Wireless Access Point Maximum Users

[rajithahettiarachchi]

Hi,

One of my customers has requested for a wireless solution for a production area in a factory .Actually there are 400 locally customized (automatic) devices needs wireless connections to share some small files (approx 80kb per file) data to be shared will be very light through the wireless network , premises area is 50*35 meters (fully open area) so i suggested four 1702i access points for them , coverage is perfect with four access points but my question is , is it enough four access points for this solution ? what is the maximums client count can recommend per 1702i AP ? If I increase AP's, will the channels overlap?

Rajitha

[Rasika Nayanajith · Accepted solution]

Hi Rajitha,

Usually AP radio can support up to 200 clients, but we should not design network using that value.  In typical office environment (data use) 20-25 is a good number when designing.

In your case I would consider around 50 devices per radio for planning considering the low data use. If those clients are all connecting one band (5GHz) I would consider adding couple of more AP from capacity perspective. From coverage perspective, try to control power to adjust the cell size.

Since it is open space, you need to ensure not channel reuse to avoid CCI (so in 2.4GHz, may be need to turn off few AP radios).

Here are the number comparison for few AP models

HTH

Rasika

*** Pls rate all useful responses ***

[rajithahettiarachchi]

Hi Rasika,

Thanks for the info

[aleopoldie]

What do they mean by 128 for client link ?

[patoberli]

Have a look at the base theory first:

http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1130-ag-series/white_paper_c11-516389.html

and here about the version included in the latest APs:

http://www.cisco.com/c/dam/global/de_de/products/wireless/at_a_glance_c45-691984.pdf

It is recommended to have this always enabled.

[JustTakeTheFirstStep]

Can you provide a url ??

[sanjaydanesh084]

what about 300 clients

[karlatentory]

Hi Rasika, 

This info was very helpful. Can you provide the link where you got the picture please?

Thanks!

[vietthang.leduy]

Hi Rasika,

It is usefull info. BTW, how to rate your response?

I have problem as below:

My office is using a Wifi Access Point: Cisco Aironet 2602E-E-K9 ceiling mount at center of the office about 12 m x 25 m square, number of connected wifi laptop+cell phone wifi about 60 units.

It power using PoE which connected to Ethernet Switch Aruba 2530-48G J9772A port (this switch provide PoE+).

We meet problem: sometime the Access Point restart unattently.

As your experience, can you give advice about all posible reason of this matter. How to fix this problem. Here is the evvent log I get from the Access Point:

611	Mar 1 00:06:29.723 UTC	Information	Interface Dot11Radio0, frequency 2447 selected
612	Mar 1 00:06:27.883 UTC	Information	Interface Dot11Radio1, Station TCSVN-AP1 185e.0ff3.5d9a Reassociated KEY_MGMT[WPAv2 PSK]
613	Mar 1 00:06:24.607 UTC	Information	Interface Dot11Radio1, Station f0d5.bfe2.b828 Reassociated KEY_MGMT[WPAv2 PSK]
614	Mar 1 00:06:23.487 UTC	Information	Interface Dot11Radio1, Station f0db.e2e2.41b5 Associated KEY_MGMT[WPAv2 PSK]
615	Mar 1 00:06:21.983 UTC	Information	Interface Dot11Radio1, Station 1c9e.4684.eed7 Reassociated KEY_MGMT[WPAv2 PSK]
616	Mar 1 00:06:21.323 UTC	Information	Interface Dot11Radio1, Station 3059.b714.d04a Associated KEY_MGMT[WPAv2 PSK]
617	Mar 1 00:06:20.255 UTC	Information	Interface Dot11Radio1, Station TCSVN-AP1 185e.0f07.8b04 Reassociated KEY_MGMT[WPAv2 PSK]
618	Mar 1 00:06:19.979 UTC	Information	Interface Dot11Radio1, Station 2c20.0b0b.b2b7 Reassociated KEY_MGMT[WPAv2 PSK]
619	Mar 1 00:06:14.371 UTC	Information	Interface Dot11Radio1, Station TCSVN-AP1 b881.98e4.7d84 Associated KEY_MGMT[WPAv2 PSK]
620	Mar 1 00:06:14.311 UTC	Notification	Line protocol on Interface Dot11Radio1, changed state to up
621	Mar 1 00:06:13.311 UTC	Information	Interface Dot11Radio1, changed state to up
622	Mar 1 00:06:12.283 UTC	Notification	Interface Dot11Radio1, changed state to reset
623	Mar 1 00:06:12.275 UTC	Information	Interface Dot11Radio1, changed state to down
624	Mar 1 00:06:12.267 UTC	Information	Interface Dot11Radio1, changed state to up
625	Mar 1 00:06:12.255 UTC	Information	Interface Dot11Radio1, frequency 5180 selected
626	Mar 1 00:06:07.523 UTC	Information	Interface Dot11Radio0, Scanning frequencies for 16 seconds
627	Mar 1 00:06:06.435 UTC	Warning	Full power - NON_CISCO-NO_CDP_RECEIVED inline power source
628	Mar 1 00:06:06.435 UTC	Notification	Restarting Radio interface Dot11Radio1 due to interface reset
629	Mar 1 00:06:06.435 UTC	Notification	Restarting Radio interface Dot11Radio0 due to interface reset
630	Mar 1 00:04:04.635 UTC	Notification	Line protocol on Interface GigabitEthernet0, changed state to up

