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Wireless LAN Controllers WLCRelated Network Devices. Components Used. This document is not restricted to specific software and hardware versions. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration. If your network is live, make sure that you understand the potential impact of any command. Note The intended audience for this document are experienced wireless network engineers and administrators who are already familiar with the use, configuration and troubleshooting of these topics. Background Information. It can be common to find that given the various client devices that both exist and continue to be developed. A variety of issues can arise with regards to establish, maintain, or simply to get the most out of their connection to the wireless network and to support infrastructure. This can often come down to a simple configuration issue on the part of the client device andor the wireless infrastructure itself. However, in some cases this can be attributed to an interoperability issue with regards to a specific client device and components that support it i. WLAN adapter, wireless driver, etc., andor the APs in question. As wireless engineers, such interoperability issues pose an opportunity to identify, troubleshoot, and resolve potentially complex challenges. Additional information to what is outlined in this article might be requested and needed to be collected on a case by case basis, given the unlimited number of variables that might dictate such requirements. However, the information detailed here is a generic guideline to address any potential wireless client interoperability issue. I. Problem Definition. The first step to effectively approach any problem with the intent to get resolute, is to accurately define the issue at hand. To do so, ensure that at a minimum of these questions are asked and their answers are clearly documented Is the issue restricted to a specific model of APs andor radio type i. GHz versus 5 GHzIs the issue observed only on specific versions of WLC software Is the issue experienced with only specific versions of client types andor software i. OS version, WLAN driver version, etc. Are there any other wireless devices which do not experience this issue If so, what are they Is the issue reproducible while the client is connected to a simplified wireless setup such as an open SSID, with a channel width of 2. MHz, and 8. 02. 1. If the issue is not reproducible with an open SSID, at what minimum security configuration is the issue seenPSK or 8. What Is Rtp File Extension on this page. X on the WLAN. What were the previous working configuration and software versions II. WLC Configuration And General Logs. Run Config. Without exception, it is of absolute necessity to collect the customers WLC configuration for a detailed review of features used by the customer, their specific setup, and other such details. To do so, you must establish a TelnetSSH session to the WLCs in question and save the output of these CLI commands to a text file config paging disable. The full run config output is always preferred, as it includes detailed information with regards to the joined APs and associated RF information, etc. Though in some cases and situations, such as when you initially work with a WLC with a large number of APs joined i. WLC with 2. 50. 0 APs. It might be preferred to initially collect just the configuration of the WLC without such AP information for quick review, as the full show run config might take 3. APs. However, it might still be needed to collect the full run config output at a later time. To do so, you can optionally collect the output of these CLI commands to a text file config paging disable. WLC Configuration File. In addition to either the show run config or show run config no ap output, it is also recommended to collect a full backup of the WLC configuration as well. This is of assistance, if a lab recreate needs to be conducted by both TACHTTS and BU Escalation, to try and reproduce the customers issue in a Cisco lab environment. A backup of the WLC can be collected via the GUI or the CLI of the WLC in question, with the use of either TFTP or FTP to save the configuration file to the external TFTPFTP server. The below example shows the usage of both the GUI and CLI to save a backup of the WLC, with the use of TFTP GUICommands Upload File Configuration Upload as shown in the image. CLItransfer upload datatype configtransfer upload mode tftp. TFTP ServerIP address. Syslogs from the WLCAt this time, you also want to collect the current logs from the WLC for additional review as needed. Ideally, you want to collect these logs immediately after your test with a wireless client whereby the reported issue is reproduced. If the customer exports the WLC logs to an external syslog server, then you want to retrieve them from there. Otherwise, you can save the msglog and traplog currently stored locally on the WLC by saving this CLI session output to another text file config paging disable. III. Client Device Details and Information. The next step is to gather as much information and specifics with regards to the client devices in use that experience a potential wireless interoperability issue. Such information should include, but is not necessarily limited to these Client type i. PC, etc. Device make and model. OS version. WLAN adapter model. WLAN adapter driver version. Supplicant used i. Windows Zero Config Auto Config, Intel PROSet, etc. Security configured for use by the wireless client and WLAN i. Open, PSK, EAP PEAPMSCHAPv. Note Any client parameters changed from default settings provided by the vendor in question i. U APSD, etc. Note Any additional information or notes with regards to the client devices up to which includes screenshots of its WLAN related configurations, and so forth must also be included as needed. IV. Network Topology. To further expedite troubleshooting efforts and the Root Cause Analysis RCA process, it is always recommended to provide a detailed and thorough network topology diagram. The network topology diagram should not only include details about the network and wireless infrastructure, but also provide an insight into the wireless devices in question which operates within the network i. VLANs are in use, etc. A number of tools i. Microsoft Visio, draw. The important aspect is to simply ensure that the proper information is clearly reflected in the diagram provided for review by all involved parties and vendors. An example network topology that captures basic, but useful information with regards to both the infrastructure and client devices as shown in the image. V. Track Additional Details and the Specifics.