Multi-AP Agent’s fronthaul BSS while the channel switch occurs. The Multi-AP Controller should attempt to minimize or avoid such interruption if possible in such cases (e.g. by steering the clients to another fronthaul BSS, if available, prior to triggering backhaul steering).
一般来说，当Multi-AP代理执行Multi-AP控制器请求的steering时，由于数据路径的改变和steering的持续时间（类似于在STA上使用BSS转换管理消息进行steering），在与Multi-AP代理关联的STA上可能会出现短暂的用户数据中断。如果Multi-AP代理的fronthaul BSS与其Backhaul STA在同一个信道上运行，并且Multi-AP代理收到Backhaul转向请求消息，该消息要求Backhaul STA切换到其它信道，发生信道切换时，与Multi-AP代理的fronthaul BSS关联的客户端上可能会出现连接中断。在这种情况下，如有可能，Multi-AP控制器应尽量减少或避免此类中断（例如，在触发Backhaul steering之前，通过将客户引导至另一个Fronthaul BSS）。
If a Multi-AP Controller receives a Backhaul Steering Response message, then it shall respond within one second with a 1905 Ack message to the sender of the message.
如果Multi-AP控制器接收到Backhaulsteering响应消息，则其应在1秒内以1905 Ack消息向消息发送方作出响应。
12.1 Backhaul optimization by backhaul station association control
A Backhaul BSS on a Multi-AP Agent that implements Profile-2 can be configured by a Multi-AP Controller to disallow association of backhaul STAs that would result in either a Profile-1 backhaul link or a Profile-2 backhaul link. A Multi-AP Controller can configure this feature when onboarding the Multi-AP Agent, by setting bits 3 and 2 to one in the Multi-AP Extension subelement in the AP-Autoconfiguration WSC message (see section 5.2) or at any point in time by setting bit 7 and 6 to one in the Backhaul BSS Configuration TLV of a Multi-AP Policy Config Request message (see section 7.3).
实现Profile-2的Multi-AP代理上的Backhaul BSS可以由Multi-AP控制器配置为不允许Backhaul STA的关联，这将导致Profile-1 Backhaul链路或Profile-2 Backhaul链路。Multi-AP控制器可以在Multi-AP代理连接时配置此功能，通过将AP自动配置WSC消息中的Multi-AP扩展子元素中的位3和2设置为1（请参阅第5.2节），或通过在Multi-AP策略配置请求消息的Backhaul BSS配置TLV中将位7和6设置为1（请参阅第7.3节）。
If a Multi-AP Agent sets the Profile-2 bSTA Disallowed bit to one on the backhaul BSS, and receives an Association Request frame on that backhaul BSS from a backhaul STA that includes a Multi-AP Profile subelement indicating Multi-AP Profile-2, then the Multi-AP Agent shall reject the association request (see 18) on that backhaul BSS.
如果Multi-AP代理将Backhaul BSS的Profile-2 bSTA Disallowed bit设置为1，并且从Backhaul STA接收到该Backhaul BSS上的关联请求帧，该Backhaul STA包括指示Multi-AP Profile-2的Multi-AP Profile子元素，则该Multi-AP代理应拒绝Backhaul STA发送给Backhaul BSS上的关联请求（参见18）。
If a Multi-AP Agent sets the Profile-1 bSTA Disallowed bit to one on the backhaul BSS, and receives an Association Request frame on that backhaul BSS from a backhaul STA that does not include a Multi-AP Profile subelement, then the Multi-AP Agent shall reject the association request (see 18) on that backhaul BSS.
如果Multi-AP代理将Backhaul BSS的Profile-1 bSTA Disallowed bit设置为1，并且从不包括Multi-AP Profile子元素的Backhaul STA接收到该Backhaul BSS上的关联请求帧，则该Multi-AP代理应拒绝Backhaul STA发送给Backhaul BSS上的关联请求（参见18）。
Note: When a Multi-AP Agent rejects an association attempt, it does so either by sending an Authentication frame with a “Reject” status code or, if it does not reject the authentication, by sending a (Re-)Association Response frame with a “Reject” status code.
注意：当Multi-AP代理拒绝关联尝试时，它会发送带有“拒绝”状态代码的验证帧，或者，如果它不拒绝身份验证，则发送带有“拒绝”状态代码的（重新）关联响应帧。
If a Multi-AP Agent rejects an Authentication Request or (Re-)Association Request as a result of a “Backhaul STA association disallowed” configuration and it is able to provide one or more alternative backhaul BSS, it shall set the Status Code in the Authentication frame or (Re-)Association Response frame to 82 (rejected_with_suggested_bss_transition) and append at least one Neighbor Report element indicating an alternative backhaul BSS.
如果Multi-AP代理由于“不允许Backhaul STA关联”配置而拒绝身份验证请求或（重新）关联请求，并且它能够提供一个或多个备用Backhaul BSS，它应将认证帧或（重新）关联响应帧中的状态码设置为82（拒绝和建议BSS转换），并附加至少一个表示备选Backhaul BSS的邻居报告元素。
If a Multi-AP Agent rejects an authentication request or (re-)association request as a result of a “Backhaul STA association disallowed” configuration and it is not able to provide a suggested BSS transition target, it shall set the Status Code in the corresponding Authentication frame or (Re-)Association Response frame to 12 (denied other reasons).
如果Multi-AP代理由于“不允许Backhaul STA关联”配置而拒绝身份验证请求或（重新）关联请求，并且它无法提供建议的BSS转换目标，应将相应认证帧或（重新）关联响应帧中的状态码设置为12（因其它原因拒绝）。
A Multi-AP Controller that implements Profile-2 should not request a Multi-AP Agent that implements Profile-1 to associate its backhaul STA to a BSS configured as “Profile-1 Backhaul STA association disallowed”.
实现Profile-2的Multi-AP控制器不应请求实现Profile-1的Multi-AP代理将其Backhaul STA与配置为“Profile-1 Backhaul STA association disallowed”的BSS相关联。
A Multi-AP Controller that implements Profile-2 should not request a Multi-AP Agent that implements Profile-2 to associate its backhaul STA to a BSS configured as “Profile-2 Backhaul STA association disallowed”.
实现Profile-2的Multi-AP控制器不应请求实现Profile-2的Multi-AP代理将其Backhaul STA与配置为“Profile-2Backhaul STA association disallowed”的BSS相关联。