HPE IMC WSM Spectrum Guard Configuration Examples

HPE IMC WSM Spectrum Guard Configuration Examples
HPE IMC
WSM Spectrum Guard Configuration
Examples
Part number: 5200-1396
Software version: IMC WSM 7.2 (E0502P04)
The information in this document is subject to change without notice.
© Copyright 2016, Hewlett Packard Enterprise Development LP
Contents
Introduction ·····················································································1
Prerequisites ···················································································1
Configuration restrictions and guidelines ···············································1
Example: Using spectrum guard to monitor a WLAN ································1
Network requirements ··················································································································· 1
Requirements analysis ·················································································································· 2
Software version used··················································································································· 2
Setting the operating mode for the monitor AP ··················································································· 2
Configuring spectrum analysis ········································································································ 3
Enabling spectrum analysis globally ·························································································· 3
Enabling spectrum analysis for a radio ······················································································ 6
Enabling FFT monitoring ········································································································· 6
Configuring channels to be monitored ······················································································· 7
Viewing the spectrum guard result ··································································································· 8
Viewing spectrum analysis monitoring data ················································································ 8
Recording spectrum analysis monitoring data ··········································································· 12
Viewing spectrum analysis monitoring history ··········································································· 14
Viewing the current interference list ························································································ 15
Viewing interference history ·································································································· 16
Viewing the AP channel quality list·························································································· 17
Viewing interference alarms ·································································································· 17
i
Introduction
This document provides examples for using spectrum guard to monitor WLANs.
Spectrum guard monitors frequency bands to detect interference and evaluate channel quality.
Administrators can obtain the wireless spectrum performance and WLAN security status by viewing
realtime spectrum data and history monitoring files.
Prerequisites
Before you use the spectrum guard module to monitor a WLAN, complete the following tasks:

Create a WLAN to be monitored. Make sure the routes are reachable.

Add wireless devices to WSM.

Register the spectrum analysis license on the AC.

Enable spectrum analysis on the monitor AP.

Register the spectrum guard license on the WSM server.
Configuration restrictions and guidelines
When you use spectrum guard, follow these restrictions and guidelines:

For better realtime spectrum analysis performance, configure the monitor AP to operate in
monitor mode. In normal mode, the AP detects only the working channel. In hybrid mode, the AP
detects all channels and provides wireless services at the same time.

Spectrum guard supports only Comware-based devices.
Example: Using spectrum guard to monitor
a WLAN
Network requirements
As shown in Figure 1, configure AP1 and AP2 to operate in normal mode to provide wireless services.
Configure the monitor AP to operate in monitor mode. Enable spectrum analysis on the monitor AP to
detect interference on the WLAN in an office building.
1
Figure 1 Network diagram
Requirements analysis
To use spectrum guard to monitor a WLAN, complete the following tasks:
1.
Configure the monitor AP to collect spectrum data.
2.
Enable spectrum analysis and interference detection, and enable the alarm function and
configure alarm trigger conditions.
3.
View spectrum analysis data to discover interference and evaluate channel quality.
Software version used
This configuration example was created and verified on the following software versions:

IMC PLAT 7.2 (E0403P03).

IMC WSM 7.2 (E0502P04).
Setting the operating mode for the monitor AP
1.
Log in to IMC.
2.
Click the Service tab.
3.
From the navigation tree, select WLAN Manager > Resource Management > Fit APs.
2
The Fit AP List page appears.
4.
Click the label of the target monitor AP. In this example, click the label ap43.
The fit AP details page appears.
5.
In the Action area located on the right of the page, click Modify AP Template.
The Modify AP Template page appears.
6.
Select Monitor from the Work Mode list, as shown in Figure 2.
Figure 2 Setting the operating mode
7.
Click OK.
NOTE:
 To switch between the hybrid mode and monitor mode, first change the operating mode to
normal mode.
 To view the Signal Strength by SSID statistics, set the AP to operate in monitor mode.
Configuring spectrum analysis
To make spectrum analysis take effect on a radio, enable spectrum analysis both globally and on the
radio.
Enabling spectrum analysis globally
Configure global spectrum analysis settings for the 2.4 GHz band and 5 GHz band separately.
To enable spectrum analysis globally:
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard.
The Spectrum Guard page appears.
3.
Select an AC from the Device Configuration list. In this example, select the AC named
WX6103_1.
3
4.
Click Spectrum Analysis Configuration.
The Spectrum Analysis Configuration page for the 2.4 GHz band appears.
5.
Configure the following parameters for the 2.4 GHz band, as shown in Figure 3:







