Cisco Wireless :: Antenna Alignment On Aironet 1252
Oct 27, 2012
I am using two Cisco Aironet 1252 (cisco AIR-AP1252AG-A-K9) to setup a point to point link (one is configured as root bridge and is as a non-root bridge). Both Aironets are running software version Version 12.4(25d)JA.
Is there a way that I can that I can perform an antenna alignment test on the Aironet that is configured as a non-root bridge?executing the following command dot11 dot11radio 0 ? does not show the antenna-alignemnet option.
we have a couple of AP1262N-E-K9 APs with firmware version 12.4(25d)JA1 operating in autonmous mode. One AP is setup as repeater while all others are in root mode. My goal is to perform the antenna-alignment test through an SSH console on the repeater with a given timeout-value, e.g.:
"dot11 dot11Radio 0 antenna-alignment timeout 4"
However, the behavior of this command is inconsistent as the timeout value is ignored in 20% of the tests. I.e. in 80% of all tests, the scan really runs only 4 s as specified using the "timeout" parameter. In the other 20% of the tests, the "timeout" parameter seems to be ignored: Often the antenna-alignment scan runs for about 140 seconds and in some cases even for 420 seconds. This is problematic as the access point is completely unavailable during the test, i.e. the configuration ssh/web interfaces are not reachable and no clients can associate to the access point. [URL]
I would like to add an additional antenna to a 1252 LAP but I'm unsure of a few things...
I know this LAP currently has at least a yogi directional antenna (AIR-ANT2410Y-R) and also a ( AIR-ANT2485P-R) connected to it. The access point is in a ceiling so I cannot view the connections but according to this data sheet, { URL } each of the antennas I've specified require 3 per AP. I am only aware of 1 of each being used so not sure why 3 would be required?
Also on my 1252 1 side has 3, 2.4Ghz connections for antennas, TX, TX&RX, and RX. If I want to only use 1 AIR-ANT2410Y-R, would this be connected to the TX&RX port? Do all antennas support transmit and receive or are there some that only support TX and others that only support RX or is this based only how you configure the antennas? On the other side of the access point there are 3, 5Ghz antenna connections.
I have two Cisco Aironet 1252 that I want to configure as a point-2-point bridge. Now I want to know if this configuration supports the 802.11n protocol.
an Aironet 1252 which is failing on boot. When power on the access-point shows the error below.
WARNING: A memory error occurred during the system start-up self-test. The device must be serviced if the error persists.
The following commands can, optionally, be used to initialize the flash file system and the TFTP file transfer system:
But when this happen, I can start the IOS manually doing flash_init and boot in ROMMON. After do this commands, the access-point starts and works normally.
How can I check and correct the memory and solve this issue?
I have 2 cisco Aironet 1252 setup as a point to point link using an external antenna (one radio is setup as the root bridge the other is setup as the non-root bridge). Now I see that the connection between the radios is established at a speed of 54 Mbps. However when I perform a speedtest on the link I see that the my actual download speed does not exceed the 2,5 Mbps. what can cause my actual speed to be far lower than the 54 Mbps? And what can I do to improve it?
Okay, I'm working on a project and the company I work for wants to add 5 Ghz antenna's to their Aironet 1252's. Okay not a problem, except I've never worked with these routers before and I can't get the configuration set (). Once I get 'em on one I can get them all done.
I have two cisco airenet 1252 autonamous access point that are configured as point to point bridge. Now I want to confiure AES encryption or WPA2 using a pre-shared key however I do not see the option to do this . The only option I see under ciphers are:
wep 128 wep 40 TKIP
[Code].....
Is it possible to use either AES or WPA2 using a pre-shared key on the 1252 autonamous access point? preferably using the web interface.
I am trying to poll the 5 minute average CPU utilization of my Cisco Aironet 1252 (IOS version 12.4(25d)JA) using SNMP OID .1.3.6.1.4.1.9.2.1.58.0.However for some reason I am not getting any response back from the aironet. Note I am able to retrive the memory utilization without a problem.
as per reading documentation, i only see the dual-band antenna option for this device. i am planning to use this for mulch-site bridging. can i substitute the dual-band antenna with a single-band high gain antenna for such deployment?
