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off-channel scanning

Nigrofasciatum
Level 1
Level 1

‎04-04-2011 09:58 AM - edited ‎07-03-2021 08:02 PM

Hi

I want to minimize the time in which the APs remain off-channel scanning rogues and interferences, in order to improve performance.

Currently the parameter "Scan Defer Time (msecs)" I have it set to 100. What is the optimal value? Since this parameter is modified on each WLAN, can I leave it enabled on only one of them, considering I have 3 SSIDs configured on all the APs?

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Nicolas Darchis
Cisco Employee
Cisco Employee

‎04-04-2011 10:14 PM

explanation is here : http://www.cisco.com/en/US/docs/wireless/controller/7.0/configuration/guide/c70rrm.html#wp1320230

This is only to defer off-channel scanning if a QoS frame was received. So it defers it for all SSIDs (AP is using the same radio for all SSIDs) but it only defers it for the msec given in that WLAN config when a QoS frame is received in that WLAN you configured.

Apart from a very-demanding QoS environment, you shouldn't need to postpone offchannel scanning too much.

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