Bear in mind the controllers are designed to remove associations (and save resources) if there hasn't been any traffic seen from the clients. The User Idle Timeout is responsible for this behavior.
You can increase this value from its default of 300s to a higher value. This will keep the (inactive) association active longer. I'm trying to find out from Cisco whether this will preserve L3 roaming for mobile devices that don't issue DHCP renewals effectively. Note this can increase memory utilization and will adversely impact location-by-association. BTW, here's an example of the radio reset syslog messages I'm seeing from the APs. Looks like it might be related to another control-plane management function like the aforementioned TSM. Only the b/g radios are affected. 10-08-2008 18:28:46 Local7.Error 172.20.42.198 17333: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:28:45 Local7.Error 172.20.42.198 17332: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:28:40 Local7.Error 172.20.42.198 17331: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:28:40 Local7.Error 172.20.42.198 17330: AP:0016.465a.884c: %SYS-3-MGDTIMER: Running timer, init, timer = A0786C. -Process= "LWAPP 802.11 MAC Management Reception", ipl= 0, pid= 37 -Traceback= 0x5DCB8 0x15F194 0x15F300 0x15F490 0x46F17C 0x46D0E0 0x46D4C4 0x46D5BC 0x193F50 10-08-2008 18:28:39 Local7.Error 172.20.42.198 17329: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:12:20 Local7.Error 132.183.112.28 16239: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:12:19 Local7.Error 132.183.112.28 16238: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:12:14 Local7.Error 132.183.112.28 16237: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:10:42 Local7.Error 172.20.42.143 101: AP:001e.be27.017e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:10:42 Local7.Error 172.20.42.143 100: AP:001e.be27.017e: %SYS-3-MGDTIMER: Running timer, init, timer = D382B4. -Process= "LWAPP 802.11 MAC Management Reception", ipl= 0, pid= 42 -Traceback= 0x5DCB8 0x161FBC 0x162128 0x1622B8 0x4C32FC 0x4C1260 0x4C1644 0x4C173C 0x196D90 10-08-2008 18:10:41 Local7.Error 172.20.42.143 99: AP:001e.be27.017e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:10:36 Local7.Error 172.20.42.143 98: AP:001e.be27.017e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:10:35 Local7.Error 172.20.42.143 97: AP:001e.be27.017e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:07:40 Local7.Error 172.20.42.198 17328: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:07:39 Local7.Error 172.20.42.198 17327: AP:0016.465a.884c: %SYS-3-MGDTIMER: Running timer, init, timer = A07D7C. -Process= "LWAPP 802.11 MAC Management Reception", ipl= 0, pid= 37 -Traceback= 0x5DCB8 0x15F194 0x15F300 0x15F490 0x46F17C 0x46D0E0 0x46D4C4 0x46D5BC 0x193F50 10-08-2008 18:07:39 Local7.Error 172.20.42.198 17326: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:07:34 Local7.Error 172.20.42.198 17325: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:07:33 Local7.Error 172.20.42.198 17324: AP:0016.465a.884c: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:00:20 Local7.Error 132.183.112.28 16236: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:00:19 Local7.Error 132.183.112.28 16235: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down 10-08-2008 18:00:14 Local7.Error 132.183.112.28 16234: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up 10-08-2008 18:00:13 Local7.Error 132.183.112.28 16233: AP:0015.fa05.a54e: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL PROTECTED] On Behalf Of Todd Lane Sent: Wednesday, October 08, 2008 6:24 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Cisco Wireless Controller We've been running a "Engineering Special" version of 4.2.130.0 since August and it's been stable so far. We had several problems with 4.2.185.0 including controller reboots and lockups. The general release version of 4.2.130.0 fixed all the major problems we were seeing except two and the engineering special took care of those. We're just starting to get reports from clients with random disconnects. --Todd Mike King wrote: > So Cisco LWAPP people, > > Currently we're on 4.1.185.0 <http://4.1.185.0>. It's a 4402 controller, > with 1131AG access points. > > Anyone made the leap to one of the 4.2, 5.0 , or 5.1 trains without > seriously regretting it? > > We've had some random disconnects with clients. It's pretty common, > happening to most all users. We're running WPA-PSK, so it's not an > 802.1x issue. Before we involve TAC, we figured we should upgrade to a > new code train. > > Mike > ********** 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/. The information transmitted in this electronic communication is intended only for the person or entity to whom it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this information in error, please contact the Compliance HelpLine at 800-856-1983 and properly dispose of this information. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
