Cisco Wireless :: 3502i - Sporadic Disconnects When 802.11n Is Enabled In Clients
Jul 11, 2012
Recently I upgraded the wireless infrastructure in my campus and deployed WISM2 controllers and Cisco 3502i APs throughout the campus. Until now all my users were using 802.11b/g/a speeds without any issues. However, now I am trying to enable 802.11n speeds in a test group of users by enabling AES encryption and I am seeing lot of issues. These test users sporadically loose wifi connection and an asterix appears in the WIFI icon in the task bar. Interesting part is that all the manually configured wireless networks in the laptop stop displaying. The broadcasted SSIDs continue to show up though. All these users are using "Intel(R) Centrino(R) Advanced-N 6200 AGN" wireless cards with driver version 13.3.0.24. I had upgraded one of the client drivers to the latest 15.1 version. However, he still complained about wireless disconnection (I am not sure about this problem as I didnt personally attend his laptop to know the cause of diconnect).
One another interesting incident is that 2 people from this test group were having a meeting in a conference room once and surprisingly both dropped at the same time with the same symptoms. The only fix was to reboot their PCs.
I have done following changes in my controllers hoping that the problem would get fixed, But still no luck.
1. Enabled client band select.
2. Checked EDRRM for A as well as B/G
3. Changed Channel allocation from freeze to auto.
4. Enabled "avoid persistent interferers".
In my calls with Cisco support we also ran debugs in the controller and sniffer captures in the client machine. All we see in the controller is that the client dropped without any reasons. Also, didnt find anything significant in the sniffer captures. At this point not sure what to do. If upgrading the client driver is an option, then I need to produce some proof or document to the management which says the current 13.3.0.24 has known bugs to run 802.11n speeds. Scanned the entire internet, put a post in intel support site but no luck.
I just bought a linksys 4200v2 router and I still get disconnects every so often.... usually disconnects for about 30 secs then comes back online. When it disconnects, it disconnects all devices on the wireless network router... laptops, iphones, etc..I have tried adjusting some settings in the router but I simply don't know enough to know what I'm doing
Network mode: Mixed (same as 5ghz) SSID: different from 5ghz Security Mode: WPA2/ WPA Mixed Mode (same as 5ghz) Channel Width: 20 mhz only (40 for 5ghz) Channel: 1 (auto for 5ghz) SSID Broadcast: yes (same for 5ghz)
How can I stop being disconnected from the internet? I have inssider and I checked to see what channel my neighbors are using and all of them are using 6 or 11 so I decided to use channel 1 for 2.4 ghz.I have a ~3000 sq ft home with 3 levels (basement, first, second). We do some work in the basement and second floor... most is done on the first.
We recently converted autonomous 1131APs to LWAP. We have some 802.11b clients that were associated to these APs and they worked fine. Ever since we converted them to LWAP, the clients frequently disassociate and it causes alarms on these wireless clients which are used as monitors.
WCS shows the client disassociation and re-association and it says the roam reason as "unspecified". It associates to the same AP and keeps the same DHCP client address etc. I tried setting a static IP on the client but that did not work. We verified the PSK settings and they all match between the clients and the controller. [code]
I have a new deployment with a Cisco 5508-50 controller running 7.0.220.0 code and 35 AIR-LAP1262N-A-K9 access points. Current legacy clients have trouble connecting and after connecting they may or may not drop off and have trouble connecting again.
E4200 Version 2.0.37.131047 disconnects my wireless clients intermittently. I am seeing it mostly on the 5Ghz band but that is where most of my clients are connected. I have all the setting in advanced tweaked per cisco best practice. It just seems to reset every so often. Wired connection is not disconnected.
Currently using intel 5100 & 6200 client cards on multiple driver versions. WiSM is 7.0.116. APs are 1250 and 1260 series. Citrix is setup to send server-side keepalives for session reliability. Randomly, several times a day the client will get disconnected from the Citrix application session but maintain connectivity to the AP and other applications continue to work. Traces show the server-side keepalive reach the controller but are delayed from controller to client by 5-6 seconds. Just enough time for the Citrix server to timeout and tear down to session. Additional testing shows the delay most likely occurs somewhere from controller to AP. It occurs on multiple controllers on multiple campuses.
