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New Member

Beacon signals and roaming


As far as i know, you can turn off the beacon signals of an AP to prevent sniffers from knowing of the presence of an AP.

What if the user is connect to AP1 and that his signal is weak, will it auto change to AP2 (stronger signal) when both AP is turned off beacon signalling?

Cisco Employee

Re: Beacon signals and roaming

APs are **not** generally configured to stop beaconing, they are often configured to not advertise their SSID in the beacons.

Not advertising the SSID is considered by many to be a form of security. However sniffers and other analyzers can still determine the SSID from probe-request and probe-response frames even with broadcast-SSID disabled.

When a Cisco client roams, it will load-balance itself to the "best" AP.

It a pretty complex algorithm, with heuristics to prevent "flapping", but client evaluates the following information from the AP before deciding which AP to use;

-- Signal strength

-- # client associations

-- AP transmitter load

-- # of repeater hops to the backbone

All of this information is contained in Cisco AP beacons even if broadcast SSID has been turned off.

New Member

Re: Beacon signals and roaming

Hi Bruce,

Do you have details technical document explaining about AP beaconing ?



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