Dell W-Series 304 Instant 6.5.1.0-4.3.1.0 CLI Reference Guide - Page 729

derive channel quality values by measuring the noise floor for that channel. Client Match the ARM client match feature continually monitors a client's RF neighborhood to provide ongoing client bandsteering and load balancing, and enhanced AP reassignment for roaming mobile clients. This feature is recommended over the legacy bandsteering and spectrum load balancing features, which, unlike client match, do not trigger AP changes for clients already associated to an AP. Legacy 802.11a/b/g devices do not support the client match feature. When client match is enabled on 802.11ncapable devices, the client match feature overrides any settings configured for the legacy bandsteering, station handoff assist or load balancing features. 802.11ac-capable devices do not support the legacy bandsteering, station hand off or load balancing settings, so these APs must be managed on using client match. When this feature is enabled on an AP, that AP is responsible for measuring the RF health of its associated clients. The AP receives and collects information about clients in its neighborhood, and periodically sends this information to the controller. The controller aggregates information it receives from all APs using client match, and maintains information for all associated clients in a database. The controller shares this database with the APs (for their associated clients) and the APs use the information to compute the client-based RF neighborhood and determine which APs should be considered candidate APs for each client. When the controller receives a client steer request from an AP, the controller identifies the optimal AP candidate and manages the client's relocation to the desired radio. This is an improvement from previous releases, where the ARM feature was managed exclusively by APs, the without the larger perspective of the client's RF neighborhood. The following client/AP mismatch conditions are managed by the client match feature: l Load Balancing: Client match balances clients across APs on different channels, based upon the client load on the APs and the SNR levels the client detects from an underutilized AP. If an AP radio can support additional clients, the AP will participate in client match load balancing and clients can be directed to that AP radio, subject to predefined SNR thresholds. l Sticky Clients: The client match feature also helps mobile clients that tend to stay associated to an AP despite low signal levels. APs using client match continually monitor the client's RSSI as it roams between APs, and move the client to an AP when a better radio match can be found. This prevents mobile clients from remaining associated to an APs with less than ideal RSSI, which can cause poor connectivity and reduce performance for other clients associated with that AP. l Band Steering/Band Balancing: APs using the client match feature monitor the RSSI for clients that advertise a dual-band capability. If a client is currently associated to a 2.4 GHz radio and the AP detects that the client has a good RSSI from the 5 Ghz radio, the controller will attempt to steer the client to the 5 Ghz radio, as long as the 5 Ghz RSSI is not significantly worse than the 2.4 GHz RSSI, and the AP retains a suitable distribution of clients on each of its radios. ARM Scanning The default ARM scanning interval is determined by the scan-interval parameter in the ARM profile. If the AP does not have any associated clients (or if most of its clients are inactive) the ARM feature will dynamically readjust this default scan interval, allowing the AP obtain better information about its RF neighborhood by scanning non-home channels more frequently. Starting with ArubaOS 6.2, if an AP attempts to scan a nonhome channel but is unsuccessful, the AP will make additional attempts to rescan that channel before skipping it and continuing on to other channels. Using Adaptive Radio Management (ARM) in a Mesh Network When a mesh portal operates on a mesh network, the mesh portal determines the channel used by the mesh feature. When a mesh point locates an upstream mesh portal, it will scan the regulatory domain channels list to 729| rf arm-profile Dell Networking W-Series ArubaOS 6.5.x | Reference Guide