Dell W-7030 AOS 6.4.x User Guide - Page 777

A spectrum monitor or hybrid AP automatically disconnects from a client when you close the browser window you used to connect the spectrum monitor to your client. However, if you use Internet Explorer and have multiple instances of an Internet Explorer browser open, the data-streaming connection to the spectrum monitor or hybrid AP is not released until 60 seconds after you close the spectrum client browser window. During this 60-second period, the spectrum monitor is still connected to the client. When a spectrum monitor or hybrid AP is not subscribed to any client, it still performs all classification tasks and collect all necessary channel lists and device information. You can view classification, device, and channel information for any active spectrum monitor or hybrid AP via the controller's command-line interface, regardless of whether or not that device is sending real-time spectrum data to another client WebUI. Individual spectrum analysis graphs and charts are explained in detail in Customizing Spectrum Analysis Graphs on page 786. Hybrid AP Channel Changes By default, a hybrid AP only monitors the channel specified in its 802.11a or 802.11g radio profile for spectrum interference. If you want to change the channel monitored by a hybrid AP, you must edit the channel setting in those profiles. However, there are other ArubaOS features that may automatically change the channels on hybrid APs. APs using Dynamic Frequency Selection (DFS) perform off-channel scanning to detect the presence of satellite and radar transmissions, and switch to a different channel if it detects that satellite or radar transmissions are present. APs using the Adaptive Radio Response (ARM) feature constantly monitor the network and automatically select the best channel and transmission power settings for that AP. If you manually change a channel monitored by a hybrid AP, best practices are to temporarily disable the ARM feature, as ARM may automatically return the channel to its previous setting. If a hybrid AP is using ARM or DFS, that hybrid AP may automatically move to a different channel in response to changes in the network environment. If a hybrid AP changes channels while it is connected to a spectrum analysis client, the hybrid AP updates the graphs in the spectrum dashboard to start displaying spectrum data for the new channel, and sends a log message to the session log. For details on changing the channel monitored by a hybrid AP, see 802.11a and 802.11g RF Management Profiles on page 593. Hybrid APs Using Mode-Aware ARM If a radio is configured as a hybrid AP and that AP is enabled with mode-aware ARM, the hybrid AP can change to an Air Monitor (or AM) if too many APs are detected in the area. If the ARM feature changes a hybrid AP to an Air Monitor, that AM does not provide spectrum data after the mode change. The AM unsubscribes from any connected spectrum analysis client, and sends a log message warning about the change. If mode-aware ARM changes the AM back to an AP, the hybrid AP does not automatically resubscribe back to the spectrum analysis client. The hybrid AP must manually resubscribed before it can appear in the client's spectrum monitors page. Creating Spectrum Monitors and Hybrid APs Each controller can support up to 22 active WebUI connections to spectrum monitor or hybrid AP radios. If you plan on using spectrum monitors or hybrid APs as a permanent overlay to constantly monitor your network, you should create a separate AP group for these devices. If you plan on temporarily converting campus APs to spectrum monitors, best practices are to use the spectrum local override profile to convert an AP to a spectrum monitor. This section describes the following tasks for converting regular APs into hybrid APs or spectrum monitors. l Converting APs to Hybrid APs on page 778 l Converting an Individual AP to a Spectrum Monitor on page 778 777 | Spectrum Analysis Dell Networking W-Series ArubaOS 6.4.x | User Guide