Wireless Access

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Contributor II

RF Neighbors

Hello, 

 

I have a 5 story dorm building with AP dense deployment. (1) AP-325 for each dorm room. Each dorm room accomodate 4 students. Per floor we have 26 rooms. On avg we have 26 AP per floor. 

 

When i check the RF neighbors of an AP it seems the AP have too many neighbors. The neighbors are in a different channel (5Ghz) but in the 2.4 Ghz (we have to re-use channels). 

 

#show ap arm neighbors ap-name Commons_202 . (2nd Floor AP #2) 

 

ARM Neighbors
-------------
bssid essid channel snr tx-power PL (dB) AP Flags Last Update (Total updates)
----- ----- ------- --- -------- ------- -------- ---------------------------
a8:bd:27:31:00:90 1NSU 48 34 18 94 Active 2017-05-02 12:44:03(277237
a8:bd:27:2f:f7:70 1NSU 161 43 18 86 Active 2017-05-02 12:43:35(100560
a8:bd:27:31:01:d0 1NSU 153 30 13 79 Active 2017-05-02 12:42:26(36545)
a8:bd:27:30:f5:50 1NSU 149 34 18 92 Active 2017-05-02 12:43:56(51756)
a8:bd:27:31:23:30 1NSU 149 19 13 89 Active 2017-05-02 12:42:23(54712)
a8:bd:27:31:25:b0 1NSU 36 36 18 92 Active 2017-05-02 12:42:15(82719)
a8:bd:27:31:01:b0 1NSU 40 22 13 85 Active 2017-05-02 12:41:59(36495)
a8:bd:27:30:0c:f0 1NSU 153 26 18 100 Active 2017-05-02 12:42:37(91899)
a8:bd:27:31:25:a0 1NSU 1 46 9 62 Active 2017-05-02 12:44:09(16171)
a8:bd:27:2f:f7:62 GUEST 11 45 2 54 Passive
a8:bd:27:2f:f7:61 NSU 11 45 2 54 Passive
a8:bd:27:2f:f7:60 1NSU 11 45 2 55 Active 2017-05-02 12:44:04(7342)
a8:bd:27:31:28:a0 1NSU 11 12 2 85 Active 2017-05-01 19:48:40(871)
a8:bd:27:31:1a:40 1NSU 11 15 2 82 Active 2017-05-02 12:06:49(3155)
6c:f3:7f:ba:33:60 GUEST 11 5 9 99 Active 2017-05-02 11:06:44(739)
a8:bd:27:31:23:20 1NSU 11 24 2 73 Active 2017-05-02 09:08:20(1577)
a8:bd:27:31:00:c1 NSU 11 17 5 83 Passive
a8:bd:27:31:00:c0 1NSU 11 17 5 84 Active 2017-05-02 12:43:42(2628)
a8:bd:27:31:00:c2 GUEST 11 17 5 84 Passive
a8:bd:27:30:fc:a2 GUEST 11 5 5 95 Passive
6c:f3:7f:b8:6e:a0 GUEST 11 5 9 100 Active 2017-05-02 12:04:50(371)
a8:bd:27:30:fc:a1 NSU 11 5 5 94 Passive
6c:f3:7f:b8:6e:a2 NSU 11 5 9 98 Passive
6c:f3:7f:ba:33:62 NSU 11 5 9 100 Passive
a8:bd:27:30:ff:62 GUEST 6 16 5 86 Passive
a8:bd:27:31:23:22 GUEST 11 24 2 73 Passive
a8:bd:27:31:23:21 NSU 11 25 2 71 Passive
a8:bd:27:31:1a:42 GUEST 11 15 2 82 Passive
a8:bd:27:31:1a:41 NSU 11 15 2 82 Passive
a8:bd:27:31:01:a0 1NSU 1 17 5 82 Active 2017-05-02 11:58:23(1794)
a8:bd:27:30:0c:e0 1NSU 1 25 2 74 Active 2017-05-02 12:37:26(637)
a8:bd:27:31:2a:51 NSU 157 12 13 97 Passive

 

The access point have at least 6 neighbors with high SNR. The power is set for 5Ghz (9 to 18) and for 2.4Ghz (6 to 9). Should i enable Mode Aware Arm in the 2.4Ghz to disable some 2.4 radios? I checked the channel utilization several times during the day and there is no major issues. 

 

The 2nd Floor Access Point is able to hear 1 AP in the 1st Floor, 3 AP in the second Floor, and two AP in the 3rd Floor. My concern is the student's device will bounce between APs or Roam, even if there is an AP in the room. 

 

Thank you 

Nils. 

 

Re: RF Neighbors

How do you have the power levels configured under the ARM profile?

Do you guys conducted a post wireless survey ?

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Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Contributor II

Re: RF Neighbors

The power levels in the arm profile are configured as:

5Ghz 

(min 9 max 18 dBm)

 

2.4Ghz

(Min 6 max 9 dBm)

 

Student are currently finishing exams, we are planning to conduct a survey next week. 

 

The issues reported were: random disconnects and slowness roaming using mobile devices.

 

1. I verified the DHCP pool and we are not running out of ip addresses. Lease time is set to 1 hr. 

 

2. I verified the VAP settings and dont see any misconfiguration. Low data rates are uncheked, client match disable, channel spectrum load balancing disable, band stearing disable, drop BC/MC is enable. 

 

3. We are using Clearpass as the authentication server. From the controller there is 140ms response time. 

 

We recently migrated from AP-135 to AP-325 and using code 6.4.4.8 

 

Thank you Victor.

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