More info about the "Fast SSID" feature.. This is TAC's answer about why it is disabled by default: "It is disabled by default as a protection mechanism against DoS attacks from malicious clients."
--- Dennis Xu Network Analyst, Computing and Communication Services University of Guelph 5198244120 x 56217 ----- Original Message ----- From: "Dennis Xu" <d...@uoguelph.ca> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Sent: Tuesday, September 13, 2011 10:36:45 AM Subject: Re: [WIRELESS-LAN] Wi-Fi connection issue when switching SSIDs Thanks Jimmy! "Fast SSID change" was disabled (default) on my controllers. I enabled it and did a few tests. That seems to have fixed the issue! --- Dennis Xu Network Analyst, Computing and Communication Services University of Guelph 5198244120 x 56217 ----- Original Message ----- From: "James Helzerman" <jarh...@umich.edu> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Sent: Tuesday, September 13, 2011 10:10:18 AM Subject: Re: [WIRELESS-LAN] Wi-Fi connection issue when switching SSIDs Hi. Do you have "Fast SSID change" enabled on your controllers? This setting is under Controller--> General. If it is not enabled, enable it and see if you performance improves. I was told by our SE on 7.0.98.0 code that this is to help with that issue. My understanding to it is the controller will cache the user for a small period of time to see if they come back on that SSID. Their MAC address is in limbo for this time and cant connect to any other SSIDs on that controller. When "Fast SSID change" is enabled this tells that controller not to stop that MAC address from connecting on any SSID. I hope this helps, -Jimmy James Helzerman Wireless Network Engineer University of Michigan ITS Communications Systems and Data Centers 4251 Plymouth Road, Building 2, #2224 Ann Arbor, Michigan 48105 Phone: 734-615-9541 Cell: 734-972-5095 -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dennis Xu Sent: Tuesday, September 13, 2011 9:59 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Wi-Fi connection issue when switching SSIDs Hi everyone, we have Cisco WiSMs 7.0.116.0 and we see a connection issue in our environment. When users disconnect from one SSID and connect to another SSID, most of times they need to try 2-3 times then got connected. It seems to consistent for IPhone users, but also happens some times for Windows especially when switching from open SSID to 802.1x SSID. This only happens when switching SSIDs. Has anyone else seen this issue? Thanks. --- Dennis Xu Network Analyst, Computing and Communication Services University of Guelph 5198244120 x 56217 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
