Dan, have you tried logging into the AP itself and checking the logs by
chance?
Mike
On 2/1/2012 10:03 AM, Dan Brisson wrote:
It does seem as though I've grabbed some folks attention. I sure hope it
turns out to not be something simple. :)
I could certainly try moving the APs around...easy enough to do,
although from what we've seen, the pattern of AP drops is so totally
random, hard to say if I'll see anything. At this point though, it's
worth a shot.
All interfaces clean and no QoS in place.
Not sure if this will come through for everyone, but here's an example
of what I see after an AP drops. This is from the controller, on the
General tab for an AP:
Thanks,
-dan
Dan Brisson
Network Engineer
University of Vermont
(Ph) 802.656.8111
dbris...@uvm.edu
On 2/1/2012 9:26 AM, Garry Peirce wrote:
I think you have some of us all getting curious! ;-)
Could you put a historically stable admin AP onto the 5508 and vice-versa to
see if behaviors change?
Do we assume that all switchports in the path are showing they're running
clean?
Any QoS config in place on the switches?
-----Original Message-----
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson
Sent: Wednesday, February 01, 2012 9:09 AM
To:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Cisco APs losing CAPWAP session
Good to know.
The trunks are actually all 10Gig links, or 90% of them are, so utilization
is most likely not the case, which I'm able to verify from Cacti graphs.
The APs are connected to 3560Xs PoE switches that then uplink into either a
3560E-12D or directly into a 4900M where the 5508s are connected. Certainly
can't rule out physical layer issue somewhere, although it's so wide spread
across 2 different 5508s that we would need to have multiple issues.
The other interesting thing for us is that the 500 or so APs on our admin
side that do not lose their CAPWAP session, join to WiSMs, not 5508s.
Thanks,
-dan
Dan Brisson
Network Engineer
University of Vermont
(Ph) 802.656.8111
dbris...@uvm.edu
On 1/31/2012 8:44 PM, Garry Peirce wrote:
We have ~1400 (1240s->3502's) running 7.0.116 and have no such issues.
I would guess at packet loss as well - some things you might look at:
Are the trunks carrying user/AP traffic seem congested when the APs drop?
Have you verified there are no duplex issues? It may exhibit itself
more as traffic levels rise.
ResHall switching significantly different than on the admin side?
Probably need further topology, version, config info, but as you've a
case open, the TAC will likely ask the same and help find the culprit(s)
for you.
-----Original Message-----
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson
Sent: Tuesday, January 31, 2012 8:30 AM
To:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Cisco APs losing CAPWAP session
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
dbris...@uvm.edu
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**********
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Mike Goebel
Network Programmer
Office of Information Technology
Western Michigan University
Phone: 269-387-0453
Email: michael.goe...@wmich.edu
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