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
[email protected]
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:[email protected]] On Behalf Of Dan Brisson
Sent: Tuesday, January 31, 2012 8:30 AM
To: [email protected]
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
[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/.
**********
Participation and subscription information for this EDUCAUSE Constituent Group
discussion list can be found at http://www.educause.edu/groups/.
