ARM Monitoring and Management
WhenARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.is enabled, theArubaAP dynamically scans all802.11802.11 is an evolving family of specifications for wireless LANs developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE). 802.11 standards use the Ethernet protocol and Carrier Sense Multiple Access with collision avoidance (CSMA/CA) for path sharing.channels in its regulatory domain at regular intervals and will report everything it sees to thecontrolleron each channel it scans (by default,802.11n802.11n is a wireless networking standard to improve network throughput over the two previous standards, 802.11a and 802.11g. With 802.11n, there will be a significant increase in the maximum raw data rate from 54 Mbps to 600 Mbps with the use of four spatial streams at a channel width of 40 MHz.‑capable APs scan channels in all regulatory domains). This includes, but is not limited to, data regardingWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.coverage, interference, and intrusion detection. You can retrieve this information from thecontrollerto get a quick health check of yourWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.deployment without having to walk around every part of a building with a network analyzer. For additional information on the individual matrix gathered on the AP’s current assignedRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.channel, seeARM Coverage and Interference Metrics.
This section describes the following topics:
Maintaining Channel Quality
Hybrid APs and Spectrum Monitors determine channel quality by measuring channel noise, non-Wi-Fi (interferer) utilization and duty-cycles, and certain types of retries. Regular APs using ARM derive channel quality values by measuring the noise floor for both 802.11 and non-802.11 noise on that channel.
TheARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.algorithm is based on what the individual AP hears, so each AP on yourWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.can effectively “self heal” by compensating for changing scenarios like a broken antenna or blocked signals from neighboring APs. Additionally,ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.periodically collects information about neighboring APs to help each AP better adapt to its own changing environment.
Configuring ARM Scanning
The defaultARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.scanning interval is determined by thescan-intervalparameter in theARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.profile. If the AP does not have any associated clients (or if most of its clients are inactive),ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.will dynamically readjust this default scan interval, allowing the AP to obtain better information about itsRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.neighborhood by scanning non-home channels more frequently. If an AP attempts to scan a non-home channel but is unsuccessful, the AP will make additional attempts to rescan that channel before skipping it and continuing on to other channels.
Thefeature allows an AP to get information about itsRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.environment from its neighbors, even if the AP cannot scan. If you enable this feature, when an AP on the network scans a foreign (non-home) channel, it sends an Over-the-Air update in an802.11802.11 is an evolving family of specifications for wireless LANs developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE). 802.11 standards use the Ethernet protocol and Carrier Sense Multiple Access with collision avoidance (CSMA/CA) for path sharing.management frame that contains information about that home channel for that APl, the current transmissionEIRPEffective Isotropic Radiated Power or Equivalent Isotropic Radiated Power. EIRP refers to the output power generated when a signal is concentrated into a smaller area by the Antenna.value of the home channel, and one-hop neighbors seen by that AP.
IfARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.reports a high noise floor on a channel within a 40MHzMegahertzchannel pair or 80MHzMegahertzchannel set,ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.performs an additional 20MHzMegahertzscan on each channel within that channel pair or set, to determine the actual noise floor of each affected channel. This allowsARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.to avoid assigning the overused channel, while still allowing channel assignments to the other unaffected channels in that channel pair or set.
Understanding ARM Application Awareness
ArubaAPs keep a count of the number of data bytes transmitted and received by their radios to calculate the traffic load. When aWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.gets very busy and traffic exceeds a predefined threshold, load-awareARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.dynamically adjusts scanning behavior to maintain uninterrupted data transfer on heavily loaded systems.ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.-enabled APs will resume their complete monitoring scans when the traffic has dropped to normal levels. You can also define afirewallFirewall is a network security system used for preventing unauthorized access to or from a private network.policy that pausesARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.scanning when the AP detects critically important or latency-sensitive traffic from a specified host or network.
ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.’sbandBand refers to a specified range of frequencies of electromagnetic radiation.steering feature encourages dual-bandBand refers to a specified range of frequencies of electromagnetic radiation.capable clients to stay on the 5GHzGigahertz.bandBand refers to a specified range of frequencies of electromagnetic radiation.on dual-bandBand refers to a specified range of frequencies of electromagnetic radiation.APs. This frees up resources on the 2.4GHzGigahertz.bandBand refers to a specified range of frequencies of electromagnetic radiation.for single-bandBand refers to a specified range of frequencies of electromagnetic radiation.clients likeVoIPVoice over IP. VoIP allows transmission of voice and multimedia content over an IP network.phones.
TheARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.Mode Aware option is a useful feature for single radio, dual-bandBand refers to a specified range of frequencies of electromagnetic radiation.WLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.networks with high density AP deployments. If there is too much AP coverage, those APs can cause interference and negatively impact your network. Mode awareARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.can turn APs into Air Monitors if necessary, then turn those Air Monitors back into APs when they detect gaps in coverage. Note that an Air Monitor will not turn back into an AP if it detects client traffic (or client traffic increases), but will change to an AP only if it detects coverage holes.
Using Multi-Band ARM for 802.11a/802.11g Traffic
It is recommended that you use theARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.assignment andARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.feature for single-radio APs in networks with traffic in the802.11a802.11a provides specifications for wireless systems. Networks using 802.11a operate at radio frequencies in the 5 GHz band. The specification uses a modulation scheme known as orthogonal frequency-division multiplexing (OFDM) that is especially well suited to use in office settings. The maximum data transfer rate is 54 Mbps.and802.11g802.11g offers transmission over relatively short distances at up to 54 Mbps, compared with the 11 Mbps theoretical maximum of 802.11b standard. 802.11g employs Orthogonal Frequency Division Multiplexing (OFDM), the modulation scheme used in 802.11a, to obtain higher data speed. Computers or terminals set up for 802.11g can fall back to speed of 11 Mbps, so that 802.11b and 802.11g devices can be compatible within a single network.bandsBand refers to a specified range of frequencies of electromagnetic radiation.. This feature allows a single-radio AP to dynamically change its radiobandsBand refers to a specified range of frequencies of electromagnetic radiation.based on current coverage on the configuredbandBand refers to a specified range of frequencies of electromagnetic radiation.. This feature is enabled via theARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.profile used by the AP.
当你第一次提供single-radio美联社,initially operates in the radiobandBand refers to a specified range of frequencies of electromagnetic radiation.specified in its AP system profile. If the AP finds adequate coverage on multiple channels in its currentbandBand refers to a specified range of frequencies of electromagnetic radiation.of operation, thefeature allows the AP to temporarily turn itself off and become an AP Air Monitor. In AP Monitor mode, the AP scans all channels across bothbandsBand refers to a specified range of frequencies of electromagnetic radiation.to verify that each channel meets or exceeds its required level of acceptable radio coverage (as defined by the in theARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.profile).
If the AP Monitor detects that a channel on the802.11g802.11g offers transmission over relatively short distances at up to 54 Mbps, compared with the 11 Mbps theoretical maximum of 802.11b standard. 802.11g employs Orthogonal Frequency Division Multiplexing (OFDM), the modulation scheme used in 802.11a, to obtain higher data speed. Computers or terminals set up for 802.11g can fall back to speed of 11 Mbps, so that 802.11b and 802.11g devices can be compatible within a single network.bandBand refers to a specified range of frequencies of electromagnetic radiation.does not have adequate radio coverage, it will convert back to an AP on that802.11802.11 is an evolving family of specifications for wireless LANs developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE). 802.11 standards use the Ethernet protocol and Carrier Sense Multiple Access with collision avoidance (CSMA/CA) for path sharing.channel. If the802.11g802.11g offers transmission over relatively short distances at up to 54 Mbps, compared with the 11 Mbps theoretical maximum of 802.11b standard. 802.11g employs Orthogonal Frequency Division Multiplexing (OFDM), the modulation scheme used in 802.11a, to obtain higher data speed. Computers or terminals set up for 802.11g can fall back to speed of 11 Mbps, so that 802.11b and 802.11g devices can be compatible within a single network.bandBand refers to a specified range of frequencies of electromagnetic radiation.is adequately covered, the AP Monitor will next check the802.11a802.11a provides specifications for wireless systems. Networks using 802.11a operate at radio frequencies in the 5 GHz band. The specification uses a modulation scheme known as orthogonal frequency-division multiplexing (OFDM) that is especially well suited to use in office settings. The maximum data transfer rate is 54 Mbps.bandBand refers to a specified range of frequencies of electromagnetic radiation.. If a channel on the802.11a802.11a provides specifications for wireless systems. Networks using 802.11a operate at radio frequencies in the 5 GHz band. The specification uses a modulation scheme known as orthogonal frequency-division multiplexing (OFDM) that is especially well suited to use in office settings. The maximum data transfer rate is 54 Mbps.bandBand refers to a specified range of frequencies of electromagnetic radiation.lacks coverage, the AP Monitor will convert back to an AP on that802.11a802.11a provides specifications for wireless systems. Networks using 802.11a operate at radio frequencies in the 5 GHz band. The specification uses a modulation scheme known as orthogonal frequency-division multiplexing (OFDM) that is especially well suited to use in office settings. The maximum data transfer rate is 54 Mbps.channel.
