Wireless Access

Reply
Contributor II
Posts: 55
Registered: ‎03-03-2011

Removing channel 1 from 2.4?

We are having an issue with one of our residence buildings (16 floors, old hotel converted) that we are seeing a lot of access points from a condo building next door with way too many DSL routesr all on channel 1.  Our channel busy is very 'busy' on channel 1 so we are considering removing channel 1 and just keeping channels 6 and 11 to improve performance.

 

About 45% of our clients are on 2.4ghz and 55% are on 5ghz, and this building has 162 APs (all AP65s so no 802.11n).

 

Has anyone else had a situation like this?  If so what did you do to mitigate the situation?

MVP
Posts: 4,307
Registered: ‎07-20-2011

Re: Removing channel 1 from 2.4?

 

That could potentially create more issues since the APs only have 2 channels to work with , how far are those other APs ?

 

What's the current min/max power levels under ARM for .11g

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Contributor II
Posts: 55
Registered: ‎03-03-2011

Re: Removing channel 1 from 2.4?

The other APs are across the street in a high rise, see attached street view, building on the right is our building, building on the left is the condo.

 

The power levels are set Min 9, Max 15

 

https://maps.google.ca/maps?ll=45.510572,-73.575976&spn=0.011759,0.014484&t=m&z=16&layer=c&cbll=45.510616,-73.576091&panoid=oZdF15EaTEEMIW9pBD_hOw&cbp=12,312.29,,0,-13.6

Contributor II
Posts: 55
Registered: ‎03-03-2011

Re: Removing channel 1 from 2.4?

Here are the neighbors on one of my worst APs, it has a channel busy of 80%, you can see a lot of neighbors on channel 1

 

 

ARM Neighbors
-------------
bssid              essid                            channel  rssi  tx-power  PL (dB)  AP Flags  Last Update (Total updates)
-----              -----                            -------  ----  --------  -------  --------  ---------------------------
00:0b:86:4a:92:60  rez.mcgill.ca                    11       20    12        89       Active    2014-01-14 13:19:14(705)
00:0b:86:4a:e4:20  rez.mcgill.ca                    1        19    12        90       Active    2014-01-14 13:24:48(1257)
00:0b:86:4a:95:00  rez.mcgill.ca                    1        20    9         81       Active    2014-01-14 12:45:29(430)
d8:6c:e9:2b:b9:c1  BELL-249                         1        11    0         0        Passive
c4:09:38:01:12:0b  CIK0792                          1        12    0         0        Passive
00:0b:86:4a:95:01  wpa.rez.mcgill.ca                1        22    9         0        Passive
b8:c7:5d:0a:80:9d  RVZ                              1        21    0         0        Passive
2c:e4:12:a2:d7:1f  BELL181                          1        14    0         0        Passive
00:0b:86:4a:8b:81  wpa.rez.mcgill.ca                1        9     12        97       Passive
2c:e4:12:94:bf:ed  fenur                            1        13    0         0        Passive
2c:e4:12:8b:37:37  BELL699                          1        13    0         0        Passive
4c:17:eb:db:c4:d3  Avish                            1        14    0         0        Passive
68:15:90:3e:66:62  BELL536                          1        12    0         0        Passive
00:0b:86:4a:8b:80  rez.mcgill.ca                    1        10    12        99       Passive
2c:e4:12:8d:82:47  BELL108                          1        14    0         0        Passive
00:01:8e:f3:92:d9  logitec2nd71                     1        6     0         0        Passive
2c:44:fd:d1:c4:10  HP-Print-10-Deskjet 3510 series  1        4     0         0        Passive
d8:6c:e9:28:23:dd  BELL637                          1        6     0         0        Passive
d8:6c:e9:12:65:1f  BELL988                          1        9     0         0        Passive
34:ef:44:fb:92:a9  BELL832                          1        3     0         0        Passive
00:01:8e:f3:92:d8  logitec71                        1        1     0         0        Passive
2c:e4:12:98:a0:eb  BELL205                          2        12    0         0        Passive
2c:e4:12:8c:00:cf  BELL366                          1        3     0         0        Passive
2c:e4:12:94:fa:ed  BELL630                          1        22    0         0        Passive
2c:e4:12:82:b4:35  BELL846                          1        16    0         0        Passive
2c:e4:12:a8:e1:1d  BELL703                          1        6     0         0        Passive
d8:6c:e9:18:3a:d1  BELL682                          1        4     0         0        Passive
2c:e4:12:8f:1a:7d  BELL428                          1        5     0         0        Passive
d8:6c:e9:0f:32:d2  Byron                            1        6     0         0        Passive
00:0b:86:4a:cb:e0                                   11       0     9         85       Active    2014-01-14 13:18:08(13)
d8:6c:e9:29:8e:d5  BELL781                          1        6     0         0        Passive
00:0b:86:4a:70:40  rez.mcgill.ca                    1        11    12        97       Active    2014-01-14 12:54:34(6)
58:6d:8f:e0:67:5f  Max's              1        6     0         0        Passive
00:0b:86:4a:70:60                     6        0     9         77       Active    2014-01-14 13:25:12(14)
5e:96:9d:69:46:a6  AMNETGuest         1        2     0         0        Passive
00:0b:86:4a:8f:60  rez.mcgill.ca      1        5     15        110      Passive
20:c9:d0:a0:59:da  AbdulAziz          1        5     0         0        Passive
00:0b:86:4a:e4:21  wpa.rez.mcgill.ca  1        19    0         0        Passive
2c:e4:12:8d:4a:c7  BELL860            1        4     0         0        Passive
00:0b:86:4b:0f:a0  rez.mcgill.ca      1        6     15        102      Passive
00:0b:86:4b:0f:a1  wpa.rez.mcgill.ca  1        6     15        101      Passive
00:0b:86:4b:1e:80                     11       0     15        95       Active    2014-01-14 13:22:56(1)
Contributor I
Posts: 34
Registered: ‎11-06-2012