We have Dell/Broadcom clients that don't experience the problem. The only commonality seems to be the Intel cards. CCX? I know Intel has a special relationship with Cisco regarding CCX and have developed features not available on other cards. Tried disabling power save and other CCX features but hasn't solved the issue.
Ive been running my computer on our home wireless internet connection with almost no problems, but about two weeks ago our internet went down and after it went back up a day later i had very slow internet speed and a very sporadic connectivity (random disconnects, dns timeouts etc) I used to get speeds up to 20-22 mbps but now i can barely push 4mbps, the other computers on our network has fine connectivity its only my stationary computer that has these issues
Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. Med ensamr�tt. C:UsersGreattech>ipconf /all ipconf �r inte ett internt kommando, externt kommando, program eller kommandofil.[code]......
I have a office that was converted from a older townhouse. The building has 3 floors with the distant of each floor expands no more than about 60 - 75 feet from end to end of the building. Not sure what's in the walls as the building is at least 20-25 years old. Total number of users is about 20 - 25.
Here is the problem..
I have a WRT54G wireless router setup to provide wireless coverage for this office, located on the 2nd floor, For some reason, about 10 - 15 feet from the opposite end of the building, the signal drops off big time. Regardless of the floor. So to assist with the signal, I installed a wireless 300N Gain extender on the same floor on the opposite end of the building where the signal was weak. At first, it seemed to work by boosting the signal, but then it seems to show the same issue as before.. sporatic signal loss, signal fluctuation, etc.
My question is should I replace the wireless booster with multiple wireless APs located throughout each floor... maybe 1 per floor? If so, is there a trick to configuring all 3 APs to have the same SSID and same encryptionsso it will be seamless to the users? Since the first AP works fine, I wanted to get 2 additional WRT54G units.
We have about 20 of the above WAPs in our company network and are quite satisfied with the performance.However occasionally we need to manually reboot the WAPs in order to resolve sporadic connectivity issues that cannot be resolved on the client devices. In order to optimize the performance we would like to automatically restart our WAPs at a certain time (e.g. at night) on a daily or weekly basis.We are currently using WAP4410N-fw-2.0.0.5-K9.
I have a 3750 acting as the DSW, with a few 2960's (asw's) attached to it going to different buildings.
One building has been complaining of random 15 second to 1 minute outages. Its rare though. Happens anywhere from once per week to maybe 4 times per week. The times of the day it happens is random also.
I've had them ping the gateway when it happens, and the ping fails for a few seconds then starts to work.
One of them ran a continuous packet sniff, and sent it to me after it happened. Nothing weird going on in the sniff, except for the obvious failure of getting traffic. When it happens I see a crap ton of arp requests to the gateway, which makes sense I suppose since the hosts can't get past the gateway anymore.
They've replaced the fiber to LIU, the sfp, and then even the 2960. Its updated to latest code.
I'm guessing the problem is at the 3750. We havent touched it yet. CPU/memory looks fine (when checking the history). No input/output errors on any interface. Logs don't show anything, not even a flapping interface. But we are always looking at this after the fact, since by the time they email or call us, it has already passed...
Other buildings that are fed from this 3750 haven't complained though, so I'm not sure if they are experiencing problems or not.
Here's my situation.I had an 8 year old desktop computer that I just replaced with a brand new one (Lenovo). Prior to replacing it, I assumed the slowness and occasional inability to connect to the internet were caused by the computer being so old. But once I replaced the computer I still had problems - in fact it was worse.
At that point I was reminded that the modem was also 8 years old so I had the cable company replace it (Scientific Atlantic Model DPC2203C). The connection improved for a few days but then it went right back to how it was.
I have a wireless router (Cisco Linksys Model WRT160N V2), which is hooked up properly. When I got the new modem I had to reset the router. My wife's laptop now sometimes has connection problems which it never had before, and on my (work) laptop I can access the wireless connection but not through the same entryway that I had before. I'm providing this information because I think it may be relevant. It seems like something has to be up with the wireless router since I reset it. Another thought is that possibly the problem is with one of the wires between the router and either the modem or the computer - not sure if the sporadic connection problems is an indicator of that.
I am in the process of deploying 3502i APs. This site has 2 - 5508 WLCs both running Software version 7.0.220.0 and 2 - 4402 WLCs both running the same version of software as the 5508s. All of the APs that I have installed so far have joined the controller and I can associate to them and access the network. When the APs first are connected to the switch they go through the 'normal' boot up with the LED changing colors - white, red, green, blue (not necessarily in that order). Once the AP has completed its boot sequence the LED goes out and remains NOT lit.