Select Enable from the Spectrum Analysis list.
Select the type of devices to detect from the Select interferences list as needed. In this
example, select Microwave Oven, Bluetooth, and Cordless Phone.
Select Enable from the Interference Alarm list. Then, the AC sends alarms to IMC when the
radio detects interference or when the interference disappears.
Select the types of interference devices for which alarms are generated from the Select
interferences list as needed. In this example, select Microwave Oven, Bluetooth, and
Cordless Phone.
Select Enable from the Channel Quality Alarm list. Then, the AC sends alarms to IMC when
the channel quality is lower than the specified threshold.
Enter 35 in the Channel Quality Alarm Threshold field.
Select Enable from the Automatic Channel Selection list. Then, channel adjustment is
triggered on the AC when the quality of the current working channel is lower than the specified
threshold.
When the quality of the current channel drops below the threshold, the AC selects a new
channel for the AP. However, the AP does not use the new channel until the channel quality
difference between the new and old channels exceeds the tolerance level.
To enable automatic channel selection, make sure the AC uses automatic channel selection
and channel lock is disabled.

Select Medium from the Sensitivity Level list. The higher the sensitivity level, the higher the
channel switchover frequency.
4
Figure 3 Setting spectrum analysis parameters for the 2.4 GHz band
6.
Click OK.
7.
Click the 5GHz tab to configure parameters for the 5 GHz band, as shown in Figure 4.
Configure the 5 GHz band in the same way the 2.4 GHz band is configured, except for the types
of interference that can be detected.
5
Figure 4 Setting spectrum analysis parameters for the 5 GHz band
8.
Click OK.
Enabling spectrum analysis for a radio
To detect interference or monitor channel quality of an AP, first enable spectrum analysis for the radio
on the AP.
To enable spectrum analysis for a radio:
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard > Radio Config.
The Radio Config page appears.
3.
Select the radio for which you want to enable spectrum analysis. In this example, enable
spectrum analysis for the radio with the ID of 2 on the AP with the label ap43.
4.
Click Enable Analysis.
The Result List page shows the operation result for the radio.
5.
Click Back to return to the Radio Config page.
Enabling FFT monitoring
To monitor, record, or save FFT, FFT duty cycle, or swept spectrogram data, you must first enable FFT
monitoring.
6
To enable FFT monitoring:
1.
Select the radio for which FFT monitoring is to be enabled on the Radio Config page.
2.
Click Enable FFT.
The Result List page shows the operation result for the radio.
3.
Click Back to return to the Radio Config page.
Configuring channels to be monitored
1.
Select the radios for which you want to configure channel monitoring on the Radio Config page.
2.
Click Monitor Channels.
The Monitor Channels window appears.
3.
Select the channel range as needed, as shown in Figure 5.
Applicable channel ranges vary by regions. For the 2.4 GHz band, only the default channel range
1-14 is available. For the 5 GHz band, select 36-64, 100-140, or 149-165 from the Channel list.
Figure 5 Selecting the channel range
4.
Click OK.
The Radio Config page displays the configuration result, as shown in Figure 6.
Figure 6 Configuration result
7
Viewing the spectrum guard result
The spectrum guard result enables you to locate interference on the WLAN to eliminate the interference
and ensure correct operation of the WLAN.
Viewing spectrum analysis monitoring data
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard > Radio Config.
The Radio Config page appears.
3.
Click the Operation icon
from the shortcut menu.
for the interference, and then select Spectrum Analysis Monitor
The Spectrum Analysis Monitor window appears.
4.
Configure the following monitoring parameters:


Select the radio used to monitor channels.
Select a maximum of four types of spectrum analysis monitoring information. Options are
Channel Usage, Channel Usage Trend, Channel Quality, Channel Quality Trend,
Interference Signal Strength, FFT, FFT Duty Cycle, Swept Spectrogram, and Signal
Strength by SSID, as shown in Figure 7:
Figure 7 Statistics

5.
Click OK.
Click Monitor.
Realtime spectrum monitoring starts. The spectrum monitoring data is refreshed every 6 seconds.
Table 1 provides the spectrum monitoring charts.
8
Table 1 Spectrum monitoring charts
Item
Description
Channel usage bar chart
Displays the usage of each channel and the channel resource
assignment of each channel.
Channel usage trend graph


Helps administrators determine the time range during which
interference or traffic congestion occurs to locate problems.
To configure channels to be monitored, click the Configure icon
on the right of the trend graph.
Channel quality chart


