350-401 · Question #269
What is required for intercontroller Layer 3 roaming?
The correct answer is A. Mobility groups are established between wireless controllers.. Intercontroller Layer 3 roaming in a Cisco wireless environment requires that wireless controllers are configured within the same mobility group to share client context across different subnets.
Question
What is required for intercontroller Layer 3 roaming?
Options
- AMobility groups are established between wireless controllers.
- BThe management VLAN is present as a dynamic VLAN on the second WLC.
- CWLCs use separate DHCP servers.
- DWLCs have the same IP addresses configured on their interfaces.
How the community answered
(17 responses)- A88% (15)
- B6% (1)
- D6% (1)
Why each option
Intercontroller Layer 3 roaming in a Cisco wireless environment requires that wireless controllers are configured within the same mobility group to share client context across different subnets.
Mobility groups are essential for Layer 3 roaming between Cisco Wireless LAN Controllers (WLCs). WLCs in the same mobility group can communicate, exchange client context, and tunnel traffic, allowing clients to roam seamlessly between APs associated with different WLCs, even when the WLCs are in different IP subnets.
While the management VLAN must be reachable, it does not need to be configured as a dynamic VLAN on the second WLC for intercontroller Layer 3 roaming.
WLCs can use separate DHCP servers, but this is not a specific requirement for Layer 3 roaming; the client's IP address is maintained via tunneling during the roam.
WLCs must have unique IP addresses configured on their interfaces to function correctly within an IP network; having the same IP addresses would cause conflicts.
Concept tested: WLC mobility groups for Layer 3 roaming
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/mobility_groups.html
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