We have seen this on a much smaller scale with some Cisco wireless APs.
The general repair for us was two-fold: some older APs had capacitors
starting to swell and new devices had trouble with newer firmware
upgrades. We backed out the firmware upgrades and these seem to have
settled down.
We have gone to Ruckus in our dorms due the way the APs handle rogue
devices and other interferences (wireless controllers, remote controls
for tvs, microwaves, wireless printers, etc.) The switch seems to have
dramatically stopped most of our complaints in the dorms.
Harry Rauch Sr. Network Analyst Eckerd College 4200 - 54th Ave S St.
Petersburg, FL 33711
On 10/22/11 6:52 PM, Ghere, Shayne wrote:
Hello,
We currently provide wireless for all our Dorms using Cisco 1142N
AP's, 1 WCS and 3 WLC5508's. We have roughly 375 AP's in the dorms
but more than 450 rogue AP's that the students brought with them.
Since we have no policy to disallow them bringing their own devices,
we now have a mess.
What we're seeing are the AP's either completely rebooting, radios
shutting down then coming back up, or if the students are able to
connect they get dropped after a few minutes.
On the Academic side of the University we don't see this problem,
however all the AP's are disassociating with the controllers every
hour, then reassociating again.
The WLC's are running 7.0.116.0 and the WCS is running 7.0.172.0. It
appears that since upgrading the controllers to 7.0.116.0 the problems
started with the disassociating/reassociating with no explanation.
We are using WS-C2960S-PoE switches fibered to the core (6509) and
have spent almost 28 hours on the phone with Cisco Tac looking at
logs/packet captures and configuration review. Nothing is
misconfigured and the packet captures show the following from one of
the AP's:
Oct 19 20:55:54.918: %CAPWAP-3-EVENTLOG: Retransmission Count= 3 Max
Re-Transmission Value=3
*Oct 19 20:55:54.918: %CAPWAP-3-EVENTLOG: Max retransmission count
exceeded going back to DISCOVER mode.
*Oct 19 20:55:54.918: %CAPWAP-3-EVENTLOG: The function which Posted
the message to send out of the box is wtpSendEchoReques and of Type=1
., 1)19 20:55:54.918: %CAPWAP-3-EVENTLOG: Retransmission count for
packet exceeded max(CAPWAP_ECHO_REQUEST
*Oct 19 20:55:54.918: %CAPWAP-3-EVENTLOG: GOING BACK TO DISCOVER MODE
*Oct 19 20:55:54.962: %DTLS-5-SEND_ALERT: Send FATAL : Close notify
Alert to 136.176.x.x:5246
*Oct 19 20:55:54.962: %CAPWAP-3-EVENTLOG: CAPWAP State: DTLS Teardown.
*Oct 19 20:55:54.963: %CAPWAP-3-EVENTLOG: DTLS session cleanup
completed. Restarting capwap state machine.
*Oct 19 20:55:55.006: %WIDS-5-DISABLED: IDS Signature is removed and
disabled.
*Oct 19 20:55:55.008: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
*Oct 19 20:55:55.008: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
*Oct 19 20:55:55.063: %LINK-5-CHANGED: Interface Dot11Radio0, changed
state to administratively down
*Oct 19 20:55:55.063: %LINK-5-CHANGED: Interface Dot11Radio1, changed
state to administratively down
*Oct 19 20:55:55.065: %CAPWAP-3-EVENTLOG: CAPWAP state not up. Abort
sending channel and power levels info.136:176:x.x
*Oct 19 20:55:55.074: %LINK-5-CHANGED: Interface Dot11Radio0, changed
state to reset
*Oct 19 20:55:55.075: %CAPWAP-3-EVENTLOG: CAPWAP state not up. Abort
sending channel and power levels info.136:176:x.x
We're completely at a loss since none of the switch ports, trunk ports
or the WLC's are showing dropped packets.
Has anyone run into this problem and found a work around?
I would greatly appreciate any help in this matter!
Thanks
Shayne
-----------------------------
*/Bradley University/*
T. Shayne Ghere, CCNA
Network Engineer
1501 W. Bradley Ave.
Morgan Hall, Suite 205
Peoria, IL 61625
sgh...@bradley.edu
(309) 677-3094 ofc.
(309) 677-3460 fax
*/Class 2011 FBI CA Graduate/*
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