An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?
A. Ensure that the DNS entry is tied to the virtual IP address of the WLC.
B. Use a unique IP address for each WLC.
C. Ensure that the DNS Host Name field is defined.
D. Use the same IP address for each WLC.
The answer is D.
“This address needs to be the same for all controllers that are members of the same mobility group name.” on page 10-16 in Enterprise_Mobility_8-1_Deployment_Guide.
I agree the answer is D.
• All controllers within a mobility group must be configured with the same virtual interface IP address.
Otherwise, inter-controller roaming may appear to work, but the handoff does not complete, and the
client loses connectivity for a period of time.
802.11r also enables faster roaming by allowing encryption keys to be stored on network APs so the client does not need to perform the complete authentication process every time it roams to a new AP within the network.
Answer = B