Cisco Wireless :: AP541N - Installation Requirements For Multiple Units
Jul 22, 2011
A couple of questions about the AP541N:
1. How to get these installed and working properly, especially in a clustered environment? I have read so many comments about slow performance, no performace, bad coverage, etc... They sound like the perfect product for my intended use if they actually work as advertised.
2. what is the installation requirements for multiple units? (What is the minimum/maximum distance between units? How many units are needed for a certain area?
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Sep 20, 2011
Installed 4 AP541N units in a client site and they've now come back with reports of issues with the setup. I went out there today to take a look and the issue is primarily that randomly during the day, clients will loose access to DHCP. The client authenticates fine (we see success logs in the Windows 2008 RADIUS event logs) but doesn't manage to get an ip address.To sum up the things with the current setup:
- Running version 2.0 Code on the AP541N's.
- Using Windows 2008 for NPS (RADIUS) and DHCP.
- Cisco Catalyst Switching in the back end.
Things tend to work fine in the morning. It's as the site hits midday that we start seeing issues.In looking at the issue I've come across a number of posts in regards to issues with DHCP and these units. One item that was suggested to switch off Mutlicast / Broadcast limiting on the Advanced Settings. What's weird with this is that if I do disable this option, RADIUS authentication stops working entirely. Switch limiting back on and RADIUS works again. I've confirmed this with Network Monitor running on the RADIUS Server.
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Aug 30, 2012
Antennas were set aside prior to device installation, and now can't be found. Can they be ordered as a replacement kit?
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Nov 6, 2011
We are considering order the AP541N for our network. A few questions...
1). Are there multiple models of the AP541N? or just one cisco part number?
2). I am assuming the basic antenna comes with it. If this is something that I need to buy seperate.
3). Are there part numbers for the POE injector? Need to know part numbers on the AP541N and the poe injectors?
4). We would buy a couple of these and run them in cluster mode. My understanding is that I won't need a controller. Do I need to buy a certain model to use the clustering or is that available on all the AP541N?
5). Can I have this talk to active directory to authenticate users? Is that tough to do? Do I need install some kind of agent on a domain controller? I have configured the ASA to use Active Directory for authentications. Should it be any more difficult that that?
I have setup a few other Cisco APs before and am generally familair with wireless. But, I am not a "wireless expert" and don't have any experience with this particular product.
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Jun 26, 2012
I have a WLC 5508 with LWAP 1242 with wireless bridges connected to the APs I cannot get DHCP to pass through the bridge to the PC connected to the bridge.
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Apr 16, 2013
We had several AIR-LAP1131AG-N-K9 devices have a peculiar failure recently.About 10 total units failed in groups of 2-4. Each group was on the same 3560 switch, and they failed at the same time.Now all but one of the units will power and work properly with an inline power injector. But they are either intermittent or not at all when connected to the POE Switch. Even when I use a 3ft patch cable to connect directly to the switch. I have certified the cable and they do the same no matter which port or cable used. 'show inline power' command will show these failed units as 'Iee PD'v
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Jun 23, 2011
I bought an e4200 about 2 months ago. It worked perfectly for 3 weeks. Then all of the sudden, the 5ghz connection started dropping. Then it's disappeared completely and it would not show up in a network search. Then the 2.4 ghz started going crazy. I reset it completely, that didn't work. I let it sit for half a day, nothing. I sent it back to newegg and got a replacement. When the 2nd one came in, it worked fine until the next day. 5ghz cut out. I called linksys support and they were no luck. I reflashed to 1001 firmware and it mysteriously came back to normal. It was working perfect until today. 3 weeks later. 5ghz went out, and never came back. I reflashed 1001, nothing. Reset, nothing. Flashed the new 1002 firmware, nothing. 2.4ghz still kind of works, but the speed is barely 5mbps. I'm at a freaking loss right now. This was the best performing router I have tried, of all the top models available right now
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Nov 23, 2011
I have both WAG320N and E4200, they are currently linked (wired) together as a bridge (it is not ideal or necessary, but lets move pass this point) and is working fine. But I'd like to place the E4200 on a floor above (which cabling is not an option) and is wondering how the two units can be bridged wirelessly while status quo on everything else.
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Mar 27, 2013
I just installed 2 new units and neither will connect to a new HP gigabit switch - no link light, other devices can connect to the switch OK. Their gigabit ethernet settings are set to auto for duplex and speed. I also tried forcing one of them to full duplex and 1000 Mbps which didn't work either. They're both powered by POE injectors. If I connect them to a 10/100 switch they work fine.
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Apr 8, 2012
this note is from the 5508 controller config manual, does this apply to 1040 access points in a mesh network?
