There are two main methods used in active surveys: When a client is associated, it performs all the tasks that a typical 802.11 client performs, which includes rate-shift data rates as the RF condition changes and performs retransmissions.Īctive surveys are commonly used for new WLAN deployments because they provide the most details upon which to base a design. Active SurveyĪctive surveys are performed with the survey client associated to the APs used throughout the survey. PHY rates can only be measured by actual data that is sent to and from an AP. A passive survey only reports signal propagation for beacons measured by particular clients.
PHY rates are generally based on RF signal and noise levels. The most significant loss of information with passive surveys is uplink information, Physical (PHY) rate boundaries, and retransmission. These can be accomplished with a passive survey:
Such surveys can be helpful when you look for rogue devices or want a good gauge of downlink RF coverage from the infrastructure devices. The survey client never associates to the access point (AP). Passive surveys are performed with a listen-only mode. There are three types of surveys: Passive, Active, and Predictive. Refer to Cisco Technical Tips Conventions for information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.
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This document is not restricted to specific software and hardware versions. Prerequisites RequirementsĬisco recommends knowledge of these topics:
The purpose of this document is to provide guidelines for proper planning, preparation, and identification of the key items to check through the analysis of a survey report. It has been discovered that many site surveys are not performed properly or the site survey is omitted altogether. Many issues can arise in a wireless network due to poor planning and coverage. The first step in a wireless LAN (WLAN) deployment is to ensure that desired operation begins with a site survey to assess the Radio Frequency (RF) behavior in a specific environment. This document describes site survey guidelines for WLAN deployment.
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