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Contributor II
Posts: 36
Registered: ‎08-28-2014

Constant dropouts for our Motorola/Symbol Scanners MC9090G

Hi Guys

 

We have hit an annoying snag.

 

On the weekend we replaced most of our old Symbol Wireless AP with the Aruba AP-115s these AP have been great for everything else apart from our Hand scanners that were using the Symbol AP's.

Since the change the scanners are constantly and randomly dropping wireless connection. Most times they ahve to warm boot the scanners to get the connection back then it might run well for a while but later it will drop out again.

 

Any ideas on What could be casuing this.

The hand scanners are the above model Motorola MC9090G's

We recreated the same SSID as the old AP's using the same PSK. 

The scanners connect fine but randomly lose connection.

We are using a 7210 Controller and all of our AP's have 4 SSID's 2 guest accounts one with PSK and the other using captive portal.

We have an internal network using Radius server and the Hand Scanner network which uses a PSK. 

 

Thanks

 

Anthony

 

Guru Elite
Posts: 21,279
Registered: ‎03-29-2007

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

At What power range are the aps operating?


Colin Joseph
Aruba Customer Engineering

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

Contributor II
Posts: 36
Registered: ‎08-28-2014

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Hi Cjoseph

 

I am not exactly sure which power you are asking for but the 2.4GHz band is running on N(20MHz) the 5Ghz Band is running on N(40Mhz)

They are running on POE from our switches so 48 Volts I think is the standard is that what you are after?

Thanks

Guru Elite
Posts: 21,279
Registered: ‎03-29-2007

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Can you SSH into the controller and get into enable mode?  If so, paste in the output of:

 

show ap active

show ap radio-summary

 



Colin Joseph
Aruba Customer Engineering

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

Contributor II
Posts: 36
Registered: ‎08-28-2014

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Here you go

 

Active AP Table

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

Name             Group IP Address   11g Clients 11g Ch/EIRP/MaxEIRP 11a Clien                                                                                                                                                             ts 11a Ch/EIRP/MaxEIRP AP Type Flags Uptime           Outer IP

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

Supervisors     SMRAP 10.1.110.4   1           AP:HT:1/9/25.5       1                                                                                                                                                                        AP:HT:40-/21/21     115     a     28d:2h:52m:58s   N/A

Admin-Eng-East   SMRAP 10.1.11.111 5           AP:HT:1/15/25.5     5                                                                                                                                                                        AP:HT:52+/21/21     115     a     41d:0h:2m:9s     N/A

PCB-Cleanroom   SMRAP 10.1.11.39   0           AP:HT:11/25.5/25.5 2                                                                                                                                                                         AP:HT:153-/21/24     115     a     40d:9h:57m:50s   N/A

Moulding_Desk   SMRAP 10.1.11.104 0           AP:HT:1/12/25.5     0                                                                                                                                                                         AP:HT:100+/24/24     115     a     20h:26m:44s       N/A

Stores           SMRAP 10.1.11.139 5           AP:HT:11/18/25.5     0                                                                                                                                                                        AP:HT:161-/24/24     115     a     3d:4h:48m:28s     N/A

Admin-Eng-West   SMRAP 10.1.11.135 14           AP:HT:1/25.5/25.5   1                                                                                                                                                                        AP:HT:100+/24/24     115     a     189d:23h:7m:51s   N/A

South_Wall_Fact SMRAP 10.1.11.178 2           AP:HT:1/9/25.5       2                                                                                                                                                                        AP:HT:60+/21/21     115     a     3d:2h:18m:40s     N/A

Canteen-TR1     SMRAP 10.1.11.133 0           AP:HT:11/25.5/25.5   0                                                                                                                                                                        AP:HT:153-/24/24     115     a     4d:23h:53m:53s   N/A

Manuf_West       SMRAP 10.1.11.123 2           AP:HT:6/15/25.5     4           AP:HT:153-/21/24     115     a     233d:23h:27m:22s N/A

