WLC Anchor Design for Multiple Branches

Hello Guys,

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I have a customer who has the following design:

1- One WLC in the Head Office

2- APs are configured as flexConnect and joining the WLC in Head Office

The new Requirement is Guest WLAN in all branches. I know you can have an Anchor WLC in the DMZ and the guests will be tunneled directly to the Anchor WLC in the DMZ which will isolate them from the LAN and they can surf the internet.

The problem is that if we place the Anchor WLC in the DMZ of the head office then all the guests from all branches will use the Head Office internet since the Anchor WLC is physically there. However, the requirement is that all the guests must use the branches' internet gateway.

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Should we place Anchor WLCs in all the branches to fulfill the requirement or there is a workaround?

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thanks in advance