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- About daviwatk
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Member since
08-23-2011
164
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Created by
daviwatk
in Wireless and Mobility
in Wireless and Mobility
12-20-2012
12:58 PM
12-20-2012
12:58 PM
Also the same data sheet referenced by original poster reflects the channel widths/etc showing 2.4GHz doesn't include 40MHz. While it does show that there is a 300Mbps maximum PHY rate (which is true); it's under particular configurations/circumstances. ie. 40MhHz 802.11n on 5GHz with client adapters that have minimum of 2 spatial streams, given all other necessary 802.11n requirements: WPA2/AES or Open, WMM enabled. Notice in the same data sheet 40MHz is not referenced in 2.4GHz whether b/g or n, however in the 5GHz, we see 40MHz listed in 802.11n. Maximum Number of NonOverlapping Channels 2.4 GHz ● 802.11b/g: ◦ 20 MHz: 3 ● 802.11n: ◦ 20 MHz: 3 5 GHz ● 802.11a: ◦ 20 MHz: 21 ● 802.11n: ◦ 20 MHz: 21 ◦ 40 MHz: 9 Given you're achieving 144Mbps (MCS 15); you're getting the max data rate achievable on an 114 1 AP; ie these clients "do" have two spatial streams, however your AP doesn't support channel bonding to double that throughput sinc you don't have a 5GHz radio.
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Created by
daviwatk
in Wireless Security and Network Management
in Wireless Security and Network Management
12-20-2012
09:35 AM
12-20-2012
09:35 AM
Making it easy on him eh? Good call Scott.
... View more
Created by
daviwatk
in Wireless and Mobility
in Wireless and Mobility
12-20-2012
09:30 AM
12-20-2012
09:30 AM
You cannot configure channel bond on 2.4GHz; this is explained in the document linked via the answer marked "correct" and is in quotations below. I suppose it's feasible his AP is running a much older IOS release, but it looks like a 12.4 release Temur: Can you provide the exact IOS version you are running? Roger Alderman wrote: Lets get things into perspective on this discussion. The AP is an 802.11g/n device so yes it does only have a 2.4GHz radio. However, providing the AP supports it there is absolutely nothing to say you can't bond channels in 2.4GHz. "Cisco does not support channel bonding in 2.4 GHz frequency (802.11 b/g), because only three non-overlapping channels 1, 6 and 11 are available." How Does 802.11n Provide Greater Throughput Various techniques are employed in 802.11n to provide higher data rates and better coverage. This section details the techniques used. MIMO: In the existing 802.11 a or 802.11 b/g technologies, transmission and reception of data streams usually happen using only one of the antennas. However, in 802.11n data streams can be transmitted and received over both the antennas. This results in a greater number of bits transmitted and received at a given point of time, effective usage of multipath signals which is usually a problem in indoor coverage. This leads to increased throughput and wider coverage. Table 1 shows the data rates of 802.11n currently supported by Cisco 1 . MCS 0-7 are the data rates achieved using single spatial stream (data bits). MCS 8-15 are the data rates achieved using 2 spatial streams, one over each antenna. Note that the data rates are doubled from 8-15. These data rates (0-15) are described as MCS rates throughout this document. Note: 1 Further higher data rates are planned for future deployments. Channel Bonding: The amount of data that can be transmitted also depends on the width of the channel used in data transmission. By bonding or combining two or more channels together, more bandwidth is available for data transmission. In 2.4 and 5 GHz frequency band, each channel is approximately 20 MHz wide. In 802.11n, two adjacent channels, each of 20 MHz are bonded to get a total bandwidth of 40 MHz. This provides increased channel width to transmit more data. Cisco does not support channel bonding in 2.4 GHz frequency (802.11 b/g), because only three non-overlapping channels 1, 6 and 11 are available. However, the channel bonding has more relevance in 5 GHz frequency range where you have as many as 23 adjacent non-overlapping channels currently available. Channel bonding is supported only in 5 GHz, for example 802.11a. Table 2 shows the data rates achieved through channel bonding.
