Cisco Cisco 5520 Wireless Controller Referencia técnica
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Radio Resource Management–Radio Frequency Grouping Algorithm
RRM Data Collection Activities
RRM Data Collection Activities
The RRM processes collect data so that it can be used in organizing RRM. The data collected through
the processes is also used for processing channel and power selections for connected APs. A base
understanding of where and how RRM gets its information and why it is essential to understand the
algorithms involved is required. The process of how and where to configure monitoring tasks and what
these translate to in an operational environment will be covered in this section. For each RRM algorithm
discussed, the data used and how it is used will also be covered in this discussion.
the processes is also used for processing channel and power selections for connected APs. A base
understanding of where and how RRM gets its information and why it is essential to understand the
algorithms involved is required. The process of how and where to configure monitoring tasks and what
these translate to in an operational environment will be covered in this section. For each RRM algorithm
discussed, the data used and how it is used will also be covered in this discussion.
The channel list to be monitored is configured under Wireless > 802.11a/b > RRM > General >
Noise/Interference/Rogue/CleanAir Monitoring channels
Noise/Interference/Rogue/CleanAir Monitoring channels
From the Channel List drop-down list, choose one of the following options to specify the set of channels
that APs will use for RRM scanning:
that APs will use for RRM scanning:
1.
All Channels—RRM channel scanning occurs on all channels supported by the selected radio, which
includes channels not allowed in the country of operation. (Passive only)
includes channels not allowed in the country of operation. (Passive only)
2.
Country Channels—RRM channel scanning occurs only on the data channels in the country of
operation. This is the default value.
operation. This is the default value.
3.
DCA Channels—RRM channel scanning occurs only on the channel set used by the DCA algorithm,
which by default includes all of the non-overlapping channels allowed in the country of operation.
However, you can specify the channel set to be used by DCA if desired.
which by default includes all of the non-overlapping channels allowed in the country of operation.
However, you can specify the channel set to be used by DCA if desired.
Two types of off-Channel events are defined:
1.
Passive Dwell–It is used to detect Rogues and collect noise and interference metrics. The dwell time
is 50 ms.
is 50 ms.
2.
Neighbor Discovery Protocol Tx–It is used to send NDP messages from all channels supported for
transmit by the radio. For All Channels, this will be the same as Country Channels.
transmit by the radio. For All Channels, this will be the same as Country Channels.