Interesting- any details on what it amounted to specifically? -Lee
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Walter Reynolds Sent: Thursday, February 19, 2015 3:22 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Looking for testimonials- 8510 vs 5508 WLC reliability We do not have enough APs to say one way or another, but I did get a call from Michigan State saying they were having problems with controller response at about 3,000 APs ------------------------ Walter Reynolds Principal Systems Security Development Engineer Information and Technology Services University of Michigan (734) 615-9438 On Thu, Feb 19, 2015 at 3:16 PM, Kitri Waterman <ki...@uoregon.edu<mailto:ki...@uoregon.edu>> wrote: Matt, You mentioned "10 min for full HA convergence" which seems long. But then again, we've also seen a consistent issue where during an HA event the configs are reported as "out of sync" and the secondary controller has to reboot, sometimes more than once to re-sync. My current theory is that very dynamic parts of the configs like rogue adhoc alerts should be left out of the controller XML sync check and this would enable faster HA pairing. Kitri Waterman -- Network Engineer (Wireless) University of Oregon On 2/19/15 11:58 AM, Williams, Matthew wrote: So far for us, I the benefits outweigh the risks. In our case, when we failed one route engine the 8510s simply failed over to the HA box and there was no perceivable degradation in the user experience. Our issues with using Layer-2 for the HA only occurred if BOTH of our upstream switches had a routing engine failure within the 10 minutes it takes for the full HA convergence time. The odds of that happening at the same time are extremely remote and would most likely indicate a much larger networking issue that would trump a wireless outage. We chose to do the direct connection just to be extra safe. In fact, the only reason we even found out about the routing engine issue was because we replaced routing engines in each of our upstream switches at roughly the same time. I don’t know how much testing you have done with the 8510s but we’ve run them through some pretty good paces. Respectfully, Matthew Williams IT Manager, Wireless Kent State University Office: (330) 672-7246<tel:%28330%29%20672-7246> Mobile: (330) 469-0445<tel:%28330%29%20469-0445> From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Lee H Badman Sent: Thursday, February 19, 2015 2:49 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] Looking for testimonials- 8510 vs 5508 WLC reliability I saw the bowing thing- that’s insane. It makes me curious about the racks they are mounted in. To date, do you see the advantages of the 8510 as outweighing the concerns? From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Williams, Matthew Sent: Thursday, February 19, 2015 2:46 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] Looking for testimonials- 8510 vs 5508 WLC reliability Lee, We’re going through this as we speak. We’ve seen some issues with the controllers physically bowing. We’ve also had issues with running HA via Layer-2 when upstream routing engines/supervisor cards fail. Part of the issue is that there is very limited keep alive timer control in our version of code and the thresholds aren’t high enough to mitigate the route engines switching over. Cisco recommends direct connecting them, so we’ve resorted to using switches as media converters for the direct connection. The good news is that 8.0.100 reintroduced timer controls that did mitigate the failures when using Layer2 for the HA. The bad news is that 8.0.100 caused watchdog failures in the 8510s. Respectfully, Matthew Williams IT Manager, Wireless Kent State University Office: (330) 672-7246<tel:%28330%29%20672-7246> Mobile: (330) 469-0445<tel:%28330%29%20469-0445> From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Lee H Badman Sent: Thursday, February 19, 2015 2:35 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: [WIRELESS-LAN] Looking for testimonials- 8510 vs 5508 WLC reliability One more for the group: Having a large number of 5508s, I have an interest in greatly simplifying the environment by moving to higher capacity 8510s (zero interest in 5760s). I’m hoping to hear from those that have taken the 8510 plunge. For us, outside of code issues, the 5508s have been solid hardware for us. Would like to know whether current 8510 users find them to be reliable as hardware, and whether the HA promises live up to the glossy. Thanks- Lee B. Lee Badman Wireless/Network Architect ITS, Syracuse University 315.443.3003<tel:315.443.3003> (Blog: http://wirednot.wordpress.com) ********** 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/. ********** 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/.