631	Mar 1 00:04:03.635 UTC	Error	Process DPAA INIT top-level routine exited
632	Mar 1 00:04:03.635 UTC	Critical	HW crypto FIPS self test passed (0-0)
633	Mar 1 00:03:59.559 UTC	Notification	Line protocol on Interface Dot11Radio1, changed state to down
634	Mar 1 00:03:59.559 UTC	Notification	Line protocol on Interface Dot11Radio0, changed state to down
635	Mar 1 00:00:31.315 UTC	Notification	Line protocol on Interface BVI1, changed state to up
636	Mar 1 00:00:31.315 UTC	Notification	Interface Dot11Radio1, changed state to reset
637	Mar 1 00:00:31.315 UTC	Notification	Interface Dot11Radio0, changed state to reset
638	Mar 1 00:00:30.915 UTC	Notification	SSH 1.99 has been enabled
639	Mar 1 00:00:30.667 UTC	Notification	SNMP agent on host TCSVN-AP1 is undergoing a cold start
640	Mar 1 00:00:30.667 UTC	Notification	System restarted --
641	Mar 1 00:00:30.279 UTC	Notification	Configured from memory by console
642	Mar 1 00:00:30.259 UTC	Notification	Restarting Radio interface Dot11Radio1 due to interface reset
643	Mar 1 00:00:30.255 UTC	Notification	Restarting Radio interface Dot11Radio1 due to interface reset
644	Mar 1 00:00:30.255 UTC	Notification	Restarting Radio interface Dot11Radio1 due to interface reset
645	Mar 1 00:00:30.247 UTC	Notification	Restarting Radio interface Dot11Radio0 due to interface reset
646	Mar 1 00:00:30.243 UTC	Notification	Restarting Radio interface Dot11Radio0 due to interface reset
647	Mar 1 00:00:30.243 UTC	Notification	Restarting Radio interface Dot11Radio0 due to interface reset
648	Mar 1 00:00:30.111 UTC	Notification	Restarting Radio interface Dot11Radio1 due to hostname change
649	Mar 1 00:00:30.111 UTC	Notification	Restarting Radio interface Dot11Radio0 due to hostname change
650	Mar 1 00:00:29.483	Notification	Line protocol on Interface GigabitEthernet0, changed state to down

651

Mar 1 00:00:15.727

Critical

IOS crypto FIPS self test passed (15)

[patoberli]

Please create a new thread for this and also include the software version of the controller or (if autonomous) the access point.

[vietthang.leduy]

Sorry that my post is meet this trouble: "Your submission has triggered the spam filter and will not be accepted. If you feel this is in error, please report that you are blocked.". Is it possbble, pls post this issue for me.

If you have any clue, pls give advice.

My AP is in autonomous mode. Software version as below:

System Software Version:  Cisco IOS Software

Product/Model Number:	AIR-CAP2602E-E-K9
Top Assembly Serial Number:	FGL2030X2U6
System Software Filename:	ap3g2-k9w7-xx.153-3.JD
System Software Version:	15.3(3)JD
Bootloader Version:	BOOTLDR: C2600 Boot Loader (AP3G2-BOOT-M) LoaderVersion 12.4(25e)JAY, RELEASE SOFTWARE (fc1)
System Uptime:	1 day, 17 hours, 57 minutes

[patoberli]

There is slightly newer software available 15.3(3)JD4, but the release notes don't note anything sounding like a crash fix.

There was a command to show the crashlog or dump file, but I don't remember it. That one often states why it crashed.

Also a "show version" might show a little bit more (reload reason ....).

[vietthang.leduy]

I run "show version" but "reload reason" area is blank.

Please try to find out how to view crashlog/dump file. Thanks a lot.

Thang.

[patoberli]

Found it. If it rebooted because of a crash, you should find the info by issuing "show crash". If it tells you that there is no crash file, then it either didn't crash or was unable to write a file.

Have you checked on your switch if it maybe looses the power? Because a blank reload reason could be a short power interruption.

[vietthang.leduy]

This is the output of "show crash":

"

TCSVN-AP1#show crash
==== Last Crash Saved in OCM ====
Stacks:
Last reset from Exception!
SP: 0x05659154 PC: 0x01460C1C
SP: 0x056591A0 PC: 0x0146663C
SP: 0x056591D8 PC: 0x00000000
SP: 0x056592B8 PC: 0x0212C0DC
SP: 0x056592D8 PC: 0x01869030
SP: 0x05659330 PC: 0x01869C20
SP: 0x05659358 PC: 0x0186CCD8
SP: 0x056593A0 PC: 0x01862A28
SP: 0x05659448 PC: 0x0186AEB0
SP: 0x05659478 PC: 0x018455EC
SP: 0x0407CE50 PC: 0x01496CD0
SP: 0x0407CE60 PC: 0x014928CC
SP: 0x0407CEB8 PC: 0x014928CC
SP: 0x0431714C PC: 0x01496D98
SP: 0x04317158 PC: 0x01330F34
SP: 0x04317188 PC: 0x0769B760
-Traceback= 0x01460C1C 0x0146663C 0x00000000 0x0212C0DC 0x01869030 0x01869C20 0x0186CCD8 0x01862A28 0x0186AEB0 0x018455EC 0x01496CD0 0x014
928CC 0x014928CC 0x01496D98 0x01330F34 0x0769B760
Registers:

==== Last Reset Saved in OCM ====

How to translate these information to human understand?

My Access Point is powered by PoE via ethernet cable connected to Ethernet Switch Aruba 2530-48G J9772A fully support PoE+ . Is it possible this PoE+unreliable? If so, how to check this PoE+ source?

Many thanks,

Thang.