I have a Cisco Aironet 1242G and an outdoor omni 12 dbi antenna. I hooked it all up to day (antenna is connected with a 100ft cable). My signal is very disappointing. I have it behind a garage and can only get about maybe 75 foot away and the signal gets very weak.
Is there something that needs to be configured in the aironet? I have enabled external antenna and played with the settings. Is the 12 dbi antenna just too much?
we have a couple of AP1262N-E-K9 APs with firmware version 12.4(25d)JA1 operating in autonmous mode. One AP is setup as repeater while all others are in root mode.
The repeater has setup one parent MAC address so it associates every time to the same parent root AP. Given this setting, I am logging into the repeater via SSH and start the antenna-alignment scan: "dot11 dot11Radio 0 antenna-alignment timeout 4"
During this scan, the repeater disconnects from its parent to perform the scan so no output is visible at the SSH console. After the scan is finished, the repeater re-associates to its parent and some output appears on the SSH console.
8 of 10 times this procedure works fine: the scan is finished and I can continue entering commands on the SSH console. However, in some cases the repeater is not reachable any more for about 7 minutes. I.e. pings to the repeater's IP address are unsuccessful and the SSH connection hangs until it is automatically disconnected after a timeout. Also, the web configuration interface is not reachable. After about 7 minutes everything works fine.
We have a Cisco 881 router, which is crashing. We have seen that the ARP cache fills up so much it causes things to crash, our phones go down.. We dont know why this however IP CEF seems to be doing it, when we disable it goes away however disabling IP CEF causes our L2TP tunnel to become inoperable also. So why does IP CEF cause thousands of AR entries and how can we limit that!? Below is the error, sample of the ARP cache and our config. You will notice we also have a /31 given to us on WAN interface, this was given to us by our service provider. This is really strange I cant find other examples on internet.
The error:
Nov 1 04:21:57.474: %SYS-2-MALLOCFAIL: Memory allocation of 65536 bytes failed from 0x81F083F4, alignment 16 Pool: Processor Free: 55176 Cause: Not enough free memory Alternate Pool: I/O Free: 2352 Cause: Not enough free memory
I'm reading this definition in the cisco T-shoot student guide:
"Align-Err: this is the number of frames with alignment errors, which are frames that do not end with an even number of octets and have a bad cyclic redundancy check"
I don't understand what "frames that do not end with an even number of octets" actually means. Did they mean even number of bits? or does a frame's lenght need to be an even number for it to be considered valid?
I am replacing an older AP with a new 1252 unit. I attached everything and powered it up, but my DHCP server does not appear to be finding it and assigning an IP address. The status light stays green and the ethernet light blinks randomly green. Seems to be connected fine, but without an IP I cannot configure it to use it.
How can i connect my laptop (11n supported) to LAP 1252 with WLC 7.0.116.0?Status: 11a enabled on wlcDCA channel list in 11a on wlc is showing only 149 153 157 161 channels.
I have a lightweight AP that boots into RoMmon, if i hold the reset button in for 10 seconds or so it will boot into the IOS and download the config from the controller but never registers. then once i reboot it it goes back to Romon unless i hold in the button again.
Is it possible to Change IOS of 1252 LWAP AP to Autonomous AP? I have seen some documents for changing Autonomous AP to LWAP and change back procedures.
we want to have full wireless coverage in a big warehouse (120mx90m) and 15 meter Height that will be having big racks (14 meters height) and 2 meter between the racks and the rack itself is 1.5 meter (2 rack back to back), now we will be having scanners and we need to make sure the wireless is covering everywhere.Where is the best place to put the AP, Ceiling? How Many APs per row ? each row will be around 60 meters length.
Is AP 1252 a good choice? The scanners are a/b/g.What i'm thinking of is to put 1 AP per row mounted on the ceiling and antennas facing down because it is hard to mount the APs between the rack because of the automated racking system.
