I was going to comment that in 2007 or 2008 when we were choosing between Cisco & Aruba, Cisaco told us that Aruba's band steering was not possible. Now everybody is doing it.
Bruce Osborne Wireless Engineer IT Infrastructure & Media Solutions (434) 592-4229 LIBERTY UNIVERSITY Training Champions for Christ since 1971 -----Original Message----- From: Chuck Enfield [mailto:[email protected]] Sent: Thursday, August 13, 2015 5:25 PM Subject: Re: Exclusive 2.4 Ghz and 5 Ghz SSIDs Thanks. That could be what I was missing. The Cisco systems I get asked to assist with are usually neglected. It's quite likely I wasn't dealing with all the latest features. It's important to know the product in this business, so I'm at a major disadvantage on Cisco. (I humbly request that those of you who know me resist the temptation to comment on just how disadvantaged I am.) -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Jeffrey D. Sessler Sent: Thursday, August 13, 2015 5:07 PM To: [email protected] Subject: Re: [WIRELESS-LAN] Exclusive 2.4 Ghz and 5 Ghz SSIDs On the Cisco, you also have a choice between TPCv1 coverage optimal mode or TPCv2 Interference Optimal. For dense deployments, you really want to be using TPCv2. Jeff On 8/13/15, 1:05 PM, "The EDUCAUSE Wireless Issues Constituent Group Listserv on behalf of James Michael Keller" <[email protected] on behalf of [email protected]> wrote: >On 08/13/2015 03:40 PM, Chuck Enfield wrote: >> Just to be clear, we don’t have to do these things to make wireless >> work. It makes it work better. But it is sometimes necessary to >> make wireless work acceptably in the most challenging environments. >> That said, left to defaults Aruba’s ARM also adjusts 2.4 GHz Tx power >> way down. So far down, in fact, that coverage gaps show up. It also >> tends to keep power higher on busy APs and lower on less busy ones. >> In some cases the power on the 2.4 radio will be the same as the >> power on the 5 GHz radio. These characteristics forces us to >> configure a range of acceptable power levels for ARM to choose from. >> Once you’re doing that, why not select the optimum power levels? >> >> While I’m no expert on Cisco wireless, I have assisted some >> departments with problems on their Cisco infrastructure. Based on >> that limited experience, I have far less confidence in RRM than you seem to. >> > >The main issue is the defaults for Aruba are for coverage networks, not >high density (30-40 ft) or very high density (30 Ft or less). You need >to adjust the coverage index min/ideal for high density deployments so >ARM will power down to Min TX powers without shutting down the 2.4 GHz >radios due to CCI (even with edge detection for the APs the default will >still end up with only a few 2.4 GHz APs). If you set Tx Min/Max to a >6dBm range the APs can power to around double the cell size for >coverage gaps if a radio is down. > >I also like to set the 5 GHz Tx Min/Max range at least 3dBm higher then >2.4 GHz because of the unattenuated propagation distance and better >attenuated penetration. Which also helps duel band devices make better >selections. However most devices have a fairly generous threshold on >AP signal drop before they even try and probe for candidate APs to >associate to. That's really where the controller based client stearing >solutions come in to play with selective acks or the probes to get the >client on the best AP regardless of what the client wants based on just >Rx signal. > >-- > >-James > >********** >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/.