Note:The recommended power source for MAPs is either a power supply or power injector. PoE is not a recommended power source for MAPs.
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May 21, 2012
is there any issue in buying air-ap1142n-ek9 802.11A/G/N FIXED AUTO AP INT ANT and later on converting it into lightweight under the control of air-ct2504-15k9 2504 WIRELESS CONTROLLER WITH 15 AP LICENSES ?Are there any requirements on the SW of the WLC and the IOS of the AP? The reason of the choice is budget.
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Sep 8, 2011
I have a pair of SRP527W-U units, which each connect to a seperate ISP by ADSL2+I am attempting to use each simulatenously as follows:ISP-A via CiscoA for general traffic, and to run HTTP server X,ISP-B via CiscoB to run HTTP server Y,HTTP servers X and Y are on one machine, but binding to two seperate IP addresses eg x.x.x.3 and x.x.x.4,In a situation like this, I would normally configure CiscoA and CiscoB with x.x.x.1 and x.x.x.2 respectively,CiscoA would run DMZ to x.x.x.3 and CiscoB DMZ to x.x.x.4,The server would use x.x.x.1 as the default route.Then I would set CiscoA to have a policy route catching source address x.x.x.4 and sending it to next-hop/gateway x.x.x..
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Apr 16, 2013
How many C3K-PWR-750WAC units in PWR-RPS2300 do I need for router CISCO2921-HSEC+/K9?
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Dec 3, 2011
We purchased a new monitor to the pc where the router is connected. Since then, my laptop does not connect to the internet. My network is on the list but it says "The settings saved on this computer for network do not match the requirements of the network" and the Connect button is not active.
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Feb 19, 2010
I have many of these, many models and versions. I have a WRT54G v1, V1.1, V2....V8, I also have WRT54GS's WRT54GL's and others, Lots of other Linksys stuff, almost all of it in the Blue and Black boxes of varing sizes.I have a heck of a time when I reconfigure my network or the wife changes the furniture. I'd love a single document that lists the power specifications and adapter requirements for thens devices... I can't find them any where on the Linksys site. I Have looked and searched and nowhere can I find a consolidate list.
Any have a list of the DC power Specifications, Barrel sizes, and other stuff needed to buy a replacement Power adapter. This page url...lists a lot of information but does not list this critical information... I am amazed that Linksys does not have it listed some where here. Losing a wall wart should not be a reason to pull you hair out, just a simple purchase, If they don't want to stock them, then at least tell us what they are.
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Aug 26, 2012
My two devices access the 2.4 ghz wireless network fine on my EA4500.Both my devices, laptop and iPhone4, have N rated network cards. What do I need to use the 5.0 ghz wireless network on the EA4500?Can the iPhone4 use a 5.0 wireless network? When I try to add the 5.0 ghz Wi-Fi to my iPhone4, it cannot find the named but hidden SSID network??
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Dec 7, 2011
I am trying out a DAP-1513 unit but there is no forum section for this? My question seems to be general and might cover the other models also. Do the DHCP request, from the attached LAN devices on the DAP, get pass to the DHCP "server?"
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Mar 29, 2013
I have a situation where are three units stack of 3750 which i need to upgrade.The flash memory on all the switches are the same which is 57.4 MB. The tar file which I was trying to use was 21 MB.
Now the trouble is that the client wanted to do upgrade without overwriting the existing file. I tried doing automatic upgrade using tar file. It started all OK with downloading the tar file successfully on the master flash. but then it failed thereafter. It did not show any error on my telnet screen however I could see errors (Error code 10054) on the TFTP server regarding the download of the same file on the flash ( i am guessing this was the flash of the next unit in the stack).
" You need to make sure you have sufficient space available in the Flash of the master switch. The master switch should have twice the amount of space of the .tar image file size. This space is needed to store the .tar file as well as to store the content of the .tar file that you extract."
The tar file being 21 MB and looking at the dir below I dont think it is possible use this option since I dont have that much space. I have 34 MB free which according to the doco should be atleast 42 MB.what is the best option I have with me given the constraints that I cannot upgrade the flash at this stage.
1. Could I use the manual upgrade (using bin file) if that can do the needful,
2. Do I simple try automatic upgrade using tar file but with overwriting option so it overwrites the existing image on the flash.Could i take a copy of the existing image on the tftp server using "archive upload-sw" command?
3. Is there a way I could upgrade without transferring image onto the flash and instead using tftp for the stack switch to boot from?
