Cross Gateway Roaming is a powerful feature on the Controller that allows an authenticated end user to roam seamlessly within a large network deployment where multiple WLAN controllers are in service at different locations. Note that "authenticated end user" here refers to an end user that has been authenticated by any of the internal/external authentication options on the Controller.
Normally, when a user moves from an edge AP managed by one Controller to another edge AP managed by another Controller, the user would experience network disconnection and have to re-login. However, with Cross Gateway Roaming, the user can stay logged in to the network and continue to enjoy network access without interruption.
Cross Gateway Roaming adopts a star topology that consists of one Master Node that sits at the center and multiple Slave Nodes that connect to it. One Master Node may connect with up to 15 Slave Nodes. A Controller can be in Master Mode or Slave Mode depending on its Cross Gateway Roaming settings.
This technical guide aims to explain the setup flow of Cross Gateway Roaming on the Controller. Below are two exemplary network deployments that deploy Cross Gateway Roaming so that authenticated users could seamlessly roam within the larger network.
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