Re: Removing channel 1 from 2.4?

I would manipulate the ARM threshold settings and still allow for automatic channel selection.  I agree that removing channel 1 completely would cause more harm than good.

 

 

Contributor II
Posts: 55
Registered: ‎03-03-2011

Re: Removing channel 1 from 2.4?


Evan W wrote:

I would manipulate the ARM threshold settings and still allow for automatic channel selection.  I agree that removing channel 1 completely would cause more harm than good.


We do have automatic channel selection for 1, 6 and 11.  Not sure how much more we can tweak, the fact is there is just too much noise on channel 1 in this environment due to outside sources out of our control, hence our idea just to not use this channel and use 6 and 11, and maybe even then lower power levels from 6->12 instead of 9->15

Contributor I
Posts: 34
Registered: ‎11-06-2012

Re: Removing channel 1 from 2.4?

Why do you think that ARM is not moving the APs off of channel 1 on it's own?  

Contributor II
Posts: 55
Registered: ‎03-03-2011

Re: Removing channel 1 from 2.4?

It doesn't look like it is:

 

 

ARM History
-----------
Time of Change       Old Channel  New Channel  Old Power  New Power  Reason
--------------       -----------  -----------  ---------  ---------  ------
2014-01-14 13:59:44  1            1            12         9          P-
2014-01-14 13:39:53  1            1            9          12         P+
2014-01-14 13:28:05  1            1            12         9          P-
2014-01-14 12:37:36  1            1            9          12         P+
2014-01-14 12:20:43  1            1            12         9          P-
2014-01-14 11:35:53  1            1            9          12         P+
2014-01-14 10:54:31  1            1            15         9          P-
2014-01-14 10:50:06  1            1            12         15         P+
2014-01-14 10:44:47  1            1            9          12         P+
2014-01-14 10:26:33  1            1            12         9          P-
2014-01-14 10:20:22  1            1            9          12         P+
2014-01-14 10:11:57  1            1            12         9          P-
2014-01-14 10:03:49  1            1            9          12         P+
2014-01-14 09:56:41  1            1            12         9          P-
2014-01-14 08:43:43  1            1            9          12         P+
2014-01-14 08:37:32  1            1            12         9          P-
2014-01-14 08:33:01  1            1            9          12         P+
2014-01-14 08:26:00  1            1            12         9          P-
2014-01-14 07:57:06  1            1            9          12         P+
2014-01-14 07:36:10  1            1            12         9          P-
2014-01-14 07:28:37  1            1            9          12         P+
2014-01-14 07:10:57  1            1            12         9          P-
2014-01-14 07:03:40  1            1            9          12         P+
2014-01-14 06:23:58  1            1            12         9          P-
2014-01-14 06:18:18  1            1            9          12         P+
2014-01-14 06:11:08  1            1            12         9          P-
2014-01-14 05:55:04  1            1            9          12         P+
2014-01-14 05:42:32  1            1            12         9          P-
2014-01-14 05:24:43  1            1            9          12         P+
2014-01-14 05:19:59  1            1            12         9          P-
2014-01-14 05:14:49  1            1            9          12         P+
2014-01-14 05:08:45  1            1            12         9          P-
Guru Elite
Posts: 21,491
Registered: ‎03-29-2007

Re: Removing channel 1 from 2.4?

How is your coverage? If ARM can afford to go all the way down to 9, you might want to turn off an access point here and there and measure your utilization after that.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

MVP
Posts: 4,307
Registered: ‎07-20-2011

Re: Removing channel 1 from 2.4?

[ Edited ]

 

Run the following command  , it will tell you how many devices are currently interfering with your AP or APs:

 

show ap monitor ap-list ap-name <ap-name>

 

Monitored AP Table
------------------
bssid essid chan ap-type phy-type dos dt/mt ut/it encr nstas avg-rssi curr-rssi wmacs ibss

----- ----- ---- ------- -------- --- ----- ----- ---- ----- -------- --------- ----- ----

 

Under the AP-TYPE column you can see whether there's devices interfering with your AP

 

Based on the ARM history output it doesn't seem as your AP is trying to change channels constently because of interference 

 

You could also run this command to make sure there's isn't a low noise levels 

show ap arm rf-summary ap-name <apname>

 

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Search Airheads
Showing results for 
Search instead for 
Did you mean: