My understanding was that it worked based on the MM's knowledge of which APs are neighbors, not based strictly on channels. This may have changed.
For what it's worth, they did a live upgrade during the keynote at Airheads. From the client's view, it seemed seamless. It's worth noting that a large auditorium is an ideal location for this, due to a lot of overlapping coverage. If you have a one-off office with a single AP, there will be ~2 minute outage when the AP reboots. Disclaimer: I haven't gotten any road time with 8.x outside of a lab, yet. -- Jonathan Waldrep Network Engineer Network Infrastructure and Services Virginia Tech On Thu, Jun 8, 2017 at 4:49 PM, Harris, Robert <robert.har...@culinary.edu> wrote: > What he said, basically it’s a “client aware” option for AP upgrades.. > > > > > > > *Robert Harris **Manager of Network Services* > > *Culinary Institute of America* > > 1946 Campus Drive > > Hyde Park, NY > 845-451-1681 <(845)%20451-1681> > > www.ciachef.edu > > *Food is Life* > > *Create and Savor Yours.™* > > > > *Please consider the environment before printing this e-mail.* > > > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto: > WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Samuel Clements > *Sent:* Thursday, June 8, 2017 4:46 PM > *To:* The EDUCAUSE Wireless Issues Constituent Group Listserv < > WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>; Harris, Robert < > robert.har...@culinary.edu> > *Subject:* Re: [WIRELESS-LAN] ArubaOS 8.X Experiences > > > > At AirHeads it was described this way: > > > > Code is loaded on one WLC, WLC is rebooted and running new code. > > Client match is used to encourage clients to leave APs on a selected > channel. > > All APs on that selected channel are elected for update and moved to the > WLC with the new code. > > Moved APs get new code, reboot, come back into service. > > APs running new code are eligible for taking on new clients and client > match should start moving clients to the new code APs. > > Lather, rinse, repeat until all channels have been rotated through. > > Once the WLC is unloaded, it gets new code and is rebooted. > > > > So, not really 'hitless' as advertised, but yes- far better than taking > them all out at once. Assuming of course that client match successfully > behaves. ;-) > > -Sam > > > > > > > > On Thu, Jun 8, 2017 at 3:38 PM, Joachim Tingvold <joac...@tingvold.com> > wrote: > > On 8 Jun 2017, at 19:11, Sweetser, Frank E wrote: > > […] and from there I'm really looking forward to seeing how well the live > upgrades work! > > > Hi, > > Do you know how that works in detail? All I can find is the sales > mumbo-jumbo that over-promises (as usual); "[…] allows customers to upgrade > their wireless network in real time without any impact to user > connectivity. Upgrade process is simplified, no maintenance downtime […]". > > Looking at the installation manual of 8.1.0, it doesn't say how it's done, > but I managed to find a "dumbed down" non-official explanation that went > something along the lines of "[…] move all APs to secondary controller, > then upgrade the primary controller. After primary is upgraded, APs are > gradually upgraded/moved to the primary controller (i.e. not all at once). > Once all APs is upgraded, the secondary controller is upgraded, and then > the redundancy is restored". > > How are those APs selected? Just random order? If so, that doesn't really > mean "no downtime" or "no impact on users", as you could risk neighboring > APs to be upgraded at the same time, causing smaller or larger blindspots. > Of course it sounds better than to "take it all down", but, yeah, not > really ISSU… > > -- > Joachim > > > > ********** > 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.
