Should be L3: C
When a client crosses a mobility group boundary while a roam, the client is fully authenticated, but the IP address is maintained, and EtherIP tunneling is initiated for Layer 3 roaming.
Inter Controller-L3 Roaming : If the clients roam between APs registered to different controllers and the client WLAN on the two controllers is on different subnet, then it is called inter-controller L3 roam.
Layer 2 & Layer 3 Intercontroller Roam
When a mobile client roams from one AP to another, and if those APs are on different WLCs, then the client makes an intercontroller roam.
When a client starts an intercontroller roam, the two WLCs compare the VLAN IDs allocated to their WLAN interfaces.
– If the VLAN IDs are the same, the client performs a Layer 2 intercontroller roam.
– If the VLAN IDs are different, the WLCs will arrange a Layer 3 or local-to-foreign roam.
The answer is C i.e. Layer3. Reason: https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107188-mobility-groups-faq.html#:~:text=Through%20seamless%20roaming%2C%20the%20client,address%20across%20all%20mobility%20groups.
This is what the OCG says in chapter 19, Intercontroler Roaming
If they don't mention any about VLANs... should be a L2 roaming
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