80 MHz Dynamic Bandwidth Switch
If an AP radio uses an 80MHzMegahertzchannel, the radio only sends out frames when the entire 80MHzMegahertzchannel is clear, even if the AP is sending only a 20MHzMegahertzmanagement frame or 40MHzMegahertzdata frame. As a result, throughput on the selected 80MHzMegahertzchannel can be negatively impacted if interference occurs on both 20MHzMegahertzchannels of the secondary 40MHzMegahertzchannel.
TheARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.dynamic bandwidth switch feature allowsARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.to detect the 20 Mhz interferes in this situation and potentially move the AP radio to another 80MHzMegahertzchannel, or change the AP transmissions to 40MHzMegahertzand use the primary 40MHzMegahertzchannel instead.
When this feature is enabled,ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.starts a dynamic bandwidth switch observation window if load-aware scan rejects increase,andthe clear channel assignment IBSS percentage (the percentage of channel traffic sent from that AP radio) drops below the value defined by theparameter.
If an observation window opens, and the clear channel assignment interference threshold exceeds the value defined by the参数,和失败的数量从t灯塔he radio exceeds the threshold defined by theparameter during that observation period,ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.will move the AP to another available 80MHzMegahertzchannel with the minimum interference index. If no other 80MHzMegahertzchannel is available,ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.downgrades the radio bandwidth to 40MHzMegahertz.
This feature is configured using thecommand in the command-line interface. For more information refer to theArubaOSCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.Reference Guide. |
ARM Coverage and Interference Metrics
ARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.computes coverage and interference metrics for each valid channel and chooses the best performing channel and transmit power settings for each AP’sRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.environment. Each AP gathers other metrics on theirARMAdaptive Radio Management. ARM dynamically monitors and adjusts the network to ensure that all users are allowed ready access. It enables full utilization of the available spectrum to support maximum number of users by intelligently choosing the best RF channel and transmit power for APs in their current RF environment.-assigned channel to provide a snapshot of the currentRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.health state.
The following two metrics help the AP decide which channel and transmit power setting is best.
The AP uses this metric to measureRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.coverage. The coverage index is calculated as x/y, where “x” is the AP’s weighted calculation of theSNRSignal-to-Noise Ratio. SNR is used for comparing the level of a desired signal with the level of background noise.on all valid APs on a specified802.11802.11 is an evolving family of specifications for wireless LANs developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE). 802.11 standards use the Ethernet protocol and Carrier Sense Multiple Access with collision avoidance (CSMA/CA) for path sharing.channel, and “y” is the weighted calculation of the APSNRSignal-to-Noise Ratio. SNR is used for comparing the level of a desired signal with the level of background noise.the neighboring APs see on that channel.
To view these values for an AP in your currentWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.environment, issue theCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.command, whereis the name of an AP for which you want to view information.
The AP uses this metric to measure co-channel and adjacent channel interference. The Interference Index is calculated as a/b/c/d, where:
Metric value “a” is the channel interference the AP sees on its selected channel.
Metric value “b” is the interference the AP sees on the adjacent channel.
Metric value “c” is the channel interference the AP’s neighbors see on the selected channel.
Metric value “d” is the interference the AP’s neighbors see on the adjacent channel.
To manually calculate the total Interference Index for a channel, issue theCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.command, then add the valuesa+b+c+d.
Each AP also gathers the following additional metrics, which can provide a snapshot of the currentRFRadio Frequency. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz, including the frequencies used for communications or Radar signals.health state. View these values for each AP using theCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.command.
Amount of Retry frames (measured in %)
Amount of Low-speed frames (measured in %)
Amount of Non-unicast frames (measured in %)
Amount of Fragmented frames (measured in %)
带宽的通道(测量in kbps)
Amount of PHY errors seen on the channel (measured in %)
Amount ofMACMedia Access Control. A MAC address is a unique identifier assigned to network interfaces for communications on a network.errors seen on the channel (measured in %)
Noise floor value for the specified AP
