Configuring TotalWatch
Aruba802.11n802.11n 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.APs and non-11n APs inAMAir Monitor. AM is a mode of operation supported on wireless APs. When an AP operates in the Air Monitor mode, it enhances the wireless networks by collecting statistics, monitoring traffic, detecting intrusions, enforcing security policies, balancing wireless traffic load, self-healing coverage gaps, and more. However, clients cannot connect to APs operating in the AM mode.-mode support for TotalWatch is the ability to scan all channels of theRFRadio 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.spectrum, including 2.4-and 5GHzGigahertz.bandsBand refers to a specified range of frequencies of electromagnetic radiation.as well as the 4.9GHzGigahertz.public safetybandBand refers to a specified range of frequencies of electromagnetic radiation.. TotalWatch also provides 5MHzMegahertzgranular channel scanning ofbandsBand refers to a specified range of frequencies of electromagnetic radiation.为流氓设备和动态扫描停顿时间to focus on those channels with traffic. TotalWatch provides an advanced set of features to detect unauthorized wireless devices and a set of customized rules are used to highlight devices that truly pose a threat to the network.
TotalWatch provides monitoring support for the entireWLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection.spectrum.ArubaAPs in theAMAir Monitor. AM is a mode of operation supported on wireless APs. When an AP operates in the Air Monitor mode, it enhances the wireless networks by collecting statistics, monitoring traffic, detecting intrusions, enforcing security policies, balancing wireless traffic load, self-healing coverage gaps, and more. However, clients cannot connect to APs operating in the AM mode.-mode can monitor the following frequencies:
2412MHzMegahertzto 2472MHzMegahertzin the 2.5GHzGigahertz.bandBand refers to a specified range of frequencies of electromagnetic radiation.
5100MHzMegahertzto 5895MHzMegahertzin the 5GHzGigahertz.bandBand refers to a specified range of frequencies of electromagnetic radiation..
ArubaAPs inAMAir Monitor. AM is a mode of operation supported on wireless APs. When an AP operates in the Air Monitor mode, it enhances the wireless networks by collecting statistics, monitoring traffic, detecting intrusions, enforcing security policies, balancing wireless traffic load, self-healing coverage gaps, and more. However, clients cannot connect to APs operating in the AM mode.-mode can scan the following additional frequencies:
2484MHzMegahertzand 4900MHzMegahertzto 5000MHzMegahertz(J-channels)
5000 to 5100MHzMegahertz
If the AP isHTHigh Throughput. IEEE 802.11n is an HT WLAN standard that aims to achieve physical data rates of close to 600 Mbps on the 2.4 GHz and 5 GHz bands.-capable, these frequencies are scanned in the 40MHzMegahertzmode.
This section includes the following topics:
Understanding TotalWatch Channel Types and Qualifiers
Based on the regulatory characteristics, channels are categorized into the following types:
: A channel that belongs to the regulatory domain of the country in which the AP is deployed. The set of channels that belong to this group is a subset of the channels in the all-reg-domain channel group.
: A valid non-overlapping channel that is in the regulatory domain of at least one country. The channels in this category belong in the frequency ranges of:
2412MHzMegahertzto 2472MHzMegahertzin the g-bandBand refers to a specified range of frequencies of electromagnetic radiation.
5100MHzMegahertzto 5895MHzMegahertzin the a-bandBand refers to a specified range of frequencies of electromagnetic radiation..
: Channels that fall into a frequency range outside of the regulatory domain; 2484MHzMegahertzand 4900MHzMegahertz-4995MHzMegahertz(J-channels), and 5000-5100MHzMegahertz. The channels in this group do not belong to any other group.
Each of these channel types can have an associated qualifier:
: This qualifier indicates that wireless activity is detected on this channel by the presence of an AP or other802.11802.11 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.activity such as a probe request.
: A channel where wireless containment is active. This channel should belong to the country-code channel (regulatory domain).
Understanding TotalWatch Monitoring Features
TotalWatch enables monitoring of all channels including regulatory domain and rare channels. You can select one of the following scanning modes for each radio AP:
scan only the channels that belong to the AP’s regulatory domain
scan channels that belong to all regulatory domains
scan all channels
Understanding TotalWatch Scanning Spectrum Features
TotalWatch scans the following frequencies.
G -bandBand refers to a specified range of frequencies of electromagnetic radiation.—2412MHzMegahertzto 2472MHzMegahertz
J-bandBand refers to a specified range of frequencies of electromagnetic radiation.—2484MHzMegahertzand 4900-4995MHzMegahertz
A-bandBand refers to a specified range of frequencies of electromagnetic radiation.—5000-5100MHzMegahertzto 5895MHzMegahertz
Table 1list the frequency-to-channel mapping used by TotalWatch.
Frequency |
Channel |
2412 – 2472MHzMegahertz(in increments of 5MHzMegahertz) |
1 - 13 |
2484MHzMegahertz |
14 |
5100 – 5895MHzMegahertz(in increments of 5MHzMegahertz) |
20 - 179 |
4900 – 4995MHzMegahertz(in increments of 5MHzMegahertz) |
180 - 199 |
5000 – 5100MHzMegahertz |
200 - 219 |
Understanding TotalWatch Channel Dwell Time
When an AP (in am-mode) visits a channel, the amount of time the AP stays on that channel is known as the dwell time. The channel dwell time is a variable value based on the following channel types.
: For channels where there is wireless activity. Default setting is 500 ms.
: For channels that belong to the AP’s regulatory domain group (reg-domain) with no wireless activity. The default setting is 250 ms.
: For channels that belong to the all regulatory domain group (all-reg-domain) with no wireless activity The default setting is 250 ms.
: For channels in the rare group where no wireless activity is detected. The default value is 100 ms.
Use thecommand to set the dwell time and scan mode.
Understanding TotalWatch Channel Visiting
The Active and DOS channels are visited more frequently than the other channels. The order of preference in selecting the next channel is:
1.DOS
2.Active
3.reg-domain
4.All-reg-domain
5.Rare
一旦选择一个通道,住的时间that channel is determined based on the channel type. At the end of the dwell time, a new channel is picked.
Understanding TotalWatch Age out of Devices
ArubaOSuses a combination of inactivity time and unseen time to age out a device. This ensures that the channel is scanned a sufficient number of times before a device ages out.AMAir Monitor. AM is a mode of operation supported on wireless APs. When an AP operates in the Air Monitor mode, it enhances the wireless networks by collecting statistics, monitoring traffic, detecting intrusions, enforcing security policies, balancing wireless traffic load, self-healing coverage gaps, and more. However, clients cannot connect to APs operating in the AM mode.module maintains the following parameters:
: The absolute time, in seconds, since the device was discovered.
: The number of times the channel was scanned since discovery.
: The number of times the device was not seen when the channel is scanned.
: The absolute time, in seconds, since the device was last seen.