This is happening to most but not all of the APs. This is the first time I have deployed 3502s - previous experience is with 1142s and 1242s and the LED does not do this with them.
I can, through the CLI, turn the LED on but it is then ALWAYS blue, even if a device is NOT associated to it.
I do not want to leave them off because the account will believe they have a 'dead' AP and with them always blue they cannot properly troubleshoot using the LED.
I have 4 desktops cat5 to Dlink DIR 615 router. All work fine. Any wireless clients, laptop or netbooks, see the desktop computers for a while then disconnect somehow. All machines can see the Internet through the router at all times. The desktops disappear from the laptop/netbooks but the wireless machines can be seen from the desktop computers but clicking on them gets 'Access Denied' message after a wait.3 desktops = XP, 1 98SE. All laptop/netbooks = XP
In an idle situation how much area is covered by a cisco 3502i acceccpoint , I understand there are many factor that will effect this , thats why I am adking in idle situation , I am looking for a number is square feet.
I have a customer with several older Aironet 1121G WAP's. In one area of the plant the noise levels from several large motors is preventing reliable connection to the WAP, even though it is located in the same conference room as the users. I am suggesting upgrading the 1121G to the 3502I to take advantage of the Clean Air technology. This raises two questions:
1) Will a single 3502I be able to effectively handle the RF noise, or does it require a network of WAPs to function properly?
2) Does the 3502I require the CT2504 controller for the Clean Air to work, or will it function in a stand alone mode?
how to convert a 3502 access point from Autonomous to Lightweight ? 3502 has a new IOS released back in Dec 2012 to work as staandalone mode. I need to convert this back to Lightweight mode.
I have been searching on web but have had no luck so far with anything. Tried converting it to lightweight in the same way as putting it on Autonomous IOS but errored out.
When we were installing some new APs, were plugged in to ports that were not configured on the WLC management VLAN.
This is the illustration
WLC management VLAN is VLAN 80 Management VLAN of infrastructure (Switches routers) is VLAN 10
The APs were plugged in to VLAN 10 and they were not able to associate themselves with the controllers.
Through research, those APs were getting a wrong IP address,
I did the Mode button, pressed for 30 secs, but this did not fix the problem, i thought it was going to clean the flash and bring the AP back to factory default I do not believe this happened.
We also added the cisco-capwap-controller.localdomain to our DNS servers, and then I rebotted the APs and still no luck.
What fixed the issue is we had to go to the DHCP server, release the IP addresses and we found those based on the macs of the APs. What is we do not have the mac addresses?
Now that I have the DNS entry created, if I plug in an AP on the wrong VLAN port will I be able to see it?
I have AP which is not connected to switch.I console it and it gives error unable to to get IP from WLC.Need to know is there any way that i can go to command prompt of this AP without getting IP from WLC? I tried control + c etc it does not go to command prompt.
I have a 3502i(AP_1) that will not join a 5508 WLC(WLC_1)(code 7.2.103). The 3502i(AP_1) will join 4402 WLC(WLC_2)(Code 7.0.230). I have another 3502i(AP_2) that will join the WLC_1 & WLC_2. I am using capwap discover through DNS and hard coding the primiary WLC to AP_1 & AP_2. When I debug capwap events and errors, I see the static capwap messages and replies. Both of the WLC are on the same subnet. I have defauted the AP_1 and it joins the CISCO-CAPWAP-CONTROLLER as expected. When I change the Primiary WLC to WLC_1 it goes back to the CISCO-CAPWAP-CONTROLLER. If i change the primiary WLC to WLC_2 it joins. If I change the primiary back to WLC_1 it joins WLC_2 even though it is not a secondary. I know the previous joined WLC are stored in NVRAM, so that might be why it is doing that. I can join other ap to WLC_1 just not this one.
I am having a Wism on 6500 chassis with software code 7.2.103.0 Now......... I use to have 7.2.111.3 on the Wism before but for some reason I had to downgrade the code to an older version (some compatibility issues with the NCS)......
