802.11a Global Parameters > Auto RF
Use WIRELESS > Global RF > 802.11a Network andthen click Auto RF button to navigate to this page.
Use this page to edit the Auto RF characteristics.
Table 5-38 RF Group
Parameter Description
Group Mode Dynamic grouping has two modes: Enabled and Disabled. When the grouping is Disabled, no dynamic grouping occurs. Each controller optimizes only its own access point parameters. When grouping is Enabled, the controller forms groups and elects leaders to perform better dynamic parameter optimization.
Group Update Interval When grouping is on, this interval (in seconds) represents the period with which the grouping algorithm is run by the Group Leader. Grouping algorithm also runs when the group contents changes and the automatic grouping is enabled. A dynamic grouping can be started upon request from the system administrator. Default value is 3600 seconds. Group Leader This is the MAC address of the group leader for the group containing
this controller. Is this Controller Group
Leader?
Yes this controller is the group leader or No the controller is not the group leader.
Last Group Update The elapsed time since the last group update in seconds. This is only valid if this controller is a group leader.
Chapter 5 Wireless Menu Bar Selection 802.11a Global Parameters
Table 5-39 RF Channel Assignment Parameter Description
Channel Assignment Method Dynamic channel assignment has three modes.
• Automatic - The channel assignment is periodically updated for all access point that permit this operation.
• On Demand - Channel assignments are updated when the
Invoke Channel Update Now button is clicked.
• OFF - No dynamic channel assignments occur and value are set to their global default.
Default is Automatic.
Avoid Foreign AP Interference Enabled or Disabled. Enable this Radio Resource Management (RRM) foreign 802.11 interference-monitoring parameter to have Radio Resource Management consider interference from foreign (non-Cisco access point outside the RF/mobility domain) access points when assigning channels to Cisco access points. Disable this parameter to have Radio Resource Management ignore this interference.
In certain circumstances with significant interference energy (dB) and load (utilization) from Foreign APs, Radio Resource
Management may adjust the channel assignment to avoid these channels (and sometimes adjacent channels) in access points close to the Foreign APs to increase capacity and reduce variability for the Cisco WLAN Solution.
Avoid Cisco AP Load Enabled or Disabled. Enable this Radio Resource Management (RRM) bandwidth-sensing parameter to have controllers consider the traffic bandwidth used by each access point when assigning channels to access point. Disable this parameter to have Radio Resource Management ignore this value.
In certain circumstances and with denser deployments, there may not be enough channels to properly create perfect channel re-use. In these circumstances, Radio Resource Management can assign better re-use patterns to those access points that carry more traffic load. Avoid non-802.11a Noise Enabled or Disabled. Enable this Radio Resource Management
(RRM) noise-monitoring parameter to have access points avoid channels that have interference from non-Access Point sources, such as microwave ovens or Bluetooth devices. Disable this parameter to have Radio Resource Management ignore this interference.
In certain circumstances with significant interference energy (dB) from non-802.11 noise sources, Radio Resource Management may adjust the channel assignment to avoid these channels (and sometimes adjacent channels) in access points close to the noise sources to increase capacity and reduce variability for the Cisco WLAN Solution.
Chapter 5 Wireless Menu Bar Selection
802.11a Global Parameters
Signal Strength Contribution Always Enabled. Radio Resource Management (RRM) constantly monitors the relative location of all access points within the RF/mobility domain to ensure near-optimal channel re-use. The net effect is an increase in Cisco WLAN Solution capacity and a reduction in co-channel and adjacent channel interference. Channel Assignment Leader MAC address of the channel assignment leader. In Cisco WLAN
Solution Mobility Groups or Cisco WLAN Solution WPS Groups, this is the MAC address of the Group leader.
Last Channel Assignment Last time the Radio Resource Management (RRM) evaluated the current channel assignment. This occurs on a periodic basis. This does not imply that channels have changed, only that the Radio Resource Management has made an evaluation of the current assignment.
Table 5-40 Tx Power Level Assignment Parameter Description
Power Level Assignment Method
Dynamic transmit power assignment has three modes.
Automatic - The transmit power is periodically updated for all access points that permit this operation.
On Demand - Transmit power is updated when the Invoke Power Update Now button is clicked.
Fixed - No dynamic transmit power assignments occur and value are set to their global default.
Default is Automatic.
Power Threshold These read-only parameters are used to fine tune the power control. The transmit power control is trying to limit power so that at most <neighbor count> access points receive the signal of each access point above a <power threshold>.
Power Neighbor Count
Power Update Contribution This read-only field displays the factors used for changing power level assignments. The factors are:
L (Load) S (Signal) N (Noise) I (Interference)
For each factor listed, the corresponding measurement is used in the power assignment algorithm.
Power Assignment Leader MAC address of the power level assignment leader.
Last Power Level Assignment The elapsed time since the last transmit power assignment in seconds.
Table 5-39 RF Channel Assignment (continued) Parameter Description
Chapter 5 Wireless Menu Bar Selection 802.11a Global Parameters
Use Set to Factory Default to set all Auto RF 802.11a parameters to the Factory Defaults.
Command Buttons
• Back: Return to the previous window.
• Apply: Data is sent to the controller and made to take effect, but not preserved across a power cycle; these parameters are stored temporarily in volatile RAM.
• Help: Request that the help page be displayed in a new browser window.
Table 5-41 Profile Thresholds
Parameter Description
Interference (0 to 100%) Foreign 802.11a interference threshold between 0 and 100 percent. Clients (1 to 75) Client threshold between 1 and 75 clients.
Noise (-127 to 0 dBm) Foreign noise threshold between -127 and 0 dBm. Coverage (3 to 50 dBm) 802.11a coverage threshold between 3 and 50 dB.
Utilization (0 to 100%) 802.11a RF utilization threshold between 0 and 100 percent. Coverage Exception Level
(0 to 100%)
Coverage exception level between 0 and 100 percent.
Data Rate (1 to 1000 Kbps) 802.11a throughput threshold between 1 Kbps and 1000 Kbps. Client Min Exception Level
(1 to 75)
Client minimum exception level.
Table 5-42 Monitor Intervals
Parameter Description
Noise Measurement The interval (in seconds) for noise and interference measurements at each access point. Default is 300 seconds.
Load Measurement The interval (in seconds) for load measurements at each access point. Default is 300 seconds.
Signal Measurement The interval (in seconds) for strength measurements at each access point. Default is 300 seconds.
Coverage Measurement The interval (in seconds) for coverage measurements at each access point. Default is 300 seconds.
Chapter 5 Wireless Menu Bar Selection