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Apr 9, 2013
So I have two Seagate BlackArmor 400 NAS units and I want to transfer a lot of files from one to the other.I can access both through a browser GUI and also are the shares I want to transfer between available in my Network Location in Windows 7. I guess that's the CIFS thing there but not sure.However if I just drag and drop or use something like TeraCopy the speed is very bad. It's like the file actually transfers through my PC which is wireless and not getting great speed.
The Seagate blackarmor has a download manager that supports http and ftp and the share is ftp enabled but I have no idea how it's url would be on local network ( there is no DNS setup for the FTP but it's marked as enabled ). transfer the files between the 2 NAS system without having a PC in between and getting good speed.
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Feb 15, 2012
We had a number of Linksys SRW2048 / SRW2024 switches that had the "bloated capacitor issue" or "bad capacitor issue".These units would basically disconnect/connect their ports.Applications would sometimes crash on workstations.These were all located at different client sites.These were replaced under warranty with the SG300-52 units.When we implemented the SG300-52 units at several sites we noticed the the logs showed disconnect/ connects.We were not seeing apps crash.Support advised they were not aware of any issues.We did a firmware update that was available that made no difference. (1.1.0.73)6 months have now passed.
We noticed at our site very poor throughput one night doing a very heavy file copy data transfer between two computers.It actually ground all other computers on the network to a halt.We inspected the switch.It had "all lights flashing".We thought this strange and shutdown the whole system. Problem still existed.Power cycled the switch. Problem still existed.Noticed their was a new firmware update. (1.1.2.0)We implemented this.The lights on the switch stopped "all lights flashing".Throughput was back to normal. (ie didnt grind all other computers to a halt)
We then had a second site complain of similar issues.Heavy throughput between two computers bought all other computers to a grinding halt.Lights were "all flashing" on switch.Workstation would disconnect/connect in a loop during heavy file copy.We implemented the firmware update thinking this would solve the issue.It now still has the issue of disconnect/connect however and apps sometime crash.We have now replaced the switch with a HP 2510-48G.This is working properly.I have now since been to other sites that also have these SG300 switches and notice the "all flashing lights".
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Mar 22, 2011
I have three pairs of ASA5510 firewalls, each pair configured as a failover pair. When each pair boots up, even if I boot up the primary first, when they are both up and the primary/active syncs to the secondary/standby, the primary always switches to standby and the secondary thus becomes active.
What would cause this? It happens on all three pairs. Does failover look for the highest ID or IP address to determine which of the pair will be active?
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Mar 6, 2013
Region : UnitedStates
Model : TL-WDR3600
Hardware Version : V1
Firmware Version : 3.13.26 Build 130129 Rel.59449n
ISP :
I try to attach an external hard drive to my TL-WDR3600.
The hard drive: TOSHIBA Canvio Desk 3TB USB 3.0 Black Desktop External Hard Drive HDWC130XK3J1 Formatted w/ NTFS, 4kB Block Size (default)
When I attach the drive and click Rescan in "USB Settings" -> "Storage Sharing" nothing happens.Message is still: No volumes found. Plug an external USB drive into this Router, wait for 10 seconds and then rescan the volume.
No entries are made in the "System Tools" -> "System Log" when I attach the drive or click rescan.
The drive works fine on my desktop PC running Windows 8.
I realize that it is a USB 3.0 drive, but I understand that USB 3.0 should be backwards compatible to USB 2.0. In fact, the drive works on both, USB 3.0 and USB 2.0 ports, on my desktop PC.
What are the requirements and/or restrictions for USB hard drives on the TL-WDR3600? The information I found was, that they need to be either formatted with NTFS or FAT32 (FAT32 is not an option here due to the disk size). Are there any size restrictions for external drives on the router? Why are they not listed anywhere (user manual, specifications).
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Feb 28, 2012
I just installed a brand new AP541N-A-K9 (running AP541N-K9-2.0(1) software) and cannot seem to add a SSID. I've tried both from CCA and directly from the Web interface (Wireless:Wireless Network Setup menu). The Add Another button doesn't seem to do anything. I've even tried multiple browser versions.
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Jun 19, 2011
I have 3 AP541N. I become this not in a cluster. The APs standalone in the room. The first AP connect with cable to a DHCP Router from a other manufacturer. The other both APs should be connect over WLAN.How I must configure the APs? Which parameters must install?
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Feb 12, 2013
I have 2 AP541N access points. Have been working well for a couple of years. Later last year they just dissapeard from CCA one day. COundt access them but they were still delivering 'wireless' so to speak I have recently put them back to defaults to try and get them back in to CCA. i had one, but not the other. They would work fine via GUI/web access.Then i updated them to 2.0.4 (both images) and since doing that i have no access to either of them via any form.
