看样子是使用了interface group，绑定了多个vlan，本来这是一个比较好的方式，隔离广域网，同时可以在某个网段出现问题的时候，标记为dirty，然后获取其他网段的IP。
如果需要固定到某个网段的话，可以在DHCP Server端绑定客户端的IP吧，或者开启一下WLAN接受静态的IP客户端，客户端静态配置IP。
vlan select的实现方式也还有其他的：比如AP Group，或者使用AAA override来让客户端授权到对应的vlan。
The priority order for configuring VLAN interface select for WLAN is:
◦AAA override
◦AP group
◦DHCP server override
◦Interface group
◦While you configure VLAN-ACL mapping using the native VLAN identifier as part of Flex group
configuration, the ACL mapping does not take place. However, if you use the same VLAN to configure
ACL mapping at the access point level, the configuration is allowed.
相关限制也可以阅读如下文档：
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-2/config-guide/b_cg82/b_cg82_chapter_010101101.pdf
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