Foyer           SMRAP 10.1.11.112 7           AP:HT:11/18/25.5     9           AP:HT:153-/21/24     115     a     189d:23h:3m:7s   N/A

Manuf_east       SMRAP 10.1.11.124 8           AP:HT:11/25.5/25.5   3           AP:HT:60+/21/21     115     a     233d:23h:27m:30s N/A

Plant_Services   SMRAP 10.1.11.76   0           AP:HT:6/15/25.5     8           AP:HT:48-/21/21     115     a     3d:5h:5m:14s     N/A

 

 

APs Radios information
----------------------
Name             Group  AP Type  IP Address   Band  Mode         EIRP/MaxEIRP  NF/U/I     TD             TM                 TC
----             -----  -------  ----------   ----  ----         ------------  ------     --             --                 --
Admin-Eng-East   SMRAP  115      10.1.11.111  2.4   AP^:HT:1     15/25.5       -94/16/1   1/1/1/2/2/2    2/2/2/8/7/9        0/0/0/0/0/0
Admin-Eng-East   SMRAP  115      10.1.11.111  5     AP^:HT:52+   21/21         -93/1/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Canteen-TR1      SMRAP  115      10.1.11.133  2.4   AP^:HT:11    25.5/25.5     -96/5/1    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Foyer            SMRAP  115      10.1.11.112  5     AP^:HT:153-  21/24         -93/1/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Admin-Eng-West   SMRAP  115      10.1.11.135  5     AP^:HT:100+  24/24         -93/0/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Manuf_east       SMRAP  115      10.1.11.124  2.4   AP^:HT:11    25.5/25.5     -95/27/1   8/7/6/7/11/10  6/8/9/9/8/8        6/0/0/0/0/0
Canteen-TR1      SMRAP  115      10.1.11.133  5     AP^:HT:153-  24/24         -93/0/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Foyer            SMRAP  115      10.1.11.112  2.4   AP^:HT:11    18/25.5       -95/17/1   3/1/1/1/2/2    6/6/7/6/6/5        5/0/0/0/0/0
Admin-Eng-West   SMRAP  115      10.1.11.135  2.4   AP^:HT:1     25.5/25.5     -96/14/2   2/2/2/3/4/4    0/0/0/2/4/2        0/0/0/0/0/0
Manuf_east       SMRAP  115      10.1.11.124  5     AP^:HT:60+   21/21         -93/2/0    0/0/0/0/0/0    0/2/0/0/0/0        0/0/0/0/0/0
Moulding_Desk    SMRAP  115      10.1.11.104  2.4   AP^:HT:1     12/25.5       -96/16/1   0/0/0/0/0/0    6/8/9/10/9/6       0/0/0/0/0/0
Plant_Services   SMRAP  115      10.1.11.76   2.4   AP^:HT:6     15/25.5       -92/19/11  0/0/0/0/0/0    2/1/3/3/2/3        0/0/0/0/0/0
Moulding_Desk    SMRAP  115      10.1.11.104  5     AP^:HT:100+  24/24         -93/0/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Plant_Services   SMRAP  115      10.1.11.76   5     AP^:HT:48-   21/21         -93/1/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Stores           SMRAP  115      10.1.11.139  2.4   AP^:HT:11    18/25.5       -95/27/1   9/8/6/8/11/11  10/8/8/8/5/7       3/0/0/0/0/0
Stores           SMRAP  115      10.1.11.139  5     AP^:HT:161-  24/24         -93/0/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
South_Wall_Fact  SMRAP  115      10.1.11.178  5     AP^:HT:60+   21/21         -93/3/0    0/0/1/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
South_Wall_Fact  SMRAP  115      10.1.11.178  2.4   AP^:HT:1     9/25.5        -96/20/1   2/1/1/1/2/2    6/6/7/7/5/6        0/0/0/0/0/0
Manuf_West       SMRAP  115      10.1.11.123  5     AP^:HT:153-  21/24         -93/1/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Manuf_West       SMRAP  115      10.1.11.123  2.4   AP^:HT:6     15/25.5       -93/14/1   0/0/0/0/0/0    7/6/9/7/6/7        0/0/0/0/0/0
Supervisors      SMRAP  115      10.1.110.4   2.4   AP^:HT:1     9/25.5        -95/24/1   2/1/0/1/3/3    12/10/11/13/14/13  0/0/0/0/0/0
PCB-Cleanroom    SMRAP  115      10.1.11.39   5     AP^:HT:153-  21/24         -93/1/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
Supervisors      SMRAP  115      10.1.110.4   5     AP^:HT:40-   21/21         -93/0/0    0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0
PCB-Cleanroom    SMRAP  115      10.1.11.39   2.4   AP^:HT:11    25.5/25.5     -81/57/52  0/0/0/0/0/0    0/0/0/0/0/0        0/0/0/0/0/0

