Make sure 8.2 supports all the APs you have since 8.2 does drop support for some older AP models.
Kevin McCormick <https://www.youracclaim.com/badges/3aa51624-4156-498d-bf6f-4a61790d54cf/public_url> Network Administrator University Technology - Western Illinois University [email protected] | (309) 298-1335 <3092981335> | Morgan Hall 106b Connect with uTech: Website <http://www.wiu.edu/utech> | Facebook <https://www.facebook.com/uTechWIU> | Twitter <https://twitter.com/WIU_uTech> On Mon, Aug 28, 2017 at 11:39 AM, Watters, John <[email protected]> wrote: > TAC has not mentioned 8.0.141.46 (or any other 8.0 version). They would > like for me to move to 8.2. However, school just started. This is not the > time to make a level change. Maybe in a month or so though. > > > > However, I would strongly consider 8.0.141.46 if I could find it (which I > can’t; it is not listed on the Cisco software download site). Maybe my > local Cisco tech can get it for me. I wonder why TAC didn’t even mention it. > > > > Thanks. > > > > > > > > *John Watters* > > Network Engineer, Office of Information Technology > > The University of Alabama <https://www.ua.edu/> > A115 Gordon Palmer Hall > Box 870346 > Tuscaloosa, AL 35487 > Phone 205-348-3992 > [email protected] > > [image: The University of Alabama] <https://www.ua.edu/> > > > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto: > [email protected]] *On Behalf Of *Jeffrey D. Sessler > *Sent:* Monday, August 28, 2017 10:10 AM > *To:* [email protected] > *Subject:* Re: [WIRELESS-LAN] DFS Scans Seem to Have Run Amok > > > > TAC will likely suggest you install 8.0MR5 interim (8.0.141.46) given you > have 2700’s (couple of radio bugs are fixed). DFS is as much art as science > and older code isn’t always perfect i.e. I’ve seen newer devices that much > older code sees as radar. You can request the code here and see the fixes > including a number of DFS-related. > > https://supportforums.cisco.com/t5/wireless-mobility- > blogs/8-0mr5-interim-release-availability/ba-p/3098510 > > > > Probably too late, but you may want to consider getting to newer code. If > you have x700 series WAPs, it’s strongly recommended to be on at least 8.2. > 8.2 and beyond have additional innovation in DFS area among many other > improvements. > > > > Jeff > > > > *From: *"[email protected]" <WIRELESS-LAN@LISTSERV. > EDUCAUSE.EDU> on behalf of "Watters, John" <[email protected]> > *Reply-To: *"[email protected]" <WIRELESS-LAN@LISTSERV. > EDUCAUSE.EDU> > *Date: *Monday, August 28, 2017 at 7:42 AM > *To: *"[email protected]" <WIRELESS-LAN@LISTSERV. > EDUCAUSE.EDU> > *Subject: *[WIRELESS-LAN] DFS Scans Seem to Have Run Amok > > > > We are a Cisco shop running 8510 HA WLCs and a variety of AP including > 1142s, 2702s, others in smaller quantities for a current total of 6600+ > APs. We are running WLC code 8.0.140.16. This was installed on JAN 4. > > > > A couple of months ago we started seeing a lot of DFS scans. This was > several months after our last code upgrade. When these scans are done, the > users of the 5 GHz radio that is doing the scanning for a clear frequency > are all kicked off of their connections. Since the scans lasts for 1 minute > & 2 seconds, this is very disruptive to the clients. We do not understand > why this behavior has suddenly started all over campus. We are not > particularly near an airport. There in one on the other side of town but it > does not handle commercial service – private planes only plus an occasional > charter for a sporting event. And, the APs that do the most frequent DFS > scans are located in interior rooms, often on the ground floor of a > multistory building. APs located near windows are rarely affected. This is > happening in a lot of buildings, and not just in buildings that may tend to > have noise in the 5 GHz range (e.g., an engineering building). > > > > Has anyone else seen this problem? And, have you found the cause of this > behavior. And, more importantly, a fix for the problem. > > > > Following is an example from one AP (BRU-202-E2) showing two DSF scans > almost back-to-back (2 sec gap) which lasted 3+ minutes: > > > > *Aug 28 04:15:52.930: %DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency > 5540 MHz > > *Aug 28 04:15:53.708: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state > to down > > *Aug 28 04:15:53.710: %LINK-5-CHANGED: Interface Dot11Radio1, changed > state to reset > > *Aug 28 04:15:54.707: %LINEPROTO-5-UPDOWN: Line protocol on Interface > Dot11Radio1, changed state to down > > *Aug 28 04:15:54.739: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state > to up > > *Aug 28 04:15:55.739: %LINEPROTO-5-UPDOWN: Line protocol on Interface > Dot11Radio1, changed state to up > > *Aug 28 04:17:53.253: %DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency > 5280 MHz > > *Aug 28 04:17:54.747: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state > to down > > *Aug 28 04:17:54.750: %LINK-5-CHANGED: Interface Dot11Radio1, changed > state to reset > > *Aug 28 04:17:55.747: %LINEPROTO-5-UPDOWN: Line protocol on Interface > Dot11Radio1, changed state to down > > *Aug 28 04:17:55.773: %DOT11-6-DFS_SCAN_START: DFS: Scanning frequency > 5300 MHz for 60 seconds. > > *Aug 28 04:17:55.774: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state > to up > > *Aug 28 04:17:56.774: %LINEPROTO-5-UPDOWN: Line protocol on Interface > Dot11Radio1, changed state to up > > *Aug 28 04:18:57.382: %DOT11-6-DFS_SCAN_COMPLETE: DFS scan complete on > frequency 5300 MHz > > > > > > THANKS. > > > > > > *John Watters* > > Network Engineer, Office of Information Technology > > The University of Alabama <https://www.ua.edu/> > A115 Gordon Palmer Hall > Box 870346 > Tuscaloosa, AL 35487 > Phone 205-348-3992 > [email protected] > > [image: he University of Alabama] <https://www.ua.edu/> > > > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at http://www.educause.edu/ > discuss. > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at http://www.educause.edu/ > discuss. > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at http://www.educause.edu/ > discuss. > > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