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Created by
daviwatk
in Wireless Security and Network Management
in Wireless Security and Network Management
12-19-2012
03:59 PM
12-19-2012
03:59 PM
While a bit cumbersome; it's feasible. It would require some legwork and post-collection formatting. From the CLI... To see list of AP names and IPs you could perform >show dtls connections Any AP that has CAPWAP control path up (joined to WLC) would appear here with AP name and "Peer IP" For pulling serial number; this is pretty tedious, but you could script this out You would need to execute the following for each ap >debug ap enable >debug ap command "show ver | inc Serial" May even try "PCB Serial Number" as the "include" for relevant SN You will get some extra outputs regarding the WLC task, timestamps, and MAC, but you will see the value of this "command" returned to the WLC screen afterwards. Again, this isn't pretty, but can it be done; yes. Leo's suggestions would be much easier
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
10-22-2012
10:39 AM
10-22-2012
10:39 AM
It would be best to start by providing a client debug so we can see the issue. You're describing two different issues: not being able to "connect" vs not being able to "get an ip address". You mention a solid green light which would indicate no clients are associated, however they "can" connect right after the AP is rebooted, but then disconnect when renewing their release after 5 seconds? That doesn't quite add up. So if a client gets an IP, they disconnect in 5 seconds, or they just don't get an IP? Start a client debug on the WLC's CLI, log the outputs, and post them here when finished 1. >config paging disable 2. >debug client Get the debug going and then try to connect one of your clients. Post what outputs you collect. Give the client 30 seconds to a minute of trying so we can see what kind of behavior is taking place.
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
10-16-2012
08:56 AM
10-16-2012
08:56 AM
TPC could certianly help out. If you have added even more APs and are still maxing power at one, you are probably pretty hot. TPC will make the "best" choice in regards to power levels. Please also consider the maximum transmit power of your clients. Maxing the AP out to reach your center aisle could have zero effect (and mostly negative) if your clients have a max 50mw transmit power; just as an example. the AP needs to hear your client, so I wouldn't depend on your client having "more bars" as indication of proper performance for that client. The interference appears to be BT due to the FHSS CU sequencing, which is a concern, but the power level assignments could be doing more harm than these. Without a site survey it's anybody's guess what's best for your environment. Again, a run-config would go a long ways in making suggestions for you.
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
10-15-2012
09:14 PM
10-15-2012
09:14 PM
Hi Srini, It's tough to tell you what changes to make without seeing your current run-config so we can see the total RF snapshot of your environment. The spectrum analyzer look mostly like BT, but maybe some DECT phones as well since you mentioned. Several topics above are quite valid regarding channel utilization but be sure to consider the specific requirements of the clients you are servicing before making changes relative to their communication. I'm not sure what version you were running the last time you used the WLCs RRM features, but this is really probably your best bet, but may require some tweaking. With those 8.5dbi antennas maxed at power level one, you may be overpowering your environment, but I can't say for sure without run-config. I would usually suggest the WLC's RRM defaults a starting baseline. I'm not sure what version your last RRM experience was with, but this is quite a polished solution. You may need to make various changes, but you can get a better understanding of the current RF based upon the WLC's choices. For instance, if you set all RRM to Defalut and Auto and after several intervals you find your power levels dropping to 4, 5, and so on, you would immediately know that your manual power assignment is severely impacting the RF with co-channel interference. Given your description, I wouldn't suspect your power levels would stay at levels 1 and 2, but can't say for sure without current run-config.
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Created by
daviwatk
in Wireless and Mobility
in Wireless and Mobility
10-07-2012
08:38 PM
10-07-2012
08:38 PM
I wouldn't think simply having CleanAir enabled would be a problem as it can still be used for reporting of AQ and other useful information about non-WiFi interferers, but you may not want to enable Event Driven RRM.
