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.
The answer is D
Cisco documentation states the following:
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.
I think it's D
As per Cisco book "Be aware that a controller name is not the same as its DNS entry; rather, it is the name string configured on the individual controller." meaning we can configure the WLC with IP only
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/mobility_groups.html
Prerequisites for Configuring Mobility Groups
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All controllers must be configured with the same virtual interface IP address.
I think the given answer is correct.
Answer D says IP address, not virtual IP address
"To ensure connectivity and web authentication, the DNS server should always point to the virtual interface. If a DNS hostname is configured for the virtual interface, then the same DNS host name must be configured on the DNS server(s) used by the client."
https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_010011101.html
Answer is IP ADDRESS not VIRTUAL IP ADDRESS.
Tricky question but I would go towards A :
"To ensure connectivity and web authentication, the DNS server should always point to the virtual interface. If a DNS hostname is configured for the virtual interface, then the same DNS host name must be configured on the DNS server(s) used by the client."
@Araghas:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-2/config-guide/b_cg82/b_cg82_chapter_010.html
Scroll to step 32:
"In the IP Address field, enter the IP address of the controller’s virtual interface. You should enter a fictitious, unassigned IP address."
"To ensure connectivity and web authentication, the DNS server should always point to the virtual interface. If a DNS hostname is configured for the virtual interface, then the same DNS host name must be configured on the DNS server(s) used by the client."
-> The "if" statement tells is that the DNS host entry is optional.
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