Higher channel quality indicates higher performance of wireless
devices.
You can assign channel resources based on channel quality.
9
Item
Description
Channel quality trend graph


Provides channel quality data to help administrators assign
channels.
To configure channels to be monitored, click the Configure icon
on the right of the trend graph.
Interference signal strength graph
Displays interference distribution and signal strength on different
channels. This helps administrators plan channel resources.
10
Item
Description
FFT chart




Displays the spectrum on the frequency. Administrators can
locate interference and obtain the interference features such as
the bandwidth, frequency-hopping spread spectrum, spread
spectrum, and swept spectrogram.
FFT—Realtime interference signal strength on the frequency.
Max—Maximum interference signal strength on the frequency.
Avg—Average interference signal strength on the frequency.
FFT Duty Cycle (%) graph




Displays percentage of the time that interference is present in
the channel. This helps administrators evaluate interference
severity.
Duty Cycle—Duty cycle of interference signals on the
frequency.
Max Hold—Maximum duty cycle of interference signals on the
frequency.
Max of last 10 Sweep—Maximum duty cycle of interference
signals on the frequency over the most recent 10 sweeps.
11
Item
Description
Swept Spectrogram graph
The Swept Spectrogram graph combines a time- and frequencybased view of the RF spectrum to help you analyze interference
features.
Signal strength by SSID graph
Displays SSID distribution and signal strength on different channels.
Recording spectrum analysis monitoring data
To record the monitoring data of FFT, FFT duty cycle, or swept spectrogram:
1.
In the Spectrum Analysis Monitor window, click the Start Recording icon
of the graph, as shown in Figure 8.
12
at the upper right
Figure 8 Starting recording
2.
At the upper right of the graph, click the Stop Recording icon
, as shown in Figure 9.
Figure 9 Stopping recording
3.
At the upper right of the graph, click the Save Recordings icon
13
, as shown in Figure 10.
Figure 10 Saving recordings
The monitoring data is saved in a .csv file.
Viewing spectrum analysis monitoring history
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard.
The Spectrum Guard page appears.
3.
In the AP Spectrum Analysis area, click Spectrum Analysis Monitor History.
The Spectrum Analysis Monitor History window appears.
4.
5.
Configure the following parameters:

Select FFT from the Statistics list.

Click Select File to select the saved .csv file.

Set the start time in the Start Time field.

Set the end time in the Stop Time field.
Click Query.
The graph displays the data in the specified time period, as shown in Figure 11.
14
Figure 11 Viewing spectrum analysis monitoring history
6.
Click Close.
Viewing the current interference list
Administrators can obtain parameters of interference to clear interference by viewing and locating
current interference.
To view the current interference list:
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard > Interferences.
The Interferences page appears.
3.
Click Synchronize.
4.
Open the Interferences page again after synchronization.
The Current Interference List displays all interference, as shown in Figure 12.
Figure 12 Current interference list
Current interference list:

Sensitivity—Severity level of the interference. A higher value indicates a higher interference.

RSSI—Signal strength of the interference.
15


5.
Duty Cycle (%)—Percentage of time during which the RSSI of the interference exceeds the
threshold.
Affected Channel—Channel affected by the interference.
Click the Operation icon
for the interference, and then select View Topology from the
shortcut menu, as shown in Figure 13.
Figure 13 Locating interference in the topology
6.
View the result, as shown in Figure 14.
The interference is located and then highlighted in the topology. In this example, the located
interference is Bluetooth.
Figure 14 Located interference
Viewing interference history
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard > Interfere Data.
The Interfere Data page appears, as shown in Figure 15.
16
Figure 15 Interference Data page
Viewing the AP channel quality list
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Spectrum Guard > Channel Quality.
The Channel Quality page appears.
3.
Click Synchronize.
4.
Open the Channel Quality page again after synchronization.
The Channel Quality page displays all channel quality, as shown in Figure 16.
Channel quality list:



Average Quality—Average score of the channel assessment. A greater value indicates a
better quality.
Worst Quality—Lowest quality score of the channel.
Noise Floor—Noise floor of the radio in dBm. Noise floor affects channel quality and changes
with the temperature.
Figure 16 Channel quality list
Viewing interference alarms
1.
Click the Service tab.
2.
From the navigation tree, select WLAN Manager > Wireless Service Alarm.
You can view an interference alarm on the alarm list, as shown in Figure 17.
17
Figure 17 Interference alarm
18
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