We have seen this to varying degrees, off and on since early 2006 code. The one TAC case I did open a while back focused on AP switchport configs, spanning tree, CDP, and stuff like that. Wasn't particularly conclusive, and we have always used LAGs to our controllers whether they are WiSM or 5508. Also seem random, although occasionally the same AP will exhibit the behavior across the span of a few days and then magically behave.
Lee H. Badman Wireless/Network Engineer Information Technology and Services Adjunct Instructor, iSchool Syracuse University 315 443-3003 -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Mike Goebel Sent: Wednesday, February 01, 2012 7:41 AM To: [email protected] Subject: Re: [WIRELESS-LAN] Cisco APs losing CAPWAP session If you don't have LAG set up, you get MAC flapping on the switch - check the log on the switch perhaps. I'd have to check the manual, but from what I recall, it's required. I've run multiple 5508s and WiSMs, but always did LAG. Mike On 1/31/2012 7:39 PM, Jeffrey Sessler wrote: > Are the AP's getting their IP addresses from a DHCP server, and if so, > do IP renewals at all correlate to the AP dropping the CAPWAP session? > Jeff > > >>> On Tuesday, January 31, 2012 at 5:29 AM, in message > <[email protected]>, Dan Brisson <[email protected]> wrote: > I'm curious if any Cisco users out there are experiencing or have > experienced what we're seeing on our campus. This past summer we > installed 3502i's in all of our residence halls - approximately 500 > total. Ever since the students have moved in, we will get messages from > WCS stating that "AP XYZ" is down and disassociated from the > controller. When I check out the AP, the uptime is fine, but the > "CAPWAP join time" is for like 30 seconds, or however long it took me to > check. > > We've tracked this and it is totally random as to what AP will drop, > which makes troubleshooting this very tough. The log on the AP isn't > helpful. I'm working with TAC who suggests that keepalives are getting > missed. I'm not sure why that would be the case since we have another > 500 or so APs on the admin side that very rarely drop. Adding to that, > when the students left for break, the AP drops stopped. They came back, > and sure enough, the drops start up again. > > I will say that the AP always joins back immediately, but for the time > that it does drop A) I'm sure connectivity is affected in that area and > B) we get an email. > > Anyone experiencing this? > > Thanks, > -dan > > > -- > Dan Brisson > Network Engineer > University of Vermont > (Ph) 802.656.8111 > [email protected] > > ********** > 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/. > -- Mike Goebel Network Programmer Office of Information Technology Western Michigan University Phone: 269-387-0453 Email: [email protected] ********** 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/.