Currently my company has 1 primary SSID that is used throughout both floors of the building. We have 1252 LAPs which have 2.4 and 5Ghz antennas. I'm not sure if this issue is only with XP or perhaps it's the computer's drivers but we run into problems with end users going to a different location and having a very weak signal or nothing at all, yet coverage is fine. I believe the problem is the end user's machine selecting the strongest signal and it I have the feeling that switching bands isn't being done as it should when it's in range. So my question,
Should I split up our 1 SSID and created multiple SSIDs according to the location and include 5Ghz or 2.4Ghz in the SSID name so it's easier to ensure that users are connected to the proper signal? I want to ask if multiple SSIDs would still enable users to freely roam (as long as the ssids are configured) throughout the building without noticing a loss of signal but currently just having 1 SSID isn't really enabling people to freely roam around without connection issues.I don't believe having multiple SSIDs will be useful for the computer's choose their connection any more efficiently but allowing the user to manually see what they're connected to and pick something better according to their location.
I am configuring a mobile van that is used for a mobile health clinic to drive to several locations and when pulling into an allocated parking spot the van will connect via wireless automatically. I am using autonomous 1252 AP's and am considering either briding or workgroup bridging.
The issue I am encountering is that the AP inside a van is a router that has to do DHCP across the wireless and because the ethernet interface between router and AP in the van never goes down the router does not know to re-DHCP. I remember from way back there was an IOS command to track a serial interface and drop the ethernet if the serial link goes down. Is there an equivalent command for AP's to drop the ethernet interface if the radio interfaces go down?
I found a few older forum posts and documents online discussing how to create multiple SSIDs on 1 1252 AP using the WLC and they state that VLANs are needed for the interface and then I've read that multiple SSIDs on 1 interface are also possible. I'm not sure on how to actually configure this. I would like my 2.4Ghz radio on the 1252 to be associated with the current SSID in production and the 5Ghz band associated with another SSID that's in production. I couldn't find an option in the WLC or anything stated in the documents I've read about how to associate the radio band with the SSID.
We are using WiSM WLCs and WCS to control a variety of 1131,1142 and 1252 APs utilising AP groups.
I've noticed on WCS that the power of certain APs is at a low setting, even though the APs surrounding them are also at a low setting. This is causing some gaps to appear on the heatmaps. I was under the impression that the WLCs would regulate the AP power to compensate for any gaps. Currently the global TX power level assignment method algorithm is set to automatic every 600 sec.
Now, obviously I could change this to fixed (not ideal as I may not want all my APs to run at max power all the time) or to on demand (also not ideal due to the increased admin).
Is there a way I can verify that the automatic power levels are adjusting as they should? Why are there gaps appearing in my heatmaps?
*NB It's not just the gaps on the heatmaps, I'm getting reports of dropping wireless signals from users hence me looking at the heatmaps and they just happen to correspond.
I have two 1252ag wireless access points running in lightweight mode, and connected to a 2006 wlc. They were both running fine until this morning. One of the 1252s won't stop rebooting itself. I consoled in, and this was the output -
*Mar 1 00:00:32.055: %LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER *Mar 1 00:00:32.055: %LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLER *Mar 1 00:00:32.055: %LWAPP-5-CHANGED: LWAPP changed state to DISCOVERY [ code].....
IOS Boot loader - Starting system. X modem file system is available. I'm particularly curious about this line -
*Mar 1 00:00:50.283: %SYS-4-PUPDATECLOCK: Periodic Clock update with ROMMON failed, because size left in ROMMON (4294967295), size needed (29), error code (-1)
The only reference to it I found online was a very vague "It's a hardware failure", but no further explanation.
I have two 1252s on ports 1 and 2 off a Catalyst 3550. No other device on the switch except the fiber uplink.
Initially 1252 #2 (on port 2) resets for no reason at no specific time. We did not have a problem with 1252 #1.
The show ver on #2 does indicate that equipment resets due to power. I figured the 3550 is having problems powering two 1252s so had this AP on PWRINJ4 (validated its not drawing power via show power inline).
Today, #2 does not reset. However, now #1, which is the only device using inline power is now resetting. Same thing, reset due to power. Same weird behavior, at no particular time.
I've also have "no cdp enable" out off each port as i understand CDP sometime cause device to not boot up (15w versus 15.4w issue).
I have three Autonomous AP´s in a small office running voice applications, all of them are connected to the same infrastructure switch and they have same configuration, voice Vlan is configure to open authentication. I have two models of AP 1252 and 1262 and I paste Radio configuration below.
First issue: During calls users are facing problems when roaming between AP´s, and eventually calls are dropped. Second issue: Sometimes one of these AP´s(1252) lose all transmit signal and when return I got authentication error on log.
