No problem. The value at which multicasts are no longer converted to unicast (Dynamic Multicast Optimization Threshold).
We have actually set that value to a high value so it is always converted to unicast because. At least early on, there was an issue if this was set too low when using VLan pools. This issue may have been fixed, but we have not tested that. Bruce Osborne Network Engineer IT Network Services (434) 592-4229 LIBERTY UNIVERSITY 40 Years of Training Champions for Christ: 1971-2011 -----Original Message----- From: Brooks, Stan [mailto:stan.bro...@emory.edu] Sent: Thursday, February 23, 2012 12:25 PM Subject: Re: You knew it was coming...Airplay/Apple TV support for instructors. Bruce - I was thinking of your installation when I responded as I was aware of your work with with Aruba to optimize b'cast/m'cast and converting b'cast/m'cast to unicast at the AP. I got the 12 client tradeoff point from something I remember for an Aruba AirHeads conference a couple of years ago. Granted, my memory may be fading, but I remember one of their engineers state that it is effective to do the conversion to unicast per client for up to ~12 clients, and after that, it's better to keep the packets m'cast. Sorry if I mis-spoke on the technology. >>-> Stan Brooks - CWNA/CWSP Emory University University Technology Services 404.727.0226 AIM/Y!/Twitter: WLANstan MSN: wlans...@hotmail.com GoogleTalk: wlans...@gmail.com -----Original Message----- From: "Osborne, Bruce W" <bosbo...@liberty.edu> Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Date: Thu, 23 Feb 2012 17:14:06 +0000 To: <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple TV support for instructors. >Where did you get that 12 client number?? > >At Liberty University, we have successfully had 20 students per AP with >5Mbit streams. In a Lab test situation, we had 30 clients all streaming >on one AP-125 access point. > >Multicast on 802.11 uses the lowest rate which is 6Mbit for 5GHz >networks. That is why Aruba developed their multicast technology. We >have been using it since it was introduced. > >Bruce Osborne >Network Engineer >IT Network Services > >(434) 592-4229 > >LIBERTY UNIVERSITY >40 Years of Training Champions for Christ: 1971-2011 > >-----Original Message----- >From: Brooks, Stan [mailto:stan.bro...@emory.edu] >Sent: Wednesday, February 22, 2012 12:49 PM >Subject: Re: You knew it was coming...Airplay/Apple TV support for >instructors. > >So it's not just about the bandwidth. B'cast & M'cast use the lowest >configured data rate of the AP - just like wireless management frames. >This means that even for 300Mbps 802.11n network is reduced to 24Mbps >or less. That also ties up airtime that could be given to faster >clients as well, since transmitting data at a lower data rate consumes >more time that transmitting data at a higher data rate. > >So even if it is a low bit-rate stream, it takes away more available >bandwidth from other clients. > >Aruba has a method that takes b'cast & m'cast and converts it to higher >speed unicast traffic to each client. This gives better results for >about up to 12 clients on an AP/radio. > >>>-> Stan Brooks - CWNA/CWSP > Emory University > University Technology Services > 404.727.0226 >AIM/Y!/Twitter: WLANstan > MSN: wlans...@hotmail.com > GoogleTalk: wlans...@gmail.com > > > >-----Original Message----- >From: Mike Goebel <michael.goe...@wmich.edu> >Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv ><WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> >Date: Wed, 22 Feb 2012 11:09:16 -0500 >To: <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> >Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple TV >support for instructors. > >>Has anyone actually tracked how much bandwidth/usage Bonjour coughs up >>across their wlan infrastructure? I haven't analyzed it, and while it >>could be bandwidth hungry, it appears to me that will be more with >>device to device. >> >>I'm playing devils advocate here, but is a 6 meg stream on an N access >>point both ways really going to be crunching anyone? I'd be worried >>about G yes, but N with a gig uplink? >> >>I do find it unnerving that all the bonjour devices are able to find >>each other and potentially create a lot of traffic, but 99.9% of the >>time I don't see anyone working any access point very hard. >> >>Mike Goebel >>Network Programmer >>Office of Information Technology >>Western Michigan University >>Phone: 269-387-0453 >>Email: michael.goe...@wmich.edu >> >>On 2/22/2012 10:18 AM, Kellogg, Brian D. wrote: >>> We will need Bonjour in order to allow faculty members to mirror >>>their iPads/WhateverAppleProductElse to an AppleTV in a classroom for >>>presentations wirelessly. Presently we block all mcast and bcast on >>>our WLAN due to the channel use overhead this incurs (anywhere from >>>10% to 20%). We'll be moving to Aruba this summer where enabling >>>bcast and mcast is not an all or nothing endeavor I believe. I think >>>Aruba is integrating some stuff into their controller code to help >>>with this problem or already has it. Someone who knows more about >>>Aruba can correct me if I'm wrong. >>> >>> -Brian >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Brian David >>> Sent: Wednesday, February 22, 2012 10:11 AM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: You knew it was coming...Airplay/Apple TV support for >>>instructors. >>> >>> We are faced with the same issues here at BC... We are starting to >>>block it for all students but have not for the Faculty. >>> Could you give more details on what apps the faculty needed bonjour >>>for? >>> -Brian >>> >>> Brian J David >>> Network Systems Engineer >>> Boston College >>> >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Brian Helman >>> Sent: Wednesday, February 22, 2012 9:54 AM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple >>>TV