300-425 · Question #10
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?
The correct answer is D. Use the same IP address for each WLC. All WLCs in a Cisco mobility group must share the same virtual IP address to ensure seamless client roaming between controllers.
Question
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?
Options
- AEnsure that the DNS entry is tied to the virtual IP address of the WLC.
- BUse a unique IP address for each WLC.
- CEnsure that the DNS Host Name field is defined.
- DUse the same IP address for each WLC.
How the community answered
(20 responses)- A10% (2)
- C5% (1)
- D85% (17)
Why each option
All WLCs in a Cisco mobility group must share the same virtual IP address to ensure seamless client roaming between controllers.
DNS entries are associated with the management IP address for administrative access, not the virtual IP address that governs mobility behavior.
Using a unique IP address for each WLC is specifically the incorrect approach - the virtual IP must be shared across all controllers in the mobility group.
The DNS Host Name field is optional and is not a requirement for proper client roaming between controllers in a mobility group.
The virtual IP address on all controllers in a mobility group must be identical because it is used as a gateway IP during anchor-foreign controller communication and DHCP relay operations when clients roam. If controllers had unique virtual IPs, inter-controller roaming would fail as clients would receive conflicting gateway information during handoff.
Concept tested: WLC mobility group virtual IP address consistency
Source: https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107188-virtual-ip-mobility-config.html
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