300-370 · Question #1
A company consists of two adjacent buildings, each with its own Cisco 5508 Wireless Controller with APs joined to the controller in the building. The two controllers are configured identically…
The correct answer is C. Configure controller B to be in a separate RF group. To improve client connections in Building B, which experiences co-channel interference and RRM issues while in a shared RF group with Building A, configuring Controller B to be in a separate RF group is the most effective solution.
Question
A company consists of two adjacent buildings, each with its own Cisco 5508 Wireless Controller with APs joined to the controller in the building. The two controllers are configured identically except for interface IP addresses. Only one SSID is being used in both buildings. The clients in building A are not experiencing any connectivity issues, but (he clients in building B report poor connections An engineer performs a site survey and finds co-channel interference, yet discovers mac Transmit Power Control was never performed on the APs and that Radio Resource Management is not functioning like it does in building A Furthermore, the controllers are in the same RF group and controller A is elected RF leader. Which action will improve client connections in building B?
Options
- AEnsure WMM is enabled on the SSID.
- BManually select controller B as RF group leader.
- CConfigure controller B to be in a separate RF group.
- DDoable the low data rates on the a radio and the b/g radio in building B.
How the community answered
(29 responses)- A14% (4)
- B3% (1)
- C79% (23)
- D3% (1)
Why each option
To improve client connections in Building B, which experiences co-channel interference and RRM issues while in a shared RF group with Building A, configuring Controller B to be in a separate RF group is the most effective solution.
Ensuring WMM is enabled primarily prioritizes traffic types (voice, video, best effort) but does not resolve co-channel interference or enable proper Radio Resource Management (RRM) for channel and power assignment.
Manually selecting Controller B as the RF group leader would still mean both buildings are managed under a single RF group, which might not resolve the distinct RF challenges of Building B, especially if the environments are too different for a unified RRM approach.
Configuring Controller B in a separate RF group allows its Radio Resource Management (RRM) to operate independently for Building B's specific RF environment. This enables the controller to make optimal channel and power assignments for its Access Points (APs) without being influenced by Building A's RF leader, directly addressing the co-channel interference and RRM dysfunction reported in Building B.
Disabling low data rates improves overall network performance by forcing clients to use faster speeds but does not directly address co-channel interference or the malfunctioning Radio Resource Management (RRM) responsible for dynamic channel and power control.
Concept tested: Cisco WLC RF Grouping and RRM optimization
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-0/configuration-guide/b_cg80/b_cg80_chapter_01000.html#ID2277
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