To follow up, Cisco TAC have put our problem down to the bug ID I mentioned below. Their advice was to use the workaround of disabling DMS 11v option from the WLAN. They also advised disabling MU-MIMO. We disabled DMS 11v, but we were certainly not going to disable MU-MIMO! From our initial investigations it looks like disabling DMS 11v has solved the issue (but its early days) and we are told this bug will be fixed in 8.10.150
From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Lee H Badman <000000db5b77bd95-dmarc-requ...@listserv.educause.edu> Date: Wednesday, 2 June 2021 at 16:30 To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [EXTERNAL] [WIRELESS-LAN] Cisco 8540 Code Recommendation, Based on Stability? That one’s interesting because it shows affected code is 8.5(140.0), and only one case... is TAC agreeing it’s the same bug? Just curious. Lee Badman (mobile) On Jun 2, 2021, at 11:23 AM, Jonathan Oakden <j.p.oak...@lboro.ac.uk> wrote: We are on 8.10.151 for the last couple of months here at Loughborough University in England. We think we are being hit quite badly by this bug: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp31778 with around 6% of our 2802i APs being currently affected. It’s a really annoying bug too as to the user they appear to be connected to Wi-Fi but they have no network activity at all. Also the APs seem fine from a monitoring perspective unless you are either carefully monitoring their memory usage, or they get so far out of memory that they appear to lose their registration with the controller. As such, I really can’t recommend 8.10.151. From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Lee H Badman <000000db5b77bd95-dmarc-requ...@listserv.educause.edu> Date: Wednesday, 2 June 2021 at 16:06 To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] [EXTERNAL] [WIRELESS-LAN] Cisco 8540 Code Recommendation, Based on Stability? Thanks, Jason and Dennis. Lee Badman | Network Architect (CWNE#200) Information Technology Services (NDD Group) 206 Machinery Hall 120 Smith Drive Syracuse, New York 13244 t 315.443.3003 e lhbad...@syr.edu<mailto:lhbad...@syr.edu> w its.syr.edu Campus Wireless Policy: https://answers.syr.edu/display/network/Wireless+Network+and+Systems SYRACUSE UNIVERSITY syr.edu From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> On Behalf Of Jason Mallon Sent: Wednesday, June 2, 2021 10:58 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] [EXTERNAL] [WIRELESS-LAN] Cisco 8540 Code Recommendation, Based on Stability? We are currently running 8.10.151 and have been for quite a few months with no issues as of yet. Only two issues as of right now are a certain devices not being able to connect, working with TAC on those. 8.10.130 and 8.10.142 are covered in bugs. Thanks, Jason Mallon | Network Engineer III <image001.png> OIT The University of Alabama <https://www.ua.edu/>jemal...@ua.edu<mailto:jemal...@ua.edu> <image001.png> From: The EDUCAUSE Wireless Issues Community Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> on behalf of Lee H Badman <000000db5b77bd95-dmarc-requ...@listserv.educause.edu<mailto:000000db5b77bd95-dmarc-requ...@listserv.educause.edu>> Date: Wednesday, June 2, 2021 at 9:40 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> Subject: [EXTERNAL] [WIRELESS-LAN] Cisco 8540 Code Recommendation, Based on Stability? Hi all, After a tumultuous series of code versions, awhile back we settled on 8.5.151.0 and hung on to it like grim death because it was very, very reliable. Given that 8.5 code goes end-of-support at end of 2021, combined with latest rounds of announced vulnerabilities, I’m looking for recommendations in the 8.10 train based on wanting stability above all. We have 3800s and 3700s currently, likely to stay that way through the next academic year. Has anyone found an 8.10. code version for the 8540 that supports the 3700 and 3800 while providing good daily stability? 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