Hello Jeen, Nice post. I have the same understanding as you. It seems you can trigger EDRRM only on those 3 thresholds low 35 (if it falls below threshold 35) , medium 50 (if it falls below 50) and high 60 (if it falls below 60) And these are all sensivity values. So that can be confusing like you said. Less sensivity less probable of doing changes. But on the other hand you can trigger traps to be sent at a custom AQI value. Under clean AIR AQI alarm threshold (1 to 100). But this seems only to be a trap and thus informational for WCS.
English is not my native language. But when there is a threshold doesn´t it always mean that this is "null" value. If something crosses this value then appropriate thing triggers ? right ? For example if asked: If AQI for a given controller goes below 35 an EDRRM should trigger a local DCA update if it improves quality. Then you shouldn´t think about setting the value 34 (even though it is not possible here) but set it to 35 or Low. people agree ? It seems you agree and also Andrew about when this happens. I nicer way to ask this question would be: "An AP reports and AQI of less than 35 should be eligible to change channels with local RRM if it improves the quality." Answer would be set EDRRM to low (and of course enable clean air on radio, access points (if disabled) A harder question would be. "Trigger an alarm if AQI value falls below the medium AQI". = aswer here would be setting the AQI Alarm trheshold to 50 (not 49) I actually learned recently that the WLC help page can come in preety handy sometimes, it gives you facts that you need for example I looked this up and there seems no doubt about my Trehshold value question. An example fro WLC help: "Select the Enable AQI (Air Quality Index) Trap check box to enable the triggering of air quality alarms, or unselect the check box to disable this feature. The default value is selected. If you selected the Enable AQI Trap check box in the step above, enter a value between 1 and 100 (inclusive) in the AQI Alarm Threshold text box to specify the threshold at which you want the air quality alarm to be triggered. When the air quality falls below the threshold level, the alarm is triggered. A value of 1 represents the worst air quality, and 100 represents the best. The default is 35." And for the EDRRM WLC help output is: "Configured sensitivity threshold setting at which the RRM is invoked. The available values are Low, Medium, or High. When the interference level of the access point raises above the threshold level, RRM initiates a local dynamic channel assignment (DCA) run and changes the channel of the affected access point radio if possible to improve performance. Low represents a decreased sensitivity to changes in the environment while High represents an increased sensitivity. The default value is Medium." regards. Kristjan ------------------------------ Message: 2 Date: Thu, 17 Jan 2013 14:19:40 +1000 From: Jeen Sern Chew <[email protected]> To: [email protected] Subject: [OSL | CCIE_Wireless] IPExpert LAB 4: Question 4.8 CleanAir EDDRM Sensitivity Message-ID: <cals5-fpf1ncgxj5owhmiigghnpwirvs-6q1n0wvprbq9w-d...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Hello all, Firstly thanks for all discussions as it is really helpful for the CCIE Wireless lab. I have only been reading on the discussions and this will be my first post. In the IPExpert workbook version 2, Lab 4, Question 4.8, the third question goes "An AP that reports an AQI of less than 40 should be eligible to change channels before the default RRM algorithm is run". The Solutions Guide mentions to use EDRRM of 'Low' sensitivity. EDRRM Sensitivity: High - 60 Medium - 50 Low - 35 The following is my understanding of the EDRRM sensitivity in terms of AQI: High: 51 - 60 Medium: 36 - 50 Low: 0 - 35 So I would think the answer is 'Medium' as 40 falls in the 36-50 AQI Andrew ( http://revolutionwifi.blogspot.com.au/2010/10/cisco-cleanair-review.html) mentions "High Sensitivity requires AQI to fall below 60, Medium Sensitivity requires AQI below 50, and Low Sensitivity requires AQI below 35." This from my point of view is the following: High: 50 - 59 Medium: 35 - 49 Low: 0 - 34 >From the WLC 7.0.116 guide under CleanAir EDRRM, "When the interference >for the access point rises above the threshold level, RRM initiates a local dynamic channel assignment (DCA) run and changes the channel of the affected access point radio if possible to improve network performance." This is a bit confusing as it mentions "interference" when we are directly dealing with "AQI". High interference means low AQI and low interference means high AQI. Usually I will just lab the scenario out to understand it but I think this is a bit hard and I don't have right equipment to create wireless interference to the precise AQI value. Is this just a typo in the Solutions Guide? Or my brain is just fried from studying too much 2 weeks prior to the lab exam? Taking the lab exam in Sydney on the 29th of January. Thanks. Regards, Jeen Sern Chew -------------- next part -------------- An HTML attachment was scrubbed... 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