Now before all the APs were having 7.2.111.3 version running as soon as I downgraded the controller IOS most of them downgraded the code but a few still did not show up...... so I picked one of them and did a factory reset on the AP and was guessing that it might get the new code from the controller this way but unfortunately since than I have tried a lot of things but no luck. I have switches configured on layer 3..... other APs connected to this switch are working fine,........ when I reset the AP to factory default it doesnot take an IP obviously so I manually define the IP,,, you would find that configuration below too.... but than after a while it trys to locate the controller and could not find it.... where as, as i said other APs on teh same switch works fine......
the only thing i notice is that it does not release the IOS .. it is still having 7.2.111.3.....
using MCNG ddr static values from serial eeprom ddr init done Running Normal Memtest... Passed. IOS Bootloader - Starting system.
This problem only seems to affect one of our sites. Every once in a while, several APs would lose link to the 5508 and get stranded. The only way to fix the issue is either to power cycle, or better yet SSH into the APs and use the command "capwap ap controller ip address x.x.x.x", and then they'd automatically rejoin the controller. At first, I thought network hiccups caused the APs to lose connectivity, but there's none that I could find. I have the primary/secondary controller IPs configured in them as well. See log below:
[previous log entries show AP working as intended, then...] *Jan 18 05:29:29.632: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_ECHO_REQUEST ., 1) *Jan 18 05:29:29.632: %LWAPP-3-CLIENTEVENTLOG: Switching to Standalone mode *Jan 18 05:29:29.645: %CAPWAP-3-ERRORLOG: GOING BACK TO DISCOVER MODE *Jan 18 05:29:29.645: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to [ommitted due to security reason]:5246 *Jan 18 05:29:29.704: %WIDS-6-DISABLED: IDS Signature is removed and disabled.
The ap 3502i has been registered to the wireless controller, but now want to restore the factory settings, repeated after the upgrade or will appear before the registration information of the wireless controller,
We have a 2504 WLC and 8 352l AP. All AP are working and can be seen in the WLC except 1. It can grab an ip address but cannot see on the WLC. the show AP join...only shows that it is trying to join but no error indicated. A debug cap swap events didn't show the ip add.
My 3502i suddently shutdown it's Radio interface and when I connect to it, I cans ee that the interface is shutdown. So tryign to enable it but the "configure terminal" command is not available. Is there any hidden command to go the priveledge mode? ______________
interface Dot11Radio0 no ip route-cache shutdown antenna gain 0 beamform ofdm mbssid(code)
How to upgrade C3502i to Lightweight? I failed to upgrade using Upgrade tool v3.4. The error message is "AP model is not supported" . how can I upgrade it?
I have a WLC2106 and AP3502i. The issue that I am having is the radio for 5GHz is not showing up in "Wireless > 802.11a/n" (see attached screenshot) I am not exactly sure what was the problem. When I went to 802.11b/g/n I do see an entry for 2.4Ghz radio, but nothing on 5GHz.
I have the AP plugged directly to my 3550POE, and when I used the command "show power inline" it says that the switch is providing 15.4W and there is still 345W remaining on the switch. The LED on the AP is solid green. I issued a no shutdown on dot11radio1 and the status is up/up, but there is still no entry under "Wireless > 802.11a/n"
how can i upgrade to Mini IOS Version 7.3.1.73 on the AIR-CAP 3502I. we some that have Mini IOS Version 7.3.1.73 and some that have Mini IOS Version 7.0.112.74. want them all the same.
I have a newly purchased Aironet 3502i that I would like to configure on my network. I am new to Cisco networking in general, and would like to know how to configure the device to operate without a WLAN Controller.
I've got a number of 3502i's that I need to mount in a new classroom that does not have any ceiling (except the floor decking above). Ceiling is roughly 30-50' up. Contractors are going to run several 2" (or whatever we want) metal pipes from the ceiling down to a more reasonable level to mount the access points on and get below the hvac ducts/etc in the ceiling.
Problem is I can't find any bracket or mounting options for this! What are others using in this situation for mounting one of these access points onto a metal pipe such as this? I've checked Oberon Wireless, Terrawave and I don't see anything glancing through the product catalogs. Anyone mounting access points this way?
I have a trouble with AIR-CAP3502I-R-K9 AP.I tried to upgrade IOS software in ap because it was connecting and disconnecting to controller too often. I already upgraded one of two access point and it working stable at this time, but the second one not. [code] So, I even can't load new software. What can I do now?