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Nov 20, 2012
I mistakenly mis-configured "Management ACL mode" on my AP541N.
Administration>Administration Access Control>Managment ACL Mode
I set this to "Enabled", the problem is I only entered 1 IP address, and that IP address is the SAME IP as the AP's own internal interface. I was not thinking and entered that IP out of habit when I meant to enter my workstation's IP. The FW does not have a safeguard against this.
So, as you can see, this is a big problem, because now I have completely cut off all access (That I can think of) to the router. I can never access the AP as that IP because if I set my workstation to that IP, 1) There will be an address conflict, 2) My computer won't route traffic to the AP out its NIC because it recognizes that IP as itself.
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Jun 20, 2010
As I posted about in the other AP541N thread about degraded performance, mine did a strange client disconnect last week. It dropped all authenticated clients, but they all thought they were still connected. A quick disable/enable of the wireless card on the laptop would get the computer back on the AP.
This same thing happened again today.
Device information and configuration:
Device: AP541N
H/W: V01
[Code]......
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Apr 18, 2013
we have two AP541n APs that were clustered togehter. They are powered using PoE. The other day I discovered one of them wasn't working properly. I couldn't log into it from the web interface so I unplugged it and plugged it back in from the PoE switch. That didn't work. Since then I have taken it off the network and have tried to reset it and I still can't access it. I've tried connecting to it from the default IP, which according to the admin guide is 192.168.10.10, and that doesn't work. I have tried using Telnet and SSH to connect to it using the default IP and the static IP we had set for it. I have set up a little linksys router and plugged the AP and a laptop into it in hopes it might get DHCP, but that hasn't worked either. I have also noticed the WLAN 2.4G and WLAN 5G lights are not coming on. The PWR, SPEED, and LAN lights all come on. The DIAG light comes on when it's furst plugged in and then turns off. Right now it is not plugged into PoE so that light is off too. We had both APs plugged into an ESW-520 that was plugged into a UC560 which had recently been updated to the latest firmware: 8.6.1. The short story is I don't have any connectivity to my AP541n, even after being reset. No wireless, no Web GUI, no ping, nothing. Has this thing become a large paperweight?
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Aug 23, 2010
I purchased quite a few of these APs as they listed the ability to function in WPA2-PSK mode, but on initial configuration I see that this may only apply to standard AP mode? Is there any way to configure WPA2-PSK on an AP541 to AP541 bridge? Unfortunately, this is a must have for our client. If not, what would allow for this with an external antenna port?
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Oct 30, 2012
I have configured two AP541N in a cluster, but only VAP0, is listed as clustered. None of the VAPs seems to be clustered. What can I configure to get all SSIDs clustered?Product Identifier:AP541N-E-K9Hardware Version:V01Software Version:AP541N-K9-2.0(4)
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Mar 6, 2013
I have 2 AP541N's set up using a WDS bridge, broadcasting a single SSID. I am using WPA-PSK for the bridge and WPA/ WPA2 and CCMP (AES) on the SSID. I only have around 75 (Mac, PC, iPad, iPhone and Android) devices that use wireless. Some are laptops that roam around from AP to AP, and are using LAN when they are not roaming. I have increased the roaming agressiveness on PC clients and this doesn't seem to have resolved the weak connection. At most, I have 50 clients trying to access the wireless at one time. My problem is that they keep on dropping the connections and have real problems reconnecting once it's dropped. After 4 or 5 tries, they may or not be able to reconnect.
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Jan 4, 2011
when moving throughout our building my laptop will not switch between AP’s unless it loses its connection with its existing AP then it will see the other AP that is closer and connect to it.
For example, I start at one end of the building where it connects to AP#1 at 270Mbps, if I then slowly go to another section of the building, the speed will drop all the way down to 24Mbps, but it will not switch over to AP#2 unless I turn off AP#1 then the laptop instantly switches to AP#2 at 160Mbps. Again the same behavior if I start walking back the other direction. The laptop will not disconnect from AP#2 until the signal is lost.
With my 2.4GHz wireless 802.11g AP’s (WAP200) I can roam around the building and the laptop will happily jump between AP’s always staying with the faster of the two available.
Settings are all pretty basic.
Mode is set to 5GHz 802.11n Channel is set to AutoA single SSID is running WPA Personal using wpa2, CCMP (AES)Channel is set to AutoChannel Bandwidth is set to 40MHzClustering is enabled and the AP’s see each other just fine.
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Mar 22, 2011
we want to use a WAP 2000 Box as repeater of an AP541n. Do naybody know this is possible or not?
Which Cisco AP boxes are compatible to act as repeater on a AP541n?
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