Thanks Jeff, Yes, disabling the 'remember networks' option, I now see it prefers the 2.4G signal.
> If you want the Macs to stick with 5G, then you'll need to create a > different SSID from the 2.4G e.g. main-a, main-g so that it will always > be on 5G. Actually I found out that Cisco has a feature that will selectively prefer probe requests from dual band clients to help persuade clients to one radio or the other. I've yet to test it but appears in 6.0.182 via CLI as 'config band-select' and can be enabled on a per-WLAN basis which I found also mentioned here: http://www.cisco.com/en/US/solutions/collateral/ns340/ns394/ns348/ns767/farp ointWLAN_strategies_wp.pdf -- > -----Original Message----- > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:[email protected]] On Behalf Of Jeffrey > Sessler > Sent: Tuesday, November 03, 2009 2:48 PM > To: [email protected] > Subject: Re: [WIRELESS-LAN] MAC - Cisco DTPC > > Garry, > > It's world-mode (config 802.11a world-mode) and not DTPC (config > 802.11a dtpc) that influenced the Mac client power bug on 5G, but the > point is correct that the latest 5.2 (which has a controller setting > now for world-mode) and 6.0 (does not have the setting) seem to have > resolved the issue so the need to disable world-mode is no longer > needed. > > The Mac initially prefers the 2.4G radio over 5G (given same SSID) > unless the RSSI is compelling enough for it to do otherwise, and this > is unlikely if the source of the two are from the same AP. I have > however noticed that our Macs in the residential halls will transition > from 2.4G to 5G if they've been stationary for a certain amount of > time, and may suggest that there is some logic behind the scenes. That > said, if "remember networks" is enabled, and say a Mac Laptop was last > on a 5G radio when put to sleep, it does seem to attempt a connection > to 5G when awaken. > > You can influence the Mac's behavior by modifying the pref's file, and > removing all 2.4G references and including just 5G information. > Unfortunately, once it connects to 5G and scans again, it will insert > the 2.4G information it finds back into the prefs file. > > If you want the Macs to stick with 5G, then you'll need to create a > different SSID from the 2.4G e.g. main-a, main-g so that it will always > be on 5G. > > Jeff > > >>> Garry Peirce <[email protected]> 11/2/2009 8:47 AM >>> > To follow up on a previous posting, I'd heard back from Cisco re: > world-mode/DTPC. The SE had inquired with the system engineering > group. > They reported that they had not experienced any issues with MAC clients > since they upgraded to the latest release of 5.2. They have therefore > left > DTPC at default. Which is how I have left it although I run 6.0.182. > > In that thread, there was also talk of an Apple/Broadcom driver bug. > Reviewing that, it looks to me like there may still be an issue in > selecting > an available 5G radio. > > I have a Mac running 10.5.7 using a Broadcom based card w/driver > 50.10.38.35. > If I disable my 5G radio on a Cisco LW AP (1142 running 6.0.182), the > client > immediately re-associates to the 2.4G radio. When I re-enable the 5G > radio, the Mac remains connected to the 2.4G service. > I have to disable/re-enable the Mac's Airport card to regain > connectivity to > it where it will then immediately connect (bonding channels 64/63 and > using > the 800ns SGI). > > The plist file does appear to record the 2.4G channel used but not 5G > channels. > Does anyone know if this is an intended behavior or if the Mac should > prefer > the 5G over 2.4G radio? > > > -- > > > > > > -----Original Message----- > > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > > [mailto:[email protected]] On Behalf Of Garry Peirce > > Sent: Thursday, October 15, 2009 5:11 PM > > To: [email protected] > > Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs > > > > Perhaps I was erroneous in equating the two through a Cisco doc > > referencing > > DTPC to world-mode. > > 'When you enable Dynamic Transmit Power Control (DTPC), access points > > add > > channel and transmit power information to beacons. (On access points > > that > > run Cisco IOS software, this feature is called world mode.)' > > > > DTPC does appear to be CCX related, so it is likely irrelevant with > > regard > > to the mentioned Apple/Broadcom bug. > > > > Running 6.0.182, > > 'config 802.11a world-mode' is not an available option. > > 'config 802.11a dtpc' is. > > 'show 802.11a' will show the status of DTPC. > > > > I'll inquire w/Cisco. > > > > > > -- > > > > > > > > > > > -----Original Message----- > > > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > > > [mailto:[email protected]] On Behalf Of Matt > Grover > > > Sent: Thursday, October 15, 2009 2:51 PM > > > To: [email protected] > > > Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs > > > > > > It's under: > > > > > > show 802.11a(or b) > > > > > > -Matt > > > > > > Bob Richman wrote: > > > > So, how about the show command that displays the current setting? > > > > > > > > -----Original Message----- > > > > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > > > [mailto:[email protected]] On Behalf Of Matt > Grover > > > > Sent: Thursday, October 15, 2009 1:21 PM > > > > To: [email protected] > > > > Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs > > > > > > > > Actually, if you are talking about specifically "world-mode" it's > > > under: > > > > > > > > CLI: config 802.11a world-mode > > > > or config 802.11b world-mode > > > > > > > > -Matt > > > > > > > > > > > > > -- > > > ------------------------------------------------------------ > > > Matt Grover === University of Florida > > > Sr. Network Engineer === http://net-services.ufl.edu > > > [email protected] === Florida Lambda Rail > > > (352)273-1061 === http://www.flrnet.org/ > > > ------------------------------------------------------------ > > > > > > ********** > > > 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/.
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