 

Thanks Anthony

Guru Elite
Posts: 21,279
Registered: ‎03-29-2007

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

The RF does not look too bad, but what you can do is enable broadcast filtering at the Virtual AP level to get rid of any broadcasts that are being propagated from the wired network and possibly causing disruption to your wireless.

 

Go to Configuration> Wireless> AP Configuration.

 

Click on the SMRAP ap group to edit it.  Expand Wireless LAN, Expand Virtual AP.  Click on the first Virtual AP.  In the right pane, Enable "Drop Broadcast and Unknown Multicast".  Repeat that for your remaining 3 Virtual APs and see if it helps.

 



Colin Joseph
Aruba Customer Engineering

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

Contributor II
Posts: 36
Registered: ‎08-28-2014

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Ok I did that

Although I did get a the below warning.

Warning: broadcast-filter arp should be enabled with this option. Otherwise ARP requests will be dropped!

Is there something else we need to change here?

Thanks

Guru Elite
Posts: 21,279
Registered: ‎03-29-2007

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Nope. It is just informational.


Colin Joseph
Aruba Customer Engineering

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

Contributor II
Posts: 36
Registered: ‎08-28-2014

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

Cjoseph 

 

That seems to have resolved the issue although we will keep monitoring for the next couple of days.

 

Thanks heaps

 

Anthony

 

Moderator
Posts: 321
Registered: ‎08-28-2009

Re: Constant dropouts for our Motorola/Symbol Scanners MC9090G

hi Anthony

If you find that you still have some glitches, there are a few other default things that can upset scangun type clients:

 

1. ARM changing channels too frequently

2. uneven signal due to too much (default) ARM power range as the client roams around, also ARM changing power level too often.

3. CSD (sometimes, varies by model, older devices like 9090 can be affected)

 

For 1. you can review the ARM history for some of your Aps and see whats going on. if this is a moderate density network, you may have a lot of channel changes due to E or I reasons. Recommend that you split the arm profile into one for 2.4ghz and one for 5ghz.Then, in the 2.4g arm profile we can tweak it a bit to make it less likely to change channel (see below).

 

For 2., take note of the power that most of your APs are already on for 2.4ghz, make this (for now) the max power for the 2.4ghz arm profile. Make the min power 3dBm less. For the 5ghz arm profile, set the min power 6dBm above the max 2.4ghz power, and set the 5ghz max 3 or 6dB above this.

 

Example below, comments with # - again, you need to align this to your deployments current values

 

arm-24g

  min-tx-power 6

  max-tx-power 9               # align to your network

  backoff-time 1800           # may only change channel after 1800
  error-rate-threshold 75    # decrease liklihood of ch changes due to errors
  error-rate-wait-time 90

!

arm-5g

  min-tx-power 15

  max-tx-power 18

!

 

scale these values based on what your APs are currently doing, plus your knowledge of the environment etc.

 

For 3., go to the "rf ht-radio-profile default-g" and change the setting "CSD Override" to true. Some older clients don't like CSD (cyclic shift diversity) and can benefit from this. The symptom you describe plus replacement of the APs sounds like it could be this.

 

Try these three for starters, note that the power difference in the ARM profile should help steer a few more clients to 5ghz as well.

 

regards

-jeff

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