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10-02-2012
10:58 PM
Have you tried loading the Sept. 4 release LWAPP recovery image? c1130-rcvk9w8-tar.124-25e.JAL.tar You may also need to disable ssc hash validation via the vWLC CLI for the 1130 APs. >config certificate ssc hash validation disable
... View more
10-02-2012
10:37 PM
From vWLC Config Guide http://www.cisco.com/en/US/products/ps12723/products_tech_note09186a0080bd2d04.shtml Console port setup for (5.1ESXi example): http://www.cisco.com/en/US/products/ps12723/products_tech_note09186a0080bd2d04.shtml#port This will default your console to the specified telnet:// : as described in the example. Also Note: Only one mode of console can be operational at any time, such as a VM console (by key-interrupt at startup) or serial console (physical/network). It is not possible to maintain both at the same time. Otherwise; if you don't catch the "press any key" screen, you're stuck without console access until you reboot and try again.
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Created by
daviwatk
in Wireless Security and Network Management
in Wireless Security and Network Management
09-27-2012
12:19 PM
09-27-2012
12:19 PM
Do you now the results testing with IE or Chrome (any version). I have found that the WLC's SSC can have issues at times and may need to be re-generated. I presume you can take you "same machine" and just open the older browser and get to the page, but 15.0.1 firefox will not. Lets assume that; otherwise there could be many other issues. A packet capture on the client would show the failure problems. I have found that when in this "scenario" IE and Chrome both FIN ACK and end their TLSv1 handshake due to "invalid certificate" or certificate issus. When this happens both Chrome and IE would not get the page, however FireFox always would; it seemed to just "ignore" the problem. Maybe the new FireFox version is more sensitive. You may need to regenerate your WLC SSC for WebAuth by going to SECURITY > Web Auth > Certificate > "Regenerate Certificate". You will need to reboot if you do this.
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
09-04-2012
12:38 PM
09-04-2012
12:38 PM
Do you know if you are using Event Driven RRM? It's possible there is aggressive channel changes taking place on the 3502, where-by your client would be deauthenticated (then most likely roam to next best candidate/other AP you mentioned). Do you have any inteferers detected by the 3502i AP in question? MONITOR > CleanAir > 802.11a/n or 802.11b/g/n > Interference Devies and AirQuality Report. Is Event Driven RRM enabled? WIRELESS > 802.11b/g/n or 802.11a/n > DCA > "Event Driven RRM" If this is on, I would suggest turning it off, unless you have a full CleanAir deployment. Whether you let CleanAir force an immediate channel change due to AirQuality (and only on the CleanAir capable AP will it change immediately, as the others will only change once an RRM/DCA interval is reached), or you suffer with interference, it could lead to a client disconnect. The client should be able to re-associate immediately upon channel change, but may just move over to the next heard AP (a ways away) as you described. If the debug truly only shows the entries in the original post, it would be helpful to have a wireless sniff on the APs channel along with another debug (started before the client ever associates). Channel changes would be reported in the traplog of the WLC, so you can look at your traplog through the GUI or ">show traplog" on CLI and parse for channel changes. Since 7.2 allows 2 clients to be debugged, you may enable debug client for AP and the Client, and then turn on RRM debug for DCA >debug airewave-director channel or for more extensive RRM info >debug airewave-director all I'm not sure how this will behave (ie, if it will only show RRM details for the AP specified in the 2nd debug client-- you would just have to try and see.) You can also enable telnet/ssh to the AP and directly run (these "should" work) #debug dot11 mgmt station #debug dot11 mgmt msg #debug dot11 mgmt state-machine
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
09-04-2012
11:57 AM
09-04-2012
11:57 AM
Amjad's response is the correct answer, this will not work the way you have described. In the scenario you have described, using local switching, these wireless clients are not having their traffic processed centrally, therefore the WLC will not provide a DHCP offer to the clients. The DHCP request hits the local network segment and the gateway unicasts the DISCOVER to the WLC if using that as helper, but the WLC will ignore this because it's not coming "in" via traditional CAPWAP client traffic from an AP centrally switching traffic. Pointing to a different DHCP server should work just fine as you described. If you "require" DHCP to be handled on the WLC, then these either need to be local mode APs, or "centrally" switching the traffic for the H-REAP/FlexConnect APs.