support for instructors. >>> >>> Agreed. We are blocking bonjour between buildings, but not within. >>>I wanted to block within, but there are apps out there that the >>>faculty want to use that require it. That was the compromise I >>>settled on... >>>looking forward to 802.11ac now. >>> >>> I thought my days of dealing with AppleTalk, IPX and Netbeui were done. >>> >>> -Brian >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Kellogg, >>>Brian D. >>> Sent: Tuesday, February 21, 2012 5:21 PM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple >>>TV support for instructors. >>> >>> Had an Apple rep in recently and he stated Apple (Bonjour) has come >>>a long way since Appletalk on their network protocols. I wanted to >>>believe him and then I tried to use it on our campus. LAN only >>>protocol that relies on mDNS registration to bridge networks assuming >>>all your end devices support it of course. Reminds me of LAN/SOHO >>>only protocols I worked with a decade ago. Why not allow the device >>>being mirrored to specify the device you want to mirror to by IP >>>address or FQDN. I don't think I'm asking for too much from the man >>>but, alas, perhaps I am. >>> >>> >>> Disappointed yet again by Apple network protocols, Brian >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Lee H Badman >>> Sent: Tuesday, February 21, 2012 4:57 PM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: You knew it was coming...Airplay/Apple TV support for >>>instructors. >>> >>> Would be interesting to contemplate a petition or similar from the >>>Educause members to Apple requesting that they catch up to the fact >>>that their toys are invading the enterprise, that the enterprise >>>doesn't run on AirPorts, and therefor they might develop towards the >>>enterprise WLAN, Then again, I doubt they'd give a rip. >>> >>> It's a shame that the sexiest devices on the planet have such >>>shallow network development behind them. >>> >>> -Lee >>> >>> >>> ________________________________________ >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Cappalli, Tim G @ >>>LSC-ITS [tim.cappa...@lsc.vsc.edu] >>> Sent: Tuesday, February 21, 2012 4:36 PM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple >>>TV support for instructors. >>> >>> It's time for Apple step up. How many hundreds of hours are we going >>>to spend on this? For the first time in a long time, we are saying >>>"no" for the time being. >>> >>> >>> Tim Cappalli, CCNA ACMA | IT Services | (802) 626-6456 >>>> tim.cappa...@lyndonstate.edu | it.lyndonstate.edu >>> >>> PRIVACY& CONFIDENTIALITY NOTICE >>> This message is for the designated recipient only and may contain >>>privileged, confidential, or otherwise private information. If you >>>have received it in error, please notify the sender immediately and >>>delete the original. Any other use of an email received in error is >>>prohibited. >>> >>> Sent from my BlackBerry(r) PlayBook(tm) >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Peter P >>>Morrissey >>> Sent: Tuesday, February 21, 2012 4:14 PM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple >>>TV support for instructors. >>> >>> Isn't it amazing that they actually mention classrooms and >>>conference rooms here, yet the geniuses at Apple probably have no >>>clue about what is really involved? >>> Pete M. >>> >>> -----Original Message----- >>> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >>>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Julian Y Koh >>> Sent: Tuesday, February 21, 2012 4:00 PM >>> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >>> Subject: Re: [WIRELESS-LAN] You knew it was coming...Airplay/Apple >>>TV support for instructors. >>> >>> -----BEGIN PGP SIGNED MESSAGE----- >>> Hash: SHA1 >>> >>> On Fri Dec 16 2011 11:16:43 Central Time, "Johnson, Neil M" wrote: >>>> >>>> We have a request to support Airplay/Apple TV's on our enterprise >>>> network so that instructors can mirror presentations from their >>>> iPad's to classroom and meeting room projectors. >>> >>> This is only going to get more prevalent now that Mountain Lion will >>>support Airplay mirroring from OS X machines. >>> >>> <http://www.apple.com/macosx/mountain-lion/features.html#airplay> >>> >>> Gonna be fun.... >>> >>> - -- >>> Julian Y. Koh<mailto:kohs...@northwestern.edu> >>> Manager, Network Transport<phone:847-467-5780> >>> Telecommunications and Network Services Northwestern University >>> PGP Public >>> Key:<http://bt.ittns.northwestern.edu/julian/pgppubkey.html> >>> >>> -----BEGIN PGP SIGNATURE----- >>> Version: GnuPG/MacGPG2 v2.0.17 (Darwin) >>> Comment: GPGTools - http://gpgtools.org >>> >>> iEYEARECAAYFAk9EBcgACgkQDlQHnMkeAWMf8wCfdfVsWgcll4cqUiIQRL/DClf5 >>> w1IAnjvdC0e34jam3rguhn2fG/kUmm+p >>> =Bd3x >>> -----END PGP SIGNATURE----- >>> >>> ********** >>> 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/. >>> >>> ********** >>> 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/. > > >________________________________ > >This e-mail message (including any attachments) is for the sole use of >the intended recipient(s) and may contain confidential and privileged >information. If the reader of this message is not the intended >recipient, you are hereby notified that any dissemination, distribution >or copying of this message (including any attachments) is strictly prohibited. > >If you have received this message in error, please contact the sender >by reply e-mail message and destroy all copies of the original message >(including attachments). > >********** >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/. ________________________________ This e-mail message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this message (including any attachments) is strictly prohibited. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments). ********** 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/.