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Created by
daviwatk
in Other Wireless - Mobility Subjects
in Other Wireless - Mobility Subjects
09-04-2012
11:15 AM
09-04-2012
11:15 AM
Can you post the entire client debug you have so we can see what events are taking place prior to the client being deauthenticated message. It seems like this could be possible RRM channel change or some other AP "event"; maybe even an idle timeout or re-transmissions, maybe broadcast key roation? (Cleaning up state for STA 68:a8:6d:15:e2:54 due to event for AP e8:ba:70:61:45:80(0)) -- "due to event for AP". Also, what model and what mode are these APs running in? Local/FlexConnect? If Flex, are you local switching?
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06-23-2012
01:26 PM
Definitely "seems" like you have a lightweight image on the AP. the "model" if that's in fact the exact model number: AIR-AP1131AG would indicate stand-alone, however from what you've described it must have lightweight image on it. You will not be able to telnet/ssh/gui manage the AP in lightweight unless telnet/ssh enabled at WLC first. So, to "verify", you should run a "show ver" from the AP console. If you're image has a k9w7, it is standalaone. k9w8 would indicate a lightweight version. ie. Stand-alone for 1131: c1130-k9w7-tar.124-10b.JA3.tar Lightweight for 1131: c1130-rcvk9w8-tar.124-10b.JDA.tar You can use the information here to properly convert: http://www.cisco.com/en/US/docs/wireless/access_point/conversion/lwapp/upgrade/guide/lwapnote.html#wp160918
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Created by
daviwatk
in Wireless and Mobility
12-20-2012
12-20-2012
Also the same data sheet referenced by original poster reflects the
channel widths/etc showing 2.4GH...
Created by
daviwatk
in Wireless Security and Network Management
12-20-2012
12-20-2012
Making it easy on him eh? Good call Scott.
Created by
daviwatk
in Wireless and Mobility
12-20-2012
12-20-2012
You cannot configure channel bond on 2.4GHz; this is explained in the
document linked via the answer...
Created by
daviwatk
in Wireless Security and Network Management
12-19-2012
12-19-2012
While a bit cumbersome; it's feasible. It would require some legwork and
post-collection formatting....
Created by
daviwatk
in Other Wireless - Mobility Subjects
10-22-2012
10-22-2012
It would be best to start by providing a client debug so we can see the
issue. You're describing two...
Created by
daviwatk
in Other Wireless - Mobility Subjects
10-16-2012
10-16-2012
TPC could certianly help out. If you have added even more APs and are
still maxing power at one, you...
Created by
daviwatk
in Other Wireless - Mobility Subjects
10-15-2012
10-15-2012
Hi Srini,It's tough to tell you what changes to make without seeing your
current run-config so we ca...
Created by
daviwatk
in Wireless and Mobility
10-07-2012
10-07-2012
I wouldn't think simply having CleanAir enabled would be a problem as it
can still be used for repor...
10-02-2012
Have you tried loading the Sept. 4 release LWAPP recovery image?
c1130-rcvk9w8-tar.124-25e.JAL.tarYo...
10-02-2012
From vWLC Config Guide
http://www.cisco.com/en/US/products/ps12723/products_tech_note09186a0080bd2d0...
09-27-2012
Do you now the results testing with IE or Chrome (any version). I have
found that the WLC's SSC can ...
Created by
daviwatk
in Other Wireless - Mobility Subjects
09-04-2012
09-04-2012
Do you know if you are using Event Driven RRM? It's possible there is
aggressive channel changes tak...
Created by
daviwatk
in Other Wireless - Mobility Subjects
09-04-2012
09-04-2012
Amjad's response is the correct answer, this will not work the way you
have described. In the scenar...
Created by
daviwatk
in Other Wireless - Mobility Subjects
09-04-2012
09-04-2012
Can you post the entire client debug you have so we can see what events
are taking place prior to th...
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| Date Registered | 08-23-2011 06:03 PM |
| Date Last Visited | 08-18-2017 03:55 AM |
| Total Messages Posted | 164 |
| Total Helpful Votes